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1. 110th Anniversary: Recent Progress and Future Challenges in Selective Catalytic Reduction of NO by H₂ in the Presence of O₂

Author:
Zhun Hu; Ralph T. Yang
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.24 pp. 10140-10153
ISSN:
1520-5045
Subject:
catalysts; chemical reduction; cobalt; copper; hydrogen; iron; nickel; nitric oxide; oxygen; platinum
Abstract:
... Over the past several years, selective catalytic reduction of NOₓ with hydrogen (H₂-SCR) has been regarded as a promising technology for NOₓ abatement under lean-burn conditions. In this review, we discuss the recent progress in the development and understanding of H₂-SCR catalysts. The various mechanisms that have been proposed in the literature are reviewed first. The influence of the catalyst c ...
DOI:
10.1021/acs.iecr.9b01843

2. A Co–N₄ moiety embedded into graphene as an efficient single-atom-catalyst for NO electrochemical reduction: a computational study

Author:
Zhongxu Wang; Jingxiang Zhao; Jingyang Wang; Carlos R. Cabrera; Zhongfang Chen
Source:
Journal of materials chemistry 2018 v.6 no.17 pp. 7547-7556
ISSN:
2050-7496
Subject:
ammonia; catalysts; density functional theory; electrochemistry; graphene; groundwater; moieties; nitric oxide; nitrous oxide; remediation
Abstract:
... Electrochemical reduction of nitric oxide (NOER) is a promising technology for the removal of harmful N-containing species in groundwater under mild conditions. In this work, by means of density functional theory computations, we systematically investigated the potential of utilizing experimentally feasible transition metal–N₄/graphenes as NOER catalysts. Our results revealed that NO molecules can ...
DOI:
10.1039/c8ta00875b

3. A Cr-phthalocyanine monolayer as a potential catalyst for NO reduction investigated by DFT calculations

Author:
Jittima Meeprasert; Anchalee Junkaew; Nawee Kungwan; Bavornpon Jansang; Supawadee Namuangruk
Source:
RSC advances 2016 v.6 no.25 pp. 20500-20506
ISSN:
2046-2069
Subject:
catalysts; chemical bonding; density functional theory; dissociation; energy; heat production; nitric oxide; nitrogen; nitrous oxide; reaction mechanisms; temperature
Abstract:
... The reaction mechanism of nitric oxide (NO) reduction to nitrous oxide (N₂O) and N₂ catalyzed by a Cr-phthalocyanine sheet (CrPc) was investigated using periodic density functional theory (DFT). The results show that direct NO dissociation on the catalyst is inhibited by a large energy barrier owing to the difficulty of direct cleavage of the strong NO bond. The dimer mechanism in which two NO mol ...
DOI:
10.1039/c5ra25631c

4. A Unique Fe/Beta@TiO2 Core–Shell Catalyst by Small-Grain Molecular Sieve as the Core and TiO2 Nanosize Thin Film as the Shell for the Removal of NOx

Author:
Jixing Liu; Jian Liu; Zhen Zhao; Yuechang Wei; Weiyu Song; Jianmei Li; Xiao Zhang
Source:
Industrial & engineering chemistry process design and development 2017 v.56 no.20 pp. 5833-5842
ISSN:
1520-5045
Subject:
acrolein; active sites; adsorption; ammonia; catalysts; catalytic activity; iron; iron oxides; nanoparticles; nitrates; nitric oxide; nitrogen dioxide; oxidation; process design; propylene; temperature; thermal stability; titanium dioxide
Abstract:
... Fe/Beta@TiO₂ core–shell catalysts with nanosize TiO₂ thin film as the shell and small-grain Beta supporting Fe oxides as the core were controllably synthesized by a self-assembly method, and their catalytic performances were investigated for selective catalytic reduction of NOₓ with NH₃ (NH₃–SCR). It was found that TiO₂ shells decrease the acid amount and weaken the acid strength of the catalyst, ...
DOI:
10.1021/acs.iecr.7b00740

5. A catalyst with the better catalytic activity for NO reduction showed bigger reduction capacity and limiting current

Author:
Yuling Wen; Xiaoli Wang; Wen Shi; Jia Zhang; Jizhi Zhou; Yunfeng Xu; Qiang Liu; Guangren Qian
Source:
Science of the total environment 2020 v.701 pp. 135036
ISSN:
0048-9697
Subject:
catalysts; catalytic activity; electrochemistry; electron transfer; nitric oxide
Abstract:
... The catalytic activity of a new catalyst for NO reduction is usually obtained by a gas-solid phase experiment. For the first time, a relationship has been established between catalytic performance and electrochemistry property. A bimetallic catalyst showed a low-temperature activity and removed 67.27% of NO at 300 °C, 33.39% bigger than a single-metallic catalyst. The bimetallic catalyst removed 9 ...
DOI:
10.1016/j.scitotenv.2019.135036

6. A catalytic reaction scheme for NO reduction by CO over Mn-terminated LaMnO3 perovskite: A DFT study

Author:
Xuchen Yan; Jing Liu; Yingju Yang; Zhen Wang; Ying Zheng
Source:
Fuel processing technology 2021 v.216 pp. 106798
ISSN:
0378-3820
Subject:
activation energy; active sites; carbon dioxide; carbon monoxide; catalysts; catalytic activity; chemical reduction; density functional theory; lanthanum; manganese; nitric oxide; nitrous oxide
Abstract:
... LaMnO₃ perovskite has been regarded as a promising catalyst for the selective catalytic reduction of NOₓ with CO. The relationship between the active sites and CO-SCR activity of LaMnO₃ perovskite was investigated through density functional theory calculations. All possible reaction steps were proposed to comprehend the CO-SCR catalytic mechanism of NO on LaMnO₃ catalyst. The results show that the ...
DOI:
10.1016/j.fuproc.2021.106798

7. A comparative study of MOx (M = Mn, Co and Cu) modifications over CePO4 catalysts for selective catalytic reduction of NO with NH3

