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You searched for: Journal name Chemical communications Remove constraint Journal name: Chemical communications Subject term catalysts Remove constraint Subject term: catalysts Subject term catalytic activity Remove constraint Subject term: catalytic activity Subject term ammonia Remove constraint Subject term: ammonia
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1. A TiO₂₋ₓ nanobelt array with oxygen vacancies: an efficient electrocatalyst toward nitrite conversion to ammonia

Author:
Donglin Zhao; Jie Liang; Jun Li; Longcheng Zhang; Kai Dong; Luchao Yue; Yongsong Luo; Yuchun Ren; Qian Liu; Mohamed S. Hamdy; Quan Li; Qingquan Kong; Xuping Sun
Source:
Chemical communications 2022 v.58 no.22 pp. 3669-3672
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; durability; nitrites; oxygen; titanium
Abstract:
... Electrocatalytic nitrite reduction not only holds significant potential in the control of nitrite contamination in the natural environment, but also is an attractive approach for sustainable ammonia synthesis. In this communication, we report that a TiO₂₋ₓ nanobelt array with oxygen vacancies on a titanium plate is able to convert nitrite into ammonia with a high faradaic efficiency of 92.7% and a ...
DOI:
10.1039/d2cc00856d

2. In situ formed Co from a Co–Mg–O solid solution synergizing with LiH for efficient ammonia synthesis

Author:
Wenbo Gao; Sheng Feng; Hanxue Yan; Qianru Wang; Hua Xie; Ling Jiang; Weijin Zhang; Yeqin Guan; Han Wu; Hujun Cao; Jianping Guo; Ping Chen
Source:
Chemical communications 2021 v.57 no.69 pp. 8576-8579
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; cobalt; magnesium oxide; reducing agents
Abstract:
... A cobalt magnesium oxide solid solution (Co–Mg–O) supported LiH catalyst has been synthesized, in which LiH functions both as a strong reductant for the in situ formation of Co metal nanoparticles and a key active component for ammonia synthesis catalysis. Dispersion of the Co–LiH composite on the Co–Mg–O support results in a significantly higher ammonia synthesis rate under mild reaction conditio ...
DOI:
10.1039/d1cc03063a

3. Bi nanodendrites for efficient electrocatalytic N₂ fixation to NH₃ under ambient conditions

Author:
Fengyi Wang; Xu Lv; Xiaojuan Zhu; Juan Du; Siyu Lu; Abdulmohsen Ali Alshehri; Khalid Ahmed Alzahrani; Baozhan Zheng; Xuping Sun
Source:
Chemical communications 2020 v.56 no.14 pp. 2107-2110
ISSN:
1364-548X
Subject:
ammonia; bismuth; catalysts; catalytic activity; chemical reduction; durability; electrochemistry; electrodes; hydrochloric acid; hydrogen; nitrogen; nitrogen fixation
Abstract:
... Electrochemical N₂ reduction has emerged as a sustainable and eco-friendly route for the artificial synthesis of NH₃ under ambient conditions, but active electrocatalysts are needed to drive the N₂ reduction reaction (NRR). Here, Bi nanodendrites are reported as an efficient NRR electrocatalyst for N₂ to NH₃ conversion with excellent selectivity. In 0.1 M HCl, this catalyst achieves a large NH₃ yi ...
DOI:
10.1039/c9cc09803h

4. Boron and nitrogen dual-doped carbon nanospheres for efficient electrochemical reduction of N₂ to NH₃

Author:
Shenglin Xiao; Fang Luo; Hao Hu; Zehui Yang
Source:
Chemical communications 2020 v.56 no.3 pp. 446-449
ISSN:
1364-548X
Subject:
ammonia; boron; carbon; catalysts; catalytic activity; chemical reactions; electrochemistry; electrolytes; nanospheres; nitrogen; sulfuric acid
Abstract:
... Boron and nitrogen dual-doped carbon nanospheres (BNC-NSs) show exceptional electrocatalytic activity toward the nitrogen reduction reaction, with an NH₃ yield rate of 15.7 μgNH₃ h⁻¹ mgcₐₜ.⁻¹ and faradaic efficiency of 8.1% at −400 mV vs. RHE in 0.05 M H₂SO₄ electrolyte. Meanwhile, stable electrocatalyst activity was also achieved for the BNC-NS electrocatalyst. ...
DOI:
10.1039/c9cc07708a

5. Key factor for the anti-Arrhenius low-temperature heterogeneous catalysis induced by H⁺ migration: H⁺ coverage over support

Author:
Kota Murakami; Yuta Tanaka; Ryuya Sakai; Yudai Hisai; Sasuga Hayashi; Yuta Mizutani; Takuma Higo; Shuhei Ogo; Jeong Gil Seo; Hideaki Tsuneki; Yasushi Sekine
Source:
Chemical communications 2020 v.56 no.23 pp. 3365-3368
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; electric field; protons
Abstract:
... Low-temperature heterogeneous catalytic reaction in an electric field is anticipated as a novel approach for on-demand and small-scale catalytic processes. This report quantitatively reveals the important role of proton coverage on the catalyst support for catalytic ammonia synthesis in an electric field, which shows an anti-Arrhenius behaviour. ...
DOI:
10.1039/d0cc00482k