Author:
Cheng Liu; Fei Li; Jing Wu; Xin Hou; Wei Huang; Yong Zhang; Xiangguang Yang
Source:
Journal of hazardous materials 2019 v.363 pp. 439-446
ISSN:
0304-3894
Subject:
ammonia; ammonium; catalysts; cobalt; copper; copper nanoparticles; manganese; manganese oxides; nitrates; nitric oxide; nitrogen dioxide; oxidation; oxygen; scanning electron microscopy; synergism; temperature; transmission electron microscopy
Abstract:
... The MOx (M = Cu, Mn, Co)/CePO4 support was firstly prepared via the hydrothermal and impregnated method. Selective catalytic reduction of NO with NH3 (NH3-SCR) results showed that the MnOx modifications greatly improved the SCR activities at low temperatures. The NOx conversion of the MnOx/CePO4 catalyst was above 80% even at 180 °C. In-situ DRIFTS results suggest that the SCR reaction is majorly ...
DOI:
10.1016/j.jhazmat.2018.09.054

8. A comparative study of Mn/CeO2, Mn/ZrO2 and Mn/Ce-ZrO2 for low temperature selective catalytic reduction of NO with NH3 in the presence of SO2 and H2O

Author:
Boxiong Shen; Xiaopeng Zhang; Hongqing Ma; Yan Yao; Ting Liu
Source:
Journal of Environmental Sciences 2013 v.25 pp. 791-800
ISSN:
1001-0742
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; absorption; ammonia; catalysts; ceric oxide; manganese; manganese oxides; nitric oxide; oxygen; sulfur dioxide; surface area; temperature; water
Abstract:
... Ce-ZrO2 is a widely used three-way catalyst support. Because of the large surface area and excellent redox quality, Ce-ZrO2 may have potential application in selective catalytic reduction (SCR) systems. In the present work, Ce-ZrO2 was introduced into a low-temperature SCR system and CeO2 and ZrO2 supports were also introduced to make a contrastive study. Mn/CeO2, Mn/ZrO2 and Mn/Ce-ZrO2 were prepa ...
DOI:
10.1016/S1001-0742(12)60109-0

9. A comparative study of N2O formation during the selective catalytic reduction of NOx with NH3 on zeolite supported Cu catalysts

Author:
Hai-Ying Chen; Zhehao Wei; Marton Kollar; Feng Gao; Yilin Wang; Janos Szanyi; Charles H.F. Peden
Source:
Journal of catalysis 2015 v.329 pp. 490-498
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy; adsorption; ammonia; ammonium nitrate; catalysts; copper; desorption; isotope labeling; nitric oxide; nitrous oxide; oxidation; thermal stability; yields; zeolites
Abstract:
... A comparative study was carried out on a small-pore Cu-CHA and a large-pore Cu-BEA zeolite catalyst to understand the lower N2O formation on small-pore zeolite supported Cu catalysts in the selective catalytic reduction (SCR) of NOx with NH3. On both catalysts, the N2O yield increases with an increase in the NO2/NOx ratios of the feed gas, suggesting N2O formation via the decomposition of NH4NO3. ...
DOI:
10.1016/j.jcat.2015.06.016

10. A comparative study of metal oxide and sulfate catalysts for selective catalytic reduction of NO with NH3

Author:
Lin Zhu; Zhaoping Zhong; Han Yang; Chunhua Wang
Source:
Environmental technology 2017 v.38 no.10 pp. 1285-1294
ISSN:
1479-487X
Subject:
ammonia; catalysts; catalytic activity; copper; environmental technology; nitric oxide; nitrous oxide; sulfates; temperature
Abstract:
... The properties and characteristics of metal oxide and sulfate catalysts with different active elements for selective catalytic reduction of NO with NH ₃ were investigated. Cerium-based oxide catalyst showed the widest temperature window for NO ₓ removal and manganese-based oxide catalyst exhibited the best catalytic performance at low temperature. For all the catalysts, the SCR activities at low t ...
DOI:
10.1080/09593330.2016.1226393

11. A complete reaction mechanism for standard and fast selective catalytic reduction of nitrogen oxides on low coverage VOx/TiO2(001) catalysts

Author:
Logi Arnarson; Hanne Falsig; Søren B. Rasmussen; Jeppe V. Lauritsen; Poul Georg Moses
Source:
Journal of catalysis 2017 v.346 pp. 188-197
ISSN:
0021-9517
Subject:
catalysts; desorption; models; nitric oxide; nitrogen dioxide; oxygen; reaction mechanisms; stoichiometry; temperature; titanium dioxide
Abstract:
... We present a complete catalytic mechanism describing both the Standard and the Fast selective catalytic reduction (SCR) reactions in their correct stoichiometric form on a vanadia titania (anatase 001 facet) based catalyst model. It consists of two cycles, a NO-activation cycle and a Fast SCR cycle that share the same reduction part but use NO+O2 and NO2 respectively for the reoxidation. The stoic ...
DOI:
10.1016/j.jcat.2016.12.017

12. A continuous denitrification technology based on metal-organic framework without using ammonia

Author:
Jiaxing Hong; Haowei Hu; Hui Wu; Mingzhi Zhang; Jia Zhang; Wangsheng Kong; Qing Lu; Chuanhua Li; Guangren Qian
Source:
Journal of cleaner production 2021 v.279 pp. 123685
ISSN:
0959-6526
Subject:
ammonia; benzene; carbon; catalysts; catalytic activity; chemical reduction; coordination polymers; denitrification; electron paramagnetic resonance spectroscopy; flue gas; free radicals; hot water treatment; ligands; nitric oxide; reducing agents; spectrometers
Abstract:
... Ammonia is widely used as the reductant in selective catalytic reduction of nitrogen oxide. However, ammonia slip results in environmental problems. In this work, a metal-organic framework was synthesized and applied in catalytic reduction of nitric oxide without using ammonia. As a result, the catalyst removed 100% of nitric oxide at 400 °C. A two-tube reactor was designed to ensure a continuous ...
DOI:
10.1016/j.jclepro.2020.123685

13. A dechlorination pathway for synthesis of horn shaped carbon nanotubes and its adsorption properties for CO₂, CH₄, CO and N₂

Author:
Sandesh Y. Sawant; Rajesh S. Somani; Hari C. Bajaj; Sangita S. Sharma
Source:
Journal of hazardous materials 2012 v.227-228 no. pp. 317-326
ISSN:
0304-3894
Subject:
adsorption; carbon; carbon dioxide; carbon monoxide; carbon nanotubes; catalysts; copper; dechlorination; methane; nitric oxide; nitrogen; power plants; reducing agents; synthesis gas; temperature; tetrachloroethylene
Abstract:
... Using metallic copper as reductant and tetrachloroethylene as carbon precursor, a simple, low temperature solvothermal method for the synthesis of horn shaped carbon nanotubes is reported. The detail study of reaction parameters such as temperature, time, carbon precursor amount, type and catalyst proportion has been carried out to optimize the conditions wherein that the copper metal (10g) mediat ...
DOI:
10.1016/j.jhazmat.2012.05.062

14. A heterogeneous single Cu catalyst of Cu atoms confined in the spinel lattice of MgAl₂O₄ with good catalytic activity and stability for NO reduction by CO

Author:
Jichun Wu; Yuanzhi Li; Yi Yang; Qian Zhang; Li Yun; Shaowen Wu; Chongyang Zhou; Zhongkai Jiang; Xiujian Zhao
Source:
Journal of materials chemistry A 2019 v.7 no.12 pp. 7202-7212
ISSN:
2050-7496
Subject:
activation energy; adsorption; carbon monoxide; catalysts; catalytic activity; copper; durability; nitric oxide; nitrogen; nitrous oxide; oxidation; oxygen; temperature
Abstract:
... A heterogeneous single Cu catalyst of Cu atoms confined in the spinel lattice of MgAl₂O₄ (Cu₁-MgAl₂O₄) was prepared by a facile method. Cu₁-MgAl₂O₄ exhibits catalytic activity for NO reduction by CO that is much higher than that of 1.0 wt% Pt/CeO₂. Moreover, Cu₁-MgAl₂O₄ exhibits good catalytic stability at high reaction temperatures up to 700 °C during the long-term durability tests. The good stab ...
DOI:
10.1039/c8ta11528a

15. A highly efficient silver niobium alumina catalyst for the selective catalytic reduction of NO by n-decane

Author:
Carolina Petitto; Hubert P. Mutin; Gérard Delahay
Source:
Chemical communications 2011 v.47 no.38 pp. 10728-10730
ISSN:
1364-548X
Subject:
aluminum oxide; catalysts; catalytic activity; chemical communication; chemical reduction; hydrocarbons; niobium; nitric oxide; silver; sol-gel processing
Abstract:
... AgNb/Al₂O₃ prepared by a nonhydrolytic sol–gel process is a highly efficient catalyst for NOₓ removal through selective catalytic reduction by hydrocarbons (HC-SCR). This result shows that the HC-SCR process remains a challenging method for lean engine DeNOₓ. ...
DOI:
10.1039/c1cc12792f

16. A modelling study and optimization of catalytic reduction of NO over CeO2–MnOx (0.25)–Ba mixed oxide catalyst using design of experiments

Author:
Seyed Mahdi Mousavi; Dariush Salari; Aligholi Niaei; Parvaneh Nakhostin Panahi; Sirous Shafiei
Source:
Environmental technology 2014 v.35 no.5 pp. 581-589
ISSN:
1479-487X
Subject:
adverse effects; ammonia; catalysts; catalytic activity; environmental technology; experimental design; models; nitric oxide; response surface methodology; temperature
Abstract:
... In this study, the effects of operation variables on catalytic performance of CeO ₂–MnO ₓ (0.25)–Ba mixed oxide in catalytic reduction of NO with ammonia are investigated by using design of experiments. A response surface methodology (RSM) combined with the central composite design (CCD) is used to model and optimize the process variables, including concentration of O ₂ (vol.%), NH ₃/NO ratio in t ...
DOI:
10.1080/09593330.2013.837964

17. A new 3DOM Ce-Fe-Ti material for simultaneously catalytic removal of PM and NOx from diesel engines

Author:
Ying Cheng; Jian Liu; Zhen Zhao; Weiyu Song; Yuechang Wei
Source:
Journal of hazardous materials 2018 v.342 pp. 317-325
ISSN:
0304-3894
Subject:
active sites; carbon dioxide; catalysts; catalytic activity; combustion; cost effectiveness; diesel engines; nitric oxide; particulates; soot; temperature
Abstract:
... A new 3DOM material was designed and synthesized for the simultaneous removal of PM (soot particulates) and NOx from diesel engine exhausts. The catalytic purification taking place over the material with double efficacy is cost-efficient. The contact between solid PM and catalyst active site has been process intensified by 3DOM unique structure. 3DOM Ce₀.₇Fe₀.₂Ti₀.₁O₂ catalyst possess a high SCR a ...
DOI:
10.1016/j.jhazmat.2017.08.040

18. A new route to the shape-controlled synthesis of nano-sized γ-alumina and Ag/γ-alumina for selective catalytic reduction of NO in the presence of propene

Author:
Driss Mrabet; Manh-Hiep Vu; Serge Kaliaguine; Trong-On Do
Source:
Journal of Colloid And Interface Science 2017 v.485 pp. 144-151
ISSN:
0021-9797
Subject:
X-ray diffraction; aluminum oxide; catalysts; catalytic activity; nanocrystals; nanoparticles; nanorods; nanospheres; nitric acid; nitric oxide; oxygen; porosity; propylene; silver; surface area; synergism; synthesis; temperature
Abstract:
... We report a new route for the direct synthesis of γ-alumina nanocrystals with size and shape control in the presence of oleylamine as the capping agent. Their morphology can be controlled from nanospheres to nanorods by simply tuning a proper amount of concentrated nitric acid (67%) in the synthetic mixture. The as-made nanoparticle products after calcination show γ-alumina nano-size with unique p ...
DOI:
10.1016/j.jcis.2016.09.021

19. A new view on the relations between tungsten and vanadium in V₂O₅WO₃/TiO₂ catalysts for the selective reduction of NO with NH₃

Author:
Patrick G.W.A. Kompio; Angelika Brückner; Frank Hipler; Gerhard Auer; Elke Löffler; Wolfgang Grünert
Source:
Journal of catalysis 2012 v.286 no. pp. 237-247
ISSN:
0021-9517
Subject:
X-ray diffraction; ammonia; catalysts; electron paramagnetic resonance spectroscopy; mixing; nitric oxide; nitrogen; surface area; titanium dioxide; tungsten oxide; vanadium
Abstract:
... The relation between tungsten and vanadium oxide species in V₂O₅WO₃/TiO₂ catalysts for the selective catalytic reduction of nitrogen oxides by ammonia was studied with two series of catalysts containing 0.5–5wt.% V₂O₅ and 0 or 10wt.% WO₃ impregnated onto a high surface-area titania hydrate of anatase structure to keep theoretical surface coverages of the transition metal oxides ⩽1. The catalysts, ...
DOI:
10.1016/j.jcat.2011.11.008