6. P-Doped graphene toward enhanced electrocatalytic N₂ reduction

Author:
Tongwei Wu; Xinyi Li; Xiaojuan Zhu; Shiyong Mou; Yonglan Luo; Xifeng Shi; Abdullah M. Asiri; Yanning Zhang; Baozhan Zheng; Haitao Zhao; Xuping Sun
Source:
Chemical communications 2020 v.56 no.12 pp. 1831-1834
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reduction; density functional theory; electrochemistry; electrodes; graphene; hydrogen; nitrogen; phosphorus
Abstract:
... Catalysts for the N₂ reduction reaction (NRR) are at the heart of key alternative technology to the Haber–Bosch process for NH₃ synthesis, and are expected to optimize the interplay between efficiency, activity and selectivity. Here, we report our recent finding that P-doped graphene shows superior NRR performances in aqueous media at present, with a remarkably large NH₃ yield of 32.33 μg h⁻¹ mgcₐ ...
DOI:
10.1039/c9cc09179c

7. Time-resolved observation of V₂O₅/TiO₂ in NH₃-SCR reveals the equivalence of Brønsted and Lewis acid sites

Author:
Inhak Song; Hwangho Lee; Se Won Jeon; Taejin Kim; Do Heui Kim
Source:
Chemical communications 2020 v.56 no.98 pp. 15450-15453
ISSN:
1364-548X
Subject:
Bronsted acids; Lewis acids; ammonia; catalysts; catalytic activity; chemical reduction; lithium; nitric oxide; titanium dioxide; vanadium
Abstract:
... The involvement of Lewis and Brønsted acid sites on V₂O₅/TiO₂ catalyst in the selective catalytic reduction of NO with NH₃ (NH₃-SCR) is under debate. Here, a Li doping strategy is applied to selectively block Brønsted sites, which aims to prepare model catalysts with the same V loading but different ratios of the two acid sites. Time-resolved in situ DRIFTS observation demonstrates that the surfac ...
DOI:
10.1039/d0cc06006b

8. Ti³⁺ self-doped TiO₂₋ₓ nanowires for efficient electrocatalytic N₂ reduction to NH₃

Author:
Bingyue Li; Xiaojuan Zhu; Jianwei Wang; Ruimin Xing; Qian Liu; Xifeng Shi; Yonglan Luo; Shanhu Liu; Xiaobin Niu; Xuping Sun
Source:
Chemical communications 2020 v.56 no.7 pp. 1074-1077
ISSN:
1364-548X
Subject:
active sites; ammonia; catalysts; catalytic activity; chemical reactions; density functional theory; electrochemistry; electrodes; energy; hydrogen; nanowires; nitrogen; sodium sulfate; titanium; titanium dioxide
Abstract:
... Electrochemical N₂ reduction is an environmentally friendly and sustainable approach for NH₃ synthesis under mild conditions, while an efficient electrocatalyst is crucial for the N₂ reduction reaction (NRR). Herein, we report Ti³⁺ self-doped TiO₂₋ₓ nanowires on Ti mesh (Ti³⁺–TiO₂₋ₓ/TM) as an efficient non-noble-metal NRR electrocatalyst with excellent selectivity. In 0.1 M Na₂SO₄, the Ti³⁺–TiO₂₋ₓ ...
DOI:
10.1039/c9cc08971c

9. Unusual electrochemical N₂ reduction activity in an earth-abundant iron catalyst via phosphorous modulation

Author:
Xiaojuan Zhu; Tongwei Wu; Lei Ji; Qian Liu; Yonglan Luo; Guanwei Cui; Yimo Xiang; Yanning Zhang; Baozhan Zheng; Xuping Sun
Source:
Chemical communications 2020 v.56 no.5 pp. 731-734
ISSN:
1364-548X
Subject:
active sites; adsorption; ammonia; catalysts; catalytic activity; chemical reactions; electrochemistry; electrodes; energy; graphene oxide; hydrogen; hydrogen production; iron; nitrogen; phosphorus
Abstract:
... Fe-enabled high-performance ambient electrochemical N₂ reduction still remains a big challenge. Here, we report the unusual role of phosphorous in modulating the electrochemical N₂ reduction activity of an Fe catalyst. An FeP₂ nanoparticle–reduced graphene oxide hybrid (FeP₂–rGO) attains a large NH₃ yield of 35.26 μg h⁻¹ mgcₐₜ.⁻¹ (7.06 μg h⁻¹ cm⁻²) and a high faradaic efficiency of 21.99% at −0.40 ...
DOI:
10.1039/c9cc08352a

10. A pyrolysis–phosphorization approach to fabricate carbon nanotubes with embedded CoP nanoparticles for ambient electrosynthesis of ammonia

Author:
Shengbo Zhang; Wanbing Gong; Yang Lv; Haojie Wang; Miaomiao Han; Guozhong Wang; Tongfei Shi; Haimin Zhang
Source:
Chemical communications 2019 v.55 no.82 pp. 12376-12379
ISSN:
1364-548X
Subject:
ammonia; carbon nanotubes; catalysts; catalytic activity; cobalt; electrochemistry; electrolytes; electrosynthesis; hydrogenation; isotope labeling; nanoparticles; nitrogen; sodium sulfate; stable isotopes
Abstract:
... We report a pyrolysis–phosphorization approach to fabricate carbon nanotubes with embedded CoP nanoparticles (CoP/CNs) using ZIF-67 as a precursor for electrocatalytic nitrogen (N₂) reduction to ammonia (NH₃) under ambient conditions. The results demonstrate that the as-synthesized CoP/CNs as electrocatalysts exhibit high electrocatalytic activity toward the N₂ reduction reaction (NRR), affording ...
DOI:
10.1039/c9cc06385d

11. Boosting electrocatalytic nitrogen fixation via energy-efficient anodic oxidation of sodium gluconate

Author:
Lu Zhao; Xuan Kuang; Cheng Chen; Xu Sun; Zhiling Wang; Qin Wei
Source:
Chemical communications 2019 v.55 no.68 pp. 10170-10173
ISSN:
1364-548X
Subject:
ammonia; anodes; carbon; catalysts; catalytic activity; cathodes; electrochemistry; electrosynthesis; energy efficiency; glucaric acid; gluconates; nitrogen; nitrogen fixation; oxidation
Abstract:
... Here, we report an anodic replacement of the water oxidation reaction with more readily oxidizable species to facilitate ambient electrocatalytic nitrogen reduction reaction (NRR). A self-supported catalyst, Cuᴵᴵ–MOF on carbon cloth (JUC-1000/CC), acts as a versatile cathode and anode for both NRR and electro-oxidation of sodium gluconate to glucaric acid. Impressively, the two-electrode system re ...
DOI:
10.1039/c9cc04378k

12. Catalytic hydrazine disproportionation mediated by a thiolate-bridged VFe complex

Author:
Nina X. Gu; Gaël Ung; Jonas C. Peters
Source:
Chemical communications 2019 v.55 no.37 pp. 5363-5366
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; hydrazine; iron
Abstract:
... A heterobimetallic VFe complex is demonstrated to catalyse hydrazine disproportionation with yields of up to 1073 equivalents of NH₃ per catalyst, comparable to the highest turnover known for any molecular catalyst. Notably, the heterobimetallic complex is appreciably more active than monometallic analogues of the V and Fe sites, suggesting that bimetallic cooperativity may facilitate the observed ...
DOI:
10.1039/c9cc00345b

13. Ceria-reduced graphene oxide nanocomposite as an efficient electrocatalyst towards artificial N₂ conversion to NH₃ under ambient conditions

Author:
Hongtao Xie; Qin Geng; Xin Li; Ting Wang; Yonglan Luo; Abdulmohsen Ali Alshehri; Khalid Ahmad Alzahrani; Baihai Li; Zhiming Wang; Jian Mao
Source:
Chemical communications 2019 v.55 no.72 pp. 10717-10720
ISSN:
1364-548X
Subject:
ammonia; carbon dioxide; catalysts; catalytic activity; ceric oxide; chemical reactions; density functional theory; electrochemistry; electrodes; energy costs; graphene oxide; greenhouse gas emissions; hydrogen; nanocomposites; nitrogen; renewable energy sources; sodium sulfate
Abstract:
... For over a century, NH₃ synthesis via the Haber–Bosch process has brought huge energy costs and high CO₂ emission. The electrochemical N₂ reduction reaction is an environmentally-benign alternative, which can be driven by renewable energy. In this work, CeO₂ nanoparticle–reduced graphene oxide nanocomposites (CeO₂–rGO) behave as an efficient non-noble-metal N₂ reduction reaction electrocatalyst wi ...
DOI:
10.1039/c9cc05309c

14. Excavated cubic platinum–iridium alloy nanocrystals with high-index facets as highly efficient electrocatalysts in N₂ fixation to NH₃

Author:
Yu-Jie Mao; Lu Wei; Xin-Sheng Zhao; Yong-Sheng Wei; Jian-Wei Li; Tian Sheng; Fu-Chun Zhu; Na Tian; Zhi-You Zhou; Shi-Gang Sun
Source:
Chemical communications 2019 v.55 no.63 pp. 9335-9338
ISSN:
1364-548X
Subject:
alloys; ammonia; catalysts; catalytic activity; chemical reactions; electrochemistry; hydrogen production; iridium; nanocrystals; nitrogen; nitrogen fixation; platinum
Abstract:
... Excavated cubic Pt₉₃Ir₇ alloy nanocrystals enclosed by high-index {710} facets exhibit excellent electrocatalytic properties for the nitrogen reduction reaction (NRR) with a high faradaic efficiency (40.8%) and NH₃ production rate (28 μg h⁻¹ cm⁻²). The presence of Ir on the Pt stepped surface suppresses the hydrogen evolution reaction (HER) and accelerates the NRR. ...
DOI:
10.1039/c9cc04034j