20. A novel CuTi-containing catalyst derived from hydrotalcite-like compounds for selective catalytic reduction of NO with C3H6 under lean-burn conditions

Author:
Deling Yuan; Xinyong Li; Qidong Zhao; Jijun Zhao; Moses Tadé; Shaomin Liu
Source:
Journal of catalysis 2014 v.309 pp. 268-279
ISSN:
0021-9517
Subject:
Lewis acids; acetates; adsorption; catalysts; catalytic activity; cupric oxide; formates; nitrates; nitric oxide; nitrogen; oxygen
Abstract:
... A series of hydrotalcite-based CuxTi1 (x=2, 3, 4, 5)-mixed oxide catalysts have been synthesized by homogeneous precipitation and tested in the selective catalytic reduction (SCR) of NO by C3H6 in the presence of excess oxygen. Cu atoms can be categorized into surface and bulk species. The surface Cu species are the active sites while the bulk Cu species possess adsorption property for nitrogen sp ...
DOI:
10.1016/j.jcat.2013.09.010

21. A novel catalytic oxidation process for removing elemental mercury by using diperiodatoargentate(III) in the catalysis of trace ruthenium(III)

Author:
Yi Zhao; Meng Qi; Runlong Hao; Jiajun Jiang; Bo Yuan
Source:
Journal of hazardous materials 2020 v.381 pp. 120964
ISSN:
0304-3894
Subject:
catalysts; catalytic activity; cold; flue gas; fluorescence; mercury; nitric oxide; oxidants; oxidation; pH; ruthenium; silver; spectrometers; spectrophotometers; sulfur dioxide; temperature; vapors
Abstract:
... A series of experiments were conducted at a bench scale reactor to investigate the effects of key influencing factors on the Hg0 removal from flue gas using the prepared diperiodatoargentate (III) (DPA) as an oxidant, trace ruthenium(III) as a catalyst, respectively. The experimental results showed that the average Hg0 removal efficiency reached to 87.5% under the optimal conditions in which the D ...
DOI:
10.1016/j.jhazmat.2019.120964

22. A novel chromic oxide catalyst for NO oxidation at ambient temperature

Author:
Shuang Liu; Mintao Zhang; Yanqiang Huang; Kunfeng Zhao; Zhenyuan Gao; Meijian Wu; Yamei Dong; Ting Wang; Jianlin Shi; Dannong He
Source:
RSC advances 2014 v.4 no.55 pp. 29180-29186
ISSN:
2046-2069
Subject:
Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; activated carbon; alkali treatment; ambient temperature; ammonia; carbon fibers; catalysts; catalytic activity; chromic oxide; durability; moieties; nitric oxide; nitrogen dioxide; oxidation; thermogravimetry; transmission electron microscopy
Abstract:
... Chromic oxide catalysts were prepared by ammonia precipitation method and first used in NO oxidation to NO₂ at ambient temperature. After calcination at 300 °C, the catalyst exhibited higher catalytic activity with 100% conversion of NO and significantly longer lifetime than activated carbon or activated carbon fiber that has been reported so far. The effects of crystalline phases and surface hydr ...
DOI:
10.1039/c4ra02681k

23. A novel co-precipitation method for preparation of Mn–Ce/TiO2 composites for NOx reduction with NH3 at low temperature

Author:
Zhongyi Sheng; Yufeng Hu; Jianming Xue; Xiaoming Wang; Weiping Liao
Source:
Environmental technology 2012 v.33 no.21 pp. 2421-2428
ISSN:
1479-487X
Subject:
active oxygen species; ammonia; catalysts; coprecipitation; desorption; environmental technology; methodology; nitric oxide; sulfur dioxide; temperature
Abstract:
... Mn–Ce/TiO₂ catalyst prepared by a novel co-precipitation method was used in this study for low-temperature selective catalytic reduction (SCR) of NOx with ammonia. The catalyst showed high activity and good SO₂ resistance. The NO conversion on the catalyst increased to 100% when 700 ppm of SO₂ flowed in, and reached 60.8% in 2.5 h. The characterized results indicated that the catalyst prepared by ...
DOI:
10.1080/09593330.2012.671370

24. A novel low‐temperature NO removal approach with •OH from catalytic decomposition of H2O2 over La1‐ xCaxFeO3 oxides

Author:
Bo Wu; Yuanquan Xiong
Source:
Journal of chemical technology and biotechnology 2018 v.93 no.1 pp. 43-53
ISSN:
0268-2575
Subject:
boilers; calcium; catalysts; catalytic activity; flue gas; hydrogen peroxide; hydroxyl radicals; moieties; nitric acid; nitric oxide; nitrogen dioxide; oxidation; oxygen; stoichiometry; surface area; temperature
Abstract:
... BACKGROUND: In industrial boilers, the flue gas temperature was below 200°C. The activated temperatures of conventional NO removal approach such as SCR was over 300°C, limiting its application in industrial boilers. In this study, a novel low‐temperature NO removal approach with hydroxyl radicals (•OH) from catalytic decomposition of H₂O₂ over La₁‐ ₓCaₓFeO₃ oxides (x = 0, 0.1, 0.3 and 0.5) was pro ...
DOI:
10.1002/jctb.5317

25. A novel method of microwave heating mixed liquid-assisted regeneration of V2O5–WO3/TiO2 commercial SCR catalysts

Author:
Kunzan Qiu; Jin Song; Hao Song; Xiang Gao; Zhongyang Luo; Kefa Cen
Source:
Environmental geochemistry and health 2015 v.37 no.5 pp. 905-914
ISSN:
0269-4042
Subject:
catalysts; catalytic activity; drying; ethanol; evaporation; heat; industrial applications; microwave treatment; nitric oxide; surface area; vanadium; washing
Abstract:
... An experimental study on the regeneration of deactivated SCR catalysts was carried out using a microwave-assisted method containing three steps of washing with mixed liquid of ethanol and water, impregnating, and drying. After the regeneration treatment, NO conversion at 320 °C increased from 39 to 90 % and vanadium content increased by 62.2 %, which were much higher than those regenerated by the ...
DOI:
10.1007/s10653-014-9663-y