15. High-efficiency electrocatalyst for N₂ conversion to NH₃ based on Au nanoparticles loaded on defective WO₃₋ₓ

Author:
Youzeng Li; Pengfei Yan; Jun Chen; Yumei Ren; Yannan Zhou; Tianpei Ge; Qun Xu
Source:
Chemical communications 2019 v.55 no.88 pp. 13307-13310
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; density functional theory; electrochemistry; electrodes; electron transfer; gold; hydrogen; nanogold; nitrogen; potassium hydroxide
Abstract:
... In this work, Au nanoparticles (NPs) grown on defective WO₃₋ₓ (Au/WO₃₋ₓ) show superior electrocatalytic N₂ reduction activity under ambient conditions in 0.1 M KOH. At −0.2 V versus the reversible hydrogen electrode (vs. RHE), the Au/WO₃₋ₓ catalyst achieves a large NH₃ yield of 23.15 μg h⁻¹ mg⁻¹ and a high faradaic efficiency (FE) of 14.72%. Further density functional theory (DFT) calculations ind ...
DOI:
10.1039/c9cc06550d

16. Metal–support interactions on Ru/CaAlOₓ catalysts derived from structural reconstruction of Ca–Al layered double hydroxides for ammonia decomposition

Author:
Jiawen Zhao; Shuang Xu; Hongjie Wu; Zhixiong You; Lidan Deng; Xinhong Qiu
Source:
Chemical communications 2019 v.55 no.96 pp. 14410-14413
ISSN:
1364-548X
Subject:
adsorption; aluminum; ammonia; aqueous solutions; calcium; catalysts; catalytic activity; chemical reactions; hydroxides; nanoparticles; ruthenium; temperature
Abstract:
... Strong metal–support interaction (SMSI) over Ru/CaAlOₓ was constructed by utilizing the surface structural reconstruction of Ca–Al layered double hydroxides (LDHs) in aqueous solution and their subsequent hydroxide-to-oxide transformations. Ru nanoparticles were found to uniformly embed with CaAlOₓ. The electronic interactions and changes in CO adsorption behavior confirmed the SMSI state between ...
DOI:
10.1039/c9cc05706d

17. Sb₂S₃ nanoparticles anchored on SnO₂ nanofibers: a high-performance hybrid electrocatalyst toward ammonia synthesis under ambient conditions

Author:
Di Li; Xingxing Chen; Yi-Tao Liu; Jianyong Yu; Bin Ding
Source:
Chemical communications 2019 v.55 no.92 pp. 13892-13895
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; electrochemistry; nanofibers; nanoparticles; sodium sulfate; sulfides; tin dioxide
Abstract:
... Herein, we report a novel transition-metal-based electrocatalyst, Sb₂S₃ nanoparticles, which exhibits electrocatalytic activity toward ammonia synthesis under ambient conditions. These Sb₂S₃ nanoparticles are further anchored on SnO₂ nanofibers, which act as an active substrate to prevent them from aggregation while enhancing the electrocatalytic activity. The obtained Sb₂S₃@SnO₂ nanofibers delive ...
DOI:
10.1039/c9cc07847a

18. Selective electroreduction of dinitrogen to ammonia on a molecular iron phthalocyanine/O-MWCNT catalyst under ambient conditions

Author:
Fanfan Xu; Linlin Zhang; Xin Ding; Meiyu Cong; Yu Jin; Lin Chen; Yan Gao
Source:
Chemical communications 2019 v.55 no.94 pp. 14111-14114
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reduction; electrochemistry; electrolytes; iron; nitrogen
Abstract:
... Effective catalysts with sufficient activity and selectivity are essential for the nitrogen reduction reaction (NRR). Many fruitful NRR electrocatalysts have been investigated with regard to NH₃ production under ambient conditions in recent years. However, well-defined and modifiable molecular catalysts have rarely been reported for the NRR to date. Here, molecular FePc was grafted on an O-MWCNT s ...
DOI:
10.1039/c9cc06574a

19. Strong metal–support interactions of Co-based catalysts facilitated by dopamine for highly efficient ammonia synthesis: in situ XPS and XAFS spectroscopy coupled with TPD studies

Author:
Xiuyun Wang; Lingling Li; Tianhua Zhang; Bingyu Lin; Jun Ni; Chak-Tong Au; Lilong Jiang
Source:
Chemical communications 2019 v.55 no.4 pp. 474-477
ISSN:
1364-548X
Subject:
X-ray photoelectron spectroscopy; activation energy; ammonia; carbon; catalysts; catalytic activity; chemical reactions; cobalt; dopamine; nanoparticles; nitrogen; temperature
Abstract:
... We report a new strategy for strengthening metal–support interaction and stabilizing Co nanoparticles at high temperature. Through the use of dopamine and removal of carbon layers by thermal N₂ treatment, ceria-based Co catalysts that are efficient and highly stable for ammonia synthesis can be obtained. The ammonia synthesis rate at 425 °C and 1 MPa is enhanced from 3.81 mmolNH₃ gcₐₜ⁻¹ h⁻¹ over C ...
DOI:
10.1039/c8cc07130f

20. Synergistic bimetallic CoFe₂O₄ clusters supported on graphene for ambient electrocatalytic reduction of nitrogen to ammonia

Author:
Muhammad Ibrar Ahmed; Sheng Chen; Wenhao Ren; Xianjue Chen; Chuan Zhao
Source:
Chemical communications 2019 v.55 no.81 pp. 12184-12187
ISSN:
1364-548X
Subject:
active sites; adsorption; ammonia; carbon dioxide; catalysts; catalytic activity; chemical reactions; cobalt; cobalt oxide; electrochemistry; electrolytes; graphene; graphene oxide; greenhouse gas emissions; iron; iron oxides; nanoparticles; nitrogen; sodium sulfate
Abstract:
... The energy-intensive nature, high level of CO₂ emission and sophisticated infrastructure requirement hampered the utilization of the Haber–Bosch process as a green and decentralized system for NH₃ production. The electrochemical N₂ reduction reaction (NRR) provides a promising alternative to fix N₂ under ambient conditions. Here, we report CoFe₂O₄ nanoclusters anchored on reduced graphene oxide fo ...
DOI:
10.1039/c9cc05684j

21. Size structure–catalytic performance correlation of supported Ni/MCF-17 catalysts for COₓ-free hydrogen production

Author:
Yanping Li; Jie Wen; Arshid M. Ali; Ming Duan; Wei Zhu; Hui Zhang; Chen Chen; Yadong Li
Source:
Chemical communications 2018 v.54 no.49 pp. 6364-6367
ISSN:
1364-548X
Subject:
active sites; ammonia; catalysts; catalytic activity; chemical reactions; fuel cells; hydrogen production; nanocrystals; nanoparticles; nickel; particle size; temperature
Abstract:
... Herein, supported Ni/MCF-17 catalysts with the size of nickel nanocrystal in the range of 1.5–8.0 nm were synthesized and employed for COₓ-free hydrogen production for fuel cells via the ammonia decomposition reaction. Characterized by a variety of techniques, the results show that nickel particles are in a highly dispersed state with a uniform particle size for each catalyst. Furthermore, the inf ...
DOI:
10.1039/c8cc01884g

22. Triple-shelled NiMn₂O₄ hollow spheres as an efficient catalyst for low-temperature selective catalytic reduction of NOₓ with NH₃

Author:
Yanling HanThese authors contributed equally to this work.; Jincheng Mu; Xinyong Li; Jinsuo Gao; Shiying Fan; Feng Tan; Qidong Zhao
Source:
Chemical communications 2018 v.54 no.70 pp. 9797-9800
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; nitrogen oxides; temperature
Abstract:
... Unique triple-shelled NiMn₂O₄ hollow spheres are fabricated by a facile solvothermal method. Owing to its particular triple shell structure, the as prepared NiMn₂O₄ catalyst exhibits superior low-temperature NH₃-SCR catalytic performance, achieving above 90% NOₓ conversion in the temperature range from 100 °C to 225 °C. ...
DOI:
10.1039/c8cc03625j

23. Formal arylation of NH₃ to produce diphenylamines over supported Pd catalysts

Author:
Yu Koizumi; Kento Taniguchi; Xiongjie Jin; Kazuya Yamaguchi; Kyoko Nozaki; Noritaka Mizuno
Source:
Chemical communications 2017 v.53 no.78 pp. 10827-10830
ISSN:
1364-548X
Subject:
aluminum oxide; ammonia; aromatic amines; arylation; catalysts; catalytic activity; cyclohexanones; nanoparticles; nitrogen; palladium; urea
Abstract:
... In the presence of supported Pd nanoparticle catalysts, e.g., Pd/Al₂O₃, various diphenylamines could be synthesized through acceptorless formal arylation using NH₃ or its surrogates, e.g., urea, as nitrogen sources and cyclohexanones as arylation sources. The observed catalysis was truly heterogeneous, and the catalyst was reusable with retention of its high catalytic performance. ...
DOI:
10.1039/c7cc06737b

24. Highly efficient hydrolysis of ammonia borane by anion (⁻OH, F⁻, Cl⁻)-tuned interactions between reactant molecules and CoP nanoparticles

Author:
Zi-Cheng Fu; Yong Xu; Sharon Lai-Fung Chan; Wei-Wei Wang; Fang Li; Fei Liang; Yong Chen; Zhe-Shuai Lin; Wen-Fu Fu; Chi-Ming Che
Source:
Chemical communications 2017 v.53 no.4 pp. 705-708
ISSN:
1364-548X
Subject:
ambient temperature; ammonia; anions; catalysts; catalytic activity; chlorides; fluorides; hydrolysis; nanoparticles
Abstract:
... The CoP nanoparticle catalyst had excellent catalytic activity and a short catalytic induction period in the presence of anions, and high sustainability in ammonia borane hydrolysis, with an initial turnover frequency of 72.2 mol₍H₂₎ mol₍CₒP₎⁻¹ min⁻¹ at ambient temperature. This value is unprecedented for noble-metal-free catalytic systems. ...
DOI:
10.1039/c6cc08120g

25. Hydrogen generation from glucose catalyzed by organoruthenium catalysts under mild conditions

Author:
Yulu Zhan; Yangbin Shen; Shuping Li; Baohua Yue; Xiaochun Zhou
Source:
Chemical communications 2017 v.53 no.30 pp. 4230-4233
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; fossil fuels; glucose; hydrogen; hydrogen production; p-cymene; pH; pollution; renewable energy sources
Abstract:
... Concerns about the depletion of fossil fuel reserves and environmental pollution make hydrogen an attractive alternative energy source. Here, we first describe a catalytic reaction system that produces H₂ from glucose using a homogeneous catalyst [(p-cymene)Ru(NH₃)]Cl₂ with the maximum TOF = 719 h⁻¹ at 98 °C and an initial pH = 0.5. ...
DOI:
10.1039/c7cc00177k