26. A plasma thermal slag-derived from hazardous waste has a born hydrothermal stability

Author:
Jin Zhang; Jiachen Zeng; Jianzhong Wu; Yang Yue; Jia Zhang; Guangren Qian
Source:
Journal of hazardous materials 2021 v.401 pp. 123444
ISSN:
0304-3894
Subject:
Lewis acids; catalysts; hazardous waste; hot water treatment; industry; nitric oxide; slags
Abstract:
... Hydrothermal instability restricts performances of silica-based catalysts, which have wide applications in both industry and environment. For the first time, plasma-thermal slag was revealed to be a catalyst with a born hydrothermal stability in selective catalytic reduction of nitric oxide. The slag catalyst removed 98.5 % of NO with a high N₂ selectivity (> 95 %) at 200 °C. After a hydrothermal ...
DOI:
10.1016/j.jhazmat.2020.123444

27. A plasma-assisted catalytic system for NO removal over CuCe/ZSM-5 catalysts at ambient temperature

Author:
Tao Wang; Hanzi Liu; Xinyu Zhang; Yonghong Guo; Yongsheng Zhang; Yang Wang; Baomin Sun
Source:
Fuel processing technology 2017 v.158 pp. 199-205
ISSN:
0378-3820
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; ambient temperature; catalysts; copper; energy density; nitric oxide; nitrogen dioxide; oxidation; oxygen; thermal stability
Abstract:
... A series of CuCe catalysts were prepared by an incipient-wetness impregnation method for selective catalytic reduction of NO in combination with dielectric barrier discharge plasma. The effect of the Cu/Ce mass ratio on NO and NOx (NO+NO2) removal efficiency has been studied as a function of energy density at ambient temperature. The catalyst samples were characterised by BET, XRD, XPS, H2-TPR and ...
DOI:
10.1016/j.fuproc.2017.01.011

28. A promising catalytic solution of NO reduction by CO using g-C3N4/TiO2: A DFT study

Author:
Yuehong Ren; Qingzhen Han; Jie Yang; Yuehong Zhao; Yongbing Xie; Hao Wen; Zhaotan Jiang
Source:
Journal of colloid and interface science 2022 v.610 pp. 152-163
ISSN:
0021-9797
Subject:
absorption; carbon dioxide; carbon monoxide; carbon nitride; catalysts; density functional theory; desorption; dissociation; graphene; nitric oxide; photocatalysis; titanium dioxide
Abstract:
... The direct catalytic reduction of nitric oxide (NO) by carbon monoxide (CO) to form harmless N₂ and CO₂ is an ideal strategy to simultaneously remove both these hazardous gases. To investigate the feasibility of using graphitic carbon nitride/titanium dioxide (g-C₃N₄/TiO₂) to catalyze the NO reduction by CO, we systematically explore the effect of the interfacial coupling between g-C₃N₄ and TiO₂ o ...
DOI:
10.1016/j.jcis.2021.12.034

29. A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOₓ with NH₃: reaction mechanism and catalyst deactivation

Author:
Shengen Zhang; Bolin Zhang; Bo Liu; Shuailing Sun
Source:
RSC advances 2017 v.7 no.42 pp. 26226-26242
ISSN:
2046-2069
Subject:
active sites; adsorption; ammonia; ammonium sulfate; catalysts; fly ash; heavy metals; manganese; manganese oxides; metal ions; nitric oxide; nitrous oxide; oxidation; pollutants; reaction mechanisms; sulfur dioxide; sulfur oxides; temperature; water vapor
Abstract:
... Atmospheric pollutants of nitrogen oxides (NOₓ) can be reduced by selective catalytic reduction (SCR). SCR of NOₓ with ammonia (NH₃) at low temperatures has attracted much interest for high nitric oxide (NO) conversion, and this method is dominated by catalysts. Manganese (Mn)-containing oxide catalysts exhibit high activity and selectivity for the unique redox property of manganese oxides (MnOₓ). ...
DOI:
10.1039/c7ra03387g

30. A review of the catalysts used in the reduction of NO by CO for gas purification

Author:
Zhicheng Xu; Yuran Li; Yuting Lin; Tingyu Zhu
Source:
Environmental science and pollution research international 2020 v.27 no.7 pp. 6723-6748
ISSN:
0944-1344
Subject:
additives; adsorption; carbon monoxide; catalysts; catalytic activity; combustion; dissociation; flue gas; industrial applications; nitric oxide; oxygen; physicochemical properties; reaction mechanisms
Abstract:
... The reduction of NO by the CO produced by incomplete combustion in the flue gas can remove CO and NO simultaneously and economically. However, there are some problems and challenges in the industrial application which limit the application of this process. In this work, noble metal catalysts and transition metal catalysts used in the reduction of NO by CO in recent years are systematically reviewe ...
DOI:
10.1007/s11356-019-07469-w

31. A superior Fe-V-Ti catalyst with high activity and SO2 resistance for the selective catalytic reduction of NOx with NH3

Author:
Na Zhu; Wenpo Shan; Zhihua Lian; Yan Zhang; Kuo Liu; Hong He
Source:
Journal of hazardous materials 2020 v.382 pp. 120970
ISSN:
0304-3894
Subject:
Raman spectroscopy; ammonia; catalysts; catalytic activity; coprecipitation; ferric oxide; iron; nitric oxide; reaction mechanisms; sulfur dioxide; temperature; titanium dioxide
Abstract:
... A series of Fe-V-Ti oxide catalysts were prepared by a co-precipitation method, among which the Fe0.1V0.1TiOx catalyst showed the optimal NH3-SCR performance and excellent SO2 resistance. Fe0.1V0.1TiOx achieved > 90% NOx conversion at 225–450 °C under a GHSV of 200,000 h−1. When introducing SO2 and H2O to the SCR reaction for 24 h, the NOx conversion maintained a level above 93% at 250 °C. The Ram ...
DOI:
10.1016/j.jhazmat.2019.120970