26. Porous nanopeapod Pd catalyst with excellent stability and efficiency

Author:
Xuecheng Chen; Chao Zhang; Ryszard J. Kalenczuk; Paul K. Chu; Dengsong Zhang; Tao Tang; Ewa Mijowska
Source:
Chemical communications 2017 v.53 no.4 pp. 740-742
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; hydrogen; nanoparticles; nitric oxide; nitrobenzenes; palladium; porous media; silica; surface area
Abstract:
... Porous Pd@m-C/SiO₂ nanopeapods are prepared by a nanoconfinement method. The Pd nanoparticles show high efficiency and stability in chemical reactions such as reduction of nitrobenzene by H₂ and reduction of NO by NH₃. The high catalytic activity is attributed to the unique peapod structure, mesoporous wall, and large specific surface area on Pd@m-C/SiO₂ rendering the Pd nanoparticles highly activ ...
DOI:
10.1039/c6cc08598a

27. Ammonia synthesis over Co–Mo alloy nanoparticle catalyst prepared via sodium naphthalenide-driven reduction

Author:
Yuki Tsuji; Masaaki Kitano; Kazuhisa Kishida; Masato Sasase; Toshiharu Yokoyama; Michikazu Hara; Hideo Hosono
Source:
Chemical communications 2016 v.52 no.100 pp. 14369-14372
ISSN:
1364-548X
Subject:
alloy nanoparticles; alloys; ammonia; catalysts; catalytic activity; chemical reactions
Abstract:
... We report the synthesis of Co–Mo alloy nanoparticles with a uniform distribution of the alloy elements on CeO₂via sodium naphthalenide-driven reduction. The resulting sample functions as a highly efficient and stable catalyst for ammonia synthesis. Based on the metal weight, the catalytic activity is ca. 20 times higher than that of Co₃Mo₃N. ...
DOI:
10.1039/c6cc08566k

28. Remarkable catalysis of a wool-like copper electrode for NH₃ synthesis from N₂ and H₂ in non-thermal atmospheric plasma

Author:
Keigo Aihara; Mao Akiyama; Takashi Deguchi; Masashi Tanaka; Rina Hagiwara; Masakazu Iwamoto
Source:
Chemical communications 2016 v.52 no.93 pp. 13560-13563
ISSN:
1364-548X
Subject:
ammonia; atmospheric pressure; catalysts; catalytic activity; chemical reactions; copper; electrodes; hydrogen; nitrogen
Abstract:
... A wool-like copper electrode used to produce non-thermal plasma functioned as an efficient catalyst for ammonia production from N₂ and H₂ under atmospheric pressure without heating. The catalytic activity increased as the experiments were repeated. The yield of ammonia at H₂/N₂ = 3 was 3.5%. The intensity of the emission spectra of N₂*(C–B) bands was correlated with the ammonia synthesis rate. ...
DOI:
10.1039/c6cc06752b

29. Continuous synthesis of methanol: heterogeneous hydrogenation of ethylene carbonate over Cu/HMS catalysts in a fixed bed reactor system

Author:
Xi Chen; Yuanyuan Cui; Chao Wen; Bin Wang; Wei-Lin Dai
Source:
Chemical communications 2015 v.51 no.72 pp. 13776-13778
ISSN:
1364-548X
Subject:
ammonia; carbon dioxide; carbonates; catalysts; catalytic activity; copper; ethylene; ethylene glycol; evaporation; hydrogenation; methanol
Abstract:
... Continuous fixed-bed catalytic hydrogenation of ethylene carbonate (EC) to methanol and ethylene glycol (EG), an emerging synthetic process of methanol via indirect conversion of CO₂, was successfully performed over Cu/HMS catalysts prepared by the ammonia evaporation (AE) method. The catalysts possessed superb performance with a conversion of 100% and a selectivity to methanol of 74%. ...
DOI:
10.1039/c5cc05030h

30. Electronic promoter or reacting species? The role of LiNH₂ on Ru in catalyzing NH₃ decomposition

Author:
Jianping Guo; Zheng Chen; Anan Wu; Fei Chang; Peikun Wang; Daqiang Hu; Guotao Wu; Zhitao Xiong; Pei Yu; Ping Chen
Source:
Chemical communications 2015 v.51 no.82 pp. 15161-15164
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; electron transfer; hydrogen; nitrogen; ruthenium
Abstract:
... LiNH₂ decomposes to NH₃ rather than N₂ and H₂ because of a severe kinetic barrier in NHₓ (x = 1, 2) coupling. In the presence of Ru, however, a drastic enhancement in N₂ and H₂ formation is obtained, which enables the LiNH₂–Ru composite to act as a highly active catalyst for NH₃ decomposition. Experimental and theoretical investigations indicate that Li creates a NHₓ-rich environment and Ru mediat ...
DOI:
10.1039/c5cc04645a