32. A superior catalyst for low-temperature NO reduction with NH₃

Author:
Gongshin Qi; Ralph T. Yang
Source:
Chemical communications 2003 v. no.7 pp. 848-849
ISSN:
1364-548X
Subject:
ammonia; catalysts; chemical reactions; nitric oxide; sulfur dioxide
Abstract:
... Mn-Ce mixed-oxide catalyst yields nearly 100% NO conversion at 100–150 °C at a high space velocity of 42,000 h⁻¹. SO₂ and H₂O (at high concentrations) have only slight effects on the activity. ...
DOI:
10.1039/b212725c

33. A “Nitrate Route” for the low temperature “Fast SCR” reaction over a V₂O₅–WO₃/TiO₂ commercial catalyst

Author:
Cristian Ciardelli; Isabella Nova; Enrico Tronconi; Daniel Chatterjee; Brigitte Bandl-Konrad
Source:
Chemical communications 2004 v. no.23 pp. 2718-2719
ISSN:
1364-548X
Subject:
ammonia; ammonium nitrate; catalysts; chemical reactions; nitric oxide; nitrogen dioxide; temperature; titanium dioxide; tungsten oxide
Abstract:
... A novel mechanism is proposed for the Fast SCR reaction of NH₃, NO and NO₂ at low temperature involving the formation of ammonium nitrate as intermediate and its subsequent reaction with NO as the rate determining step. ...
DOI:
10.1039/b411613e

34. Ab Initio Study of the Adsorption of Small Molecules on Stanene

Author:
Chen Xianping; Tan Chunjian; Yang Qun; Meng Ruishen; Liang Qiuhua; Cai Miao; Zhang Shengli; Jiang Junke
Source:
The Journal of Physical Chemistry C 2016 v.120 no.26 pp. 13987-13994
ISSN:
1932-7455
Subject:
adsorption; ammonia; carbon monoxide; catalysts; electrostatic interactions; hydrogen sulfide; nitric oxide; nitrogen dioxide; oxygen; semiconductors
Abstract:
... Recent reports focus on the experimental preparation of metal monolayer-stanene which is a zero-gap semiconductor with buckled honeycomb structure. Owing to the outstanding properties of stanene, its promising applications in nanoelectronics are widely concerned and studied. Using the first-principles calculations, we investigate the adsorption behavior of CO, NH₃, H₂O, H₂S, O₂, NO, and NO₂ molecu ...
DOI:
10.1021/acs.jpcc.6b04481

35. Achieving rational design of alloy catalysts using a descriptor based on a quantitative structure–energy equation

Author:
Yunxuan Ding; Yarong Xu; Yu Mao; Ziyun Wang; P. Hu
Source:
Chemical communications 2020 v.56 no.21 pp. 3214-3217
ISSN:
1364-548X
Subject:
alloys; catalysts; catalytic activity; equations; nitric oxide; oxidation
Abstract:
... An approach to rationally design optimal alloy catalysts is established using nitric oxide (NO) oxidation as an example. We introduce a quantitative structure–energy equation to predict the chemisorption energies of adsorbates on alloy catalysts. The structure–energy descriptor is used to rationally design Pt-based and Ni-based alloy catalysts for NO oxidation. Full first principles calculations w ...
DOI:
10.1039/c9cc09251j

36. Activation of graphitic carbon nitride (g-C₃N₄) by alkaline hydrothermal treatment for photocatalytic NO oxidation in gas phase

Author:
Taizo Sano; Sakiko Tsutsui; Kazuhide Koike; Tsutomu Hirakawa; Yoshiyuki Teramoto; Nobuaki Negishi; Koji Takeuchi
Source:
Journal of materials chemistry A 2013 v.1 no.21 pp. 6489-6496
ISSN:
2050-7496
Subject:
X-ray diffraction; air; carbon nitride; catalysts; electron microscopy; graphene; heat; hot water treatment; hydrolysis; light; melamine; nitric oxide; oxidation; photocatalysis; porous media; sodium hydroxide; surface area
Abstract:
... Photocatalytic activity of graphitic carbon nitride (g-C₃N₄) was significantly improved by an alkaline hydrothermal treatment. The specific surface area of g-C₃N₄ obtained by heating melamine at 550 °C was only 7.7 m² g⁻¹, which was too small for it to be utilized as a catalyst for air purification. By the hydrothermal treatment with NaOH solution at 90–150 °C, the surface area was increased up to ...
DOI:
10.1039/c3ta10472a

37. Activation of oxygen on (NH3CuNH3)+ in NH3-SCR over Cu-CHA

Author:
Lin Chen; Hanne Falsig; Ton V.W. Janssens; Henrik Grönbeck
Source:
Journal of catalysis 2018 v.358 pp. 179-186
ISSN:
0021-9517
Subject:
activation energy; adsorption; catalysts; copper; density functional theory; dissociation; molecular dynamics; nitrates; nitric oxide; nitrites; nitrogen dioxide; oxygen
Abstract:
... Cu-CHA materials are efficient catalysts for NH3–SCR of NOx in oxygen excess. A crucial step in the reaction is oxygen (O2) activation, which still is not well understood. Density functional theory calculations in combination with ab initio thermodynamics and molecular dynamics are here used to study O2 dissociation on Cu(NH3)2+ species, which are present under NH3–SCR conditions. Direct dissociat ...
DOI:
10.1016/j.jcat.2017.12.009

38. Active Tetrahedral Iron Sites of γ-Fe2O3 Catalyzing NO Reduction by NH3

Author:
Qu Weiye; Chen Yaxin; Huang Zhiwei; Gao Jiayi; Zhou Meijuan; Chen Junxiao; Li Chao; Ma Zhen; Chen Jianmin; Tang Xingfu
Source:
Environmental Science & Technology Letters 2017 v.4 no.6 pp. 246-250
ISSN:
2328-8930
Subject:
X-radiation; active sites; ammonia; catalysts; density functional theory; ferric oxide; iron; maghemite; nitric oxide; spectral analysis; titanium; zinc
Abstract:
... Maghemite (γ-Fe₂O₃) with a spinel structure, consisting of tetrahedral Fe³⁺ (Fe³⁺Td) and octahedral Fe³⁺ (Fe³⁺Oₕ) sites, has been intensively investigated as an environmentally benign catalyst for selective catalytic reduction (SCR) of NOₓ with NH₃. In most cases, Fe³⁺Oₕ sites were regarded as catalytically active sites (CASs). Here we identify the CASs in SCR by substituting Fe³⁺Oₕ or Fe³⁺Td site ...
DOI:
10.1021/acs.estlett.7b00124

39. Active sites for NO reduction over Fe-ZSM-5 catalysts

Author:
M. Schwidder; M. Santhosh Kumar; A. Brückner; W. Grünert
Source:
Chemical communications 2005 v. no.6 pp. 805-807
ISSN:
1364-548X
Subject:
active sites; ammonia; butanes; catalysts; catalytic activity; electron paramagnetic resonance spectroscopy; iron; nitric oxide; oxidation; reducing agents; spectral analysis; ultraviolet-visible spectroscopy
Abstract:
... A study of Fe-ZSM-5 catalysts with variable amounts of isolated, oligomeric and heavily aggregated Fe³⁺ oxo sites (as evidenced by UV-Vis and EPR spectroscopic data) and their catalytic properties in the selective catalytic reduction of NO by isobutane or by NH₃ is presented, which allows development of a unified concept of the active Fe sites in these reactions, according to which isolated Fe sit ...
DOI:
10.1039/b414179b

40. Active sites speciation of supported CoMoS phase probed by NO molecule: A combined IR and DFT study

Author:
Fabien Caron; Mickaël Rivallan; Séverine Humbert; Antoine Daudin; Silvia Bordiga; Pascal Raybaud
Source:
Journal of catalysis 2018 v.361 pp. 62-72
ISSN:
0021-9517
Subject:
active sites; catalysts; chemometrics; cobalt; density functional theory; infrared spectroscopy; molybdenum; molybdenum disulfide; nitric oxide; silica
Abstract:
... By using infrared spectroscopy and second derivative analysis, we identify key vibrational components of NO adsorbed the sulfided phases present in hydrodesulfurization (HDS) supported catalysts: MoS₂, cobalt promoted MoS₂ (CoMoS) and Co₉S₈. With the help of density functional theory (DFT) calculations, five components (A, A′, B, B′, C) identified by the second derivative analysis are assigned to ...
DOI:
10.1016/j.jcat.2018.02.017

41. Activity Trends for Catalytic CO and NO Co-Oxidation at Low Temperature Diesel Emission Conditions

Author:
Yuying Song; Lars C. Grabow
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.38 pp. 12715-12725
ISSN:
1520-5045
Subject:
adsorption; alloys; carbon monoxide; catalysts; copper; density functional theory; gold; models; nitric oxide; oxidation; oxygen; palladium; particulate emissions; platinum; pollutants; process design; silver; temperature
Abstract:
... The diesel oxidation catalyst (DOC) is an essential component of modern vehicle emissions control systems. The pervasive challenge for low temperature oxidation of engine exhaust gas is the mutual inhibition between the various pollutants, causing a marked increase in light-off temperature. Using a combination of density functional theory and descriptor-based microkinetic modeling, we have screene ...
DOI:
10.1021/acs.iecr.8b01905

42. Activity and hydrothermal stability of CeO2–ZrO2–WO3 for the selective catalytic reduction of NOx with NH3

Author:
Zhongxian Song; Ping Ning; Qiulin Zhang; Hao Li; Jinhui Zhang; Yancai Wang; Xin Liu; Zhenzhen Huang
Source:
Journal of environmental sciences (China) 2016 v.42 pp. 168-177
ISSN:
1001-0742
Subject:
acidity; ammonia; catalysts; catalytic activity; hot water treatment; nitric oxide; temperature; tungsten oxide
Abstract:
... A series of CeO2–ZrO2–WO3 (CZW) catalysts prepared by a hydrothermal synthesis method showed excellent catalytic activity for selective catalytic reduction (SCR) of NO with NH3 over a wide temperature of 150–550°C. The effect of hydrothermal treatment of CZW catalysts on SCR activity was investigated in the presence of 10% H2O. The fresh catalyst showed above 90% NOx conversion at 201–459°C, which ...
DOI:
10.1016/j.jes.2015.06.010

43. Activity and thermal stability of Pt/Ce0.64Mn0.16R0.2Ox (R=Al, Zr, La, or Y) for soot and NO oxidation

Author:
Hai-Long Zhang; Yi Zhu; Shi-Dan Wang; Ming Zhao; Mao-Chu Gong; Yao-Qiang Chen
Source:
Fuel processing technology 2015 v.137 pp. 38-47
ISSN:
0378-3820
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; aluminum; aluminum oxide; catalysts; ceric oxide; cerium; coprecipitation; heat treatment; lanthanum; manganese; manganese oxides; nitric oxide; nitrogen dioxide; oxidants; oxidation; platinum; soot; temperature; thermal stability; yttrium; zirconium; zirconium oxide
Abstract:
... In this study, Al2O3, ZrO2, La2O3, and Y2O3 were separately introduced into Pt/CeO2-MnOx catalyst to improve the thermal stability of catalysts and obtain a better soot and NO oxidation activity after thermal treatment. CeO2-MnOx-ROx (R=Al, La, Y, or Zr) mixed oxides were prepared by a co-precipitation method. The catalysts were characterized by XRD, BET, H2-TPR, CO chemisorption, XPS, TG analysis ...
DOI:
10.1016/j.fuproc.2015.03.027

44. Adsorption and oxidation of elemental mercury from coal-fired flue gas over activated coke loaded with Mn–Ni oxides

Author:
Qiang Zeng; Caiting Li; Shanhong Li; Miao Liu; Xueyu Du; Lei Gao; Yunbo Zhai
Source:
Environmental science and pollution research international 2019 v.26 no.15 pp. 15420-15435
ISSN:
0944-1344
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; catalysts; coal; flue gas; mercury; nitric oxide; nitrogen; oxidation; oxygen; scanning electron microscopy; sulfur dioxide; surface area; thermogravimetry
Abstract:
... A series of Mn–Ni/AC (AC, activated coke) catalysts were synthesized by the impregnation method for the removal of elemental mercury (Hg⁰) from simulated flue gas. The samples were characterized by BET, ICP-OES, SEM, XRD, XPS, H₂-TPR, FT-IR, and TGA. Mn₆Ni₀.₇₅/AC exhibited optimal removal efficiency of 96.6% in the condition of 6% O₂ and balanced in N₂ at 150 °C. The experimental results showed th ...
DOI:
10.1007/s11356-019-04864-1