31. Improved low temperature NH₃-SCR performance of FeMnTiOₓ mixed oxide with CTAB-assisted synthesis

Author:
Shiguo Wu; Xiaojiang Yao; Lei Zhang; Yuan Cao; Weixin Zou; Lulu Li; Kaili Ma; Changjin Tang; Fei Gao; Lin Dong
Source:
Chemical communications 2015 v.51 no.16 pp. 3470-3473
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; cetyltrimethylammonium bromide; chemical reduction; coprecipitation; durability; nitric oxide; nitrogen; temperature
Abstract:
... FeMnTiOₓ mixed oxide is prepared by the CTAB-assisted co-precipitation method, and the transformation of anatase into rutile is inhibited by CTAB to some extent. The catalyst obtained in the present work shows nearly 100% NO conversion at 100–350 °C, more than 80% N₂ selectivity at 75–200 °C, and excellent H₂O durability for the selective catalytic reduction of NO by NH₃ with a space velocity of 3 ...
DOI:
10.1039/c4cc09719j

32. Environmentally-benign catalysts for the selective catalytic reduction of NOₓ from diesel engines: structure–activity relationship and reaction mechanism aspects

Author:
Fudong Liu; Yunbo Yu; Hong He
Source:
Chemical communications 2014 v.50 no.62 pp. 8445-8463
ISSN:
1364-548X
Subject:
aluminum oxide; ammonia; catalysts; catalytic activity; chemical reduction; copper; diesel engines; hydrocarbons; iron; nitrogen oxides; reaction mechanisms; silver; structure-activity relationships; zeolites
Abstract:
... Selective catalytic reduction of NOₓ using NH₃ or hydrocarbons (NH₃-SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure–activity relationship of vanadium-free cataly ...
DOI:
10.1039/c4cc01098a

33. Unique reactivity in Pt/CNT catalyzed hydrolytic dehydrogenation of ammonia borane

Author:
Wenyao Chen; Jian Ji; Xuezhi Duan; Gang Qian; Ping Li; Xinggui Zhou; De Chen; Weikang Yuan
Source:
Chemical communications 2014 v.50 no.17 pp. 2142-2144
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; dehydrogenation; hydrogen production; nanomaterials; oxidation; oxygen; particle size; texture
Abstract:
... We demonstrate an unprecedented H₂ generation activity in the hydrolytic dehydrogenation of ammonia borane over acid oxidation- and subsequent high temperature-treated CNT immobilized Pt nanocatalysts to combine the merits of defect-rich and oxygen group-deficient surfaces and unique textural properties of supports as well as optimum particle size of Pt. ...
DOI:
10.1039/c3cc48027e

34. A superior catalyst with dual redox cycles for the selective reduction of NOₓ by ammonia

Author:
Zhiming Liu; Yang Yi; Junhua Li; Seong Ihl Woo; Baoyi Wang; Xingzhong Cao; Zhuoxin Li
Source:
Chemical communications 2013 v.49 no.70 pp. 7726-7728
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; cerium; chemical communication; chemical reactions; copper; nitrogen; nitrogen oxides; sulfur dioxide; temperature; titanium
Abstract:
... An environmentally benign Cu–Ce–Ti oxide catalyst exhibited excellent NH₃-SCR activity, high N₂ selectivity and strong resistance against H₂O and SO₂ with a broad operation temperature window. The dual redox cycles (Cu²⁺ + Ce³⁺ ↔ Cu⁺ + Ce⁴⁺, Cu²⁺ + Ti³⁺ ↔ Cu⁺ + Ti⁴⁺) play key roles for the superior catalytic deNOₓ performance. ...
DOI:
10.1039/c3cc43041c

35. Copper/TEMPO catalysed synthesis of nitriles from aldehydes or alcohols using aqueous ammonia and with air as the oxidant

Author:
Laura M. Dornan; Qun Cao; James C. A. FlanaganCurrent address: Department of Chemistry, Stanford University, Stanford, CA 94305, USA.; James J. CrawfordCurrent address: Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.; Matthew J. Cook; Mark J. Muldoon
Source:
Chemical communications 2013 v.49 no.54 pp. 6030-6032
ISSN:
1364-548X
Subject:
air; alcohols; aldehydes; ammonia; catalysts; catalytic activity; chemical communication; chemical reactions; nitriles; oxidants; oxygen; temperature
Abstract:
... Copper/TEMPO catalysts can be used to prepare nitriles from aldehydes or alcohols using aqueous ammonia. Readily accessible methods were developed that enable standard glassware to be used with air as the source of O₂. It was further shown that, at higher temperatures in a pressurised reactor under limiting oxygen conditions (8% O₂), catalyst loadings of 1 mol% could be employed. ...
DOI:
10.1039/c3cc42231c

36. Nitrogenase: a general hydrogenator of small molecules

Author:
Ian Dance
Source:
Chemical communications 2013 v.49 no.93 pp. 10893-10907
ISSN:
1364-548X
Subject:
active sites; ammonia; catalysts; catalytic activity; electrons; hydrogenation; iron; nitrogen; nitrogenase; protons; sulfides
Abstract:
... Nitrogenase naturally converts N₂ to NH₃, but it also hydrogenates a variety of small molecules, in many cases requiring multiple electrons plus protons for each catalytic cycle. A general mechanism, arising from many density functional calculations and simulations, is proposed to account for all of these reactions. Protons, supplied serially in conjunction with electrons to the active site FeMo-c ...
DOI:
10.1039/c3cc46864j