45. Adsorption mechanism of NH3, NO, and O2 molecules over MnxOy/Ni (111) surface: a density functional theory study

Author:
Qilong Fang; Baozhong Zhu; Yunlan Sun; Weiyi Song; Chaoyue Xie; Minggao Xu
Source:
Journal of materials science 2019 v.54 no.23 pp. 14414-14430
ISSN:
0022-2461
Subject:
adsorption; ammonia; catalysts; catalytic activity; chemical reduction; density functional theory; emissions; manganese; manganese dioxide; models; nickel; nitrates; nitric oxide; nitrites; nitrogen dioxide; oxygen; spices
Abstract:
... Selective catalytic reduction of NOₓ with NH₃ is one of the most effective ways to reduce NOₓ emissions. Manganese-based deNOₓ catalysts have attracted much attention owing to their unstable valence states. Nickel-foam-supported manganese-based catalysts show excellent low-temperature deNOₓ activities. However, the detailed deNOₓ mechanism is still unclear. In this paper, the adsorption mechanism ...
DOI:
10.1007/s10853-019-03929-3

46. Adsorption of CO, NO, and H₂ on the PdₙAu₅₅–ₙ Nanoclusters: A Density Functional Theory Investigation within the van der Waals D3 Corrections

Author:
Krys E. A. Batista; Juarez L. F. Da Silva; Maurício J. Piotrowski
Source:
Journal of physical chemistry 2019 v.123 no.12 pp. 7431-7439
ISSN:
1932-7455
Subject:
adsorption; carbon monoxide; catalysts; catalytic activity; center of gravity; density functional theory; energy; gold; hydrogen; nanogold; nanoparticles; nitric oxide; palladium; physicochemical properties; van der Waals forces
Abstract:
... The PdAu nanoclusters have innumerable potential applications in catalysis, especially because of the changes of the physical and chemical properties as a function of the composition and geometric shape; however, the understanding of the adsorption process is far from satisfactory mainly because of the strong dependence of the adsorption properties on the size, shape, and composition of the nanocl ...
DOI:
10.1021/acs.jpcc.8b12219

47. Adsorption of Nitrogen Oxides on TiO2 Surface as a Function of NO2 and N2O5 Fraction in the Gas Phase

Author:
Kalev Erme; Jüri Raud; Indrek Jõgi
Source:
Langmuir 2018 v.34 no.22 pp. 6338-6345
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; adsorption; catalysts; gases; models; nitrates; nitric oxide; nitrogen; nitrogen dioxide; oxidation; oxygen; ozone; titanium dioxide
Abstract:
... The present study was devoted to the investigation of adsorption of nitrogen oxides on TiO₂, with the focus on the effect of NOₓ concentration, composition, and flow rate. The inlet NO with a concentration of 200–800 ppm in pure N₂ was mixed with ozone, produced from pure oxygen, and directed to a reactor with catalytic TiO₂ powder. The oxidation of NO by ozone allowed to prepare mixtures with var ...
DOI:
10.1021/acs.langmuir.7b03864

48. Adsorption properties of NO, NH3, and O2 over β-MnO2(110) surface

Author:
Baozhong Zhu; Qilong Fang; Yunlan Sun; Shoulai Yin; Guobo Li; Zhaohui Zi; Tingting Ge; Zicheng Zhu; Mengxing Zhang; Jiaxin Li
Source:
Journal of materials science 2018 v.53 no.16 pp. 11500-11511
ISSN:
0022-2461
Subject:
adsorption; ammonia; catalysts; catalytic activity; density functional theory; emissions; manganese oxides; nitrates; nitric oxide; nitrites; oxygen; reaction mechanisms
Abstract:
... Selective catalytic reduction (SCR) of NOₓ with NH₃ has been widely adopted to reduce NOₓ emissions. Although MnOₓ-based catalysts exhibit higher NOₓ conversion, the underlying reaction mechanism is still unclear. Since the SCR is a gas–solid catalytic reaction, the adsorption of related gas species on the catalyst surface plays a key role. In this study, the adsorption of NO, NH₃, and O₂ on β-MnO ...
DOI:
10.1007/s10853-018-2437-7

49. Advanced Insight into the Size Effect of PtPd Nanoparticles on NO Oxidation by in Situ FTIR Spectra

Author:
Yanli Liang; Chenying Ou; Hao Zhang; Xinmei Ding; Ming Zhao; Jianli Wang; Yaoqiang Chen
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.11 pp. 3887-3897
ISSN:
1520-5045
Subject:
Fourier transform infrared spectroscopy; catalysts; catalytic activity; hot water treatment; nanoparticles; nitrates; nitric oxide; oxidation; particle size; process design
Abstract:
... It is a recognized view that particle size could play a significant role in catalytic performance. To obtain the nanoparticles with the different size, a series of bimetallic PtPd/SiO₂–Al₂O₃ catalysts subjected to hydrothermal treatment in different time were prepared and applied for NO oxidation under diesel exhaust. The experimental results confirmed that the average noble particle size was grad ...
DOI:
10.1021/acs.iecr.7b05316

50. Advantages of bimetallic nitric oxide reduction catalysts consisting of heavy metals rich in hazardous wastes

Author:
Yirui Wang; Jinyang Li; Jia Zhang; Jingyi Zhang; Dong Zhai; Guangren Qian; Yi Liu; Chuncheng Zuo
Source:
Journal of cleaner production 2019 pp. 117834
ISSN:
0959-6526
Subject:
carbon; catalysts; catalytic activity; hazardous waste; heavy metals; nitric oxide; recycling; reducing agents
Abstract:
... High-value-added recycling of hazardous waste is a key problem in environmental science and engineering. In previous reports, a hazardous-waste-derived catalyst showed better activity than a catalyst synthesised from pure reagents for the reduction of nitric oxide. The multimetallic nature of hazardous waste was speculated to increase the catalytic activity. In this work, a further investigation w ...
DOI:
10.1016/j.jclepro.2019.117834