37. Plasma driven ammonia decomposition on a Fe-catalyst: eliminating surface nitrogen poisoning

Author:
Li Wang; Yue Zhao; Chunyang Liu; Weimin Gong; Hongchen Guo
Source:
Chemical communications 2013 v.49 no.36 pp. 3787-3789
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical communication; chemical reactions; desorption; gases; iron; isotope labeling; nitrogen; poisoning; spectroscopy
Abstract:
... Strongly adsorbed N atoms inhibit the ammonia decomposition reaction rate. Plasma-driven catalysis can solve this problem and increase the ammonia conversion from 7.8% to 99.9%. ¹⁵NH₃ isotope tracing and optical emission spectroscopy show that gas-phase active species (NH₃*, NH˙) in the plasma zone facilitate the desorption step by an Eley–Rideal (E–R) interaction. ...
DOI:
10.1039/c3cc41301b

38. In situ synthesis of 3D flower-like NiMnFe mixed oxides as monolith catalysts for selective catalytic reduction of NO with NH₃

Author:
Hongrui Li; Dengsong Zhang; Phornphimon Maitarad; Liyi Shi; Ruihua Gao; Jianping Zhang; Weiguo Cao
Source:
Chemical communications 2012 v.48 no.86 pp. 10645-10647
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical communication; chemical reduction; hot water treatment; nitric oxide
Abstract:
... Novel 3D flower-like NiMnFe mixed oxides as monolith catalysts prepared by an in situ hydrothermal method show enhanced performance for the selective catalytic reduction of NO with NH₃. ...
DOI:
10.1039/c2cc34758j

39. ZIF-8 immobilized nickel nanoparticles: highly effective catalysts for hydrogen generation from hydrolysis of ammonia borane

Author:
Pei-Zhou Li; Kengo Aranishi; Qiang Xu
Source:
Chemical communications 2012 v.48 no.26 pp. 3173-3175
ISSN:
1364-548X
Subject:
ambient temperature; ammonia; catalysts; catalytic activity; coordination compounds; durability; hydrogen production; hydrolysis; nanoparticles; nickel
Abstract:
... Highly dispersed Ni nanoparticles have been successfully immobilized by the zeolitic metal–organic framework ZIF-8 via sequential deposition–reduction methods, which show high catalytic activity and long durability for hydrogen generation from hydrolysis of aqueous ammonia borane (NH₃BH₃) at room temperature. ...
DOI:
10.1039/c2cc17302f

40. A DFT investigation of the potential of porous cages for the catalysis of ammonia borane dehydrogenation

Author:
Amrita Pal; Kumar Vanka
Source:
Chemical communications 2011 v.47 no.41 pp. 11417-11419
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical communication; dehydrogenation; phosphorus; quantum mechanics
Abstract:
... Full DFT based quantum mechanical studies reveal that zero dimensional porous structures, especially the newly proposed phosphorus incorporated organic cages, can be excellent catalysts for the dehydrogenation of ammonia borane. ...
DOI:
10.1039/c1cc13285g

41. Hydrothermal stability enhancement by sequential ion-exchange of rare earth metals on Fe/BEA zeolites used as NO reduction catalysts

Author:
Masaoki Iwasaki; Hirofumi Shinjoh
Source:
Chemical communications 2011 v.47 no.13 pp. 3966-3968
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; cations; chemical reduction; ion exchange; iron; nitric oxide; zeolites
Abstract:
... An addition of rare earth metals with trivalent cation radii of 1.05–1.15 Å to Fe/BEA zeolites improves hydrothermal stability for selective catalytic reduction of NO by NH₃. ...
DOI:
10.1039/c1cc00108f

42. Novel cerium–tungsten mixed oxide catalyst for the selective catalytic reduction of NOₓ with NH₃

Author:
Wenpo Shan; Fudong Liu; Hong He; Xiaoyan Shi; Changbin Zhang
Source:
Chemical communications 2011 v.47 no.28 pp. 8046-8048
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical precipitation; chemical reduction; nitrogen oxides
Abstract:
... A novel Ce–W mixed oxide catalyst prepared by homogeneous precipitation method presented nearly 100% NOₓ conversion in a wide temperature range from 250 to 425 °C for the selective catalytic reduction of NOₓ with NH₃ under an extremely high GHSV of 500 000 h⁻¹. ...
DOI:
10.1039/c1cc12168e

43. Transition metal catalysed dehydrogenation of amine-borane fuel blends

Author:
Sib Sankar Mal; Frances H. Stephens; R. Tom Baker
Source:
Chemical communications 2011 v.47 no.10 pp. 2922-2924
ISSN:
1364-548X
Subject:
amines; ammonia; boranes; catalysts; catalytic activity; dehydrogenation; fuels; hydrogen; ionic liquids
Abstract:
... Mixtures containing ammonia-borane and sec-butylamine-borane remain liquid throughout the hydrogen release process that affords tri(N-sec-butyl)borazine and polyborazylene. Concentrated solutions with metal catalysts afford >5 wt% H₂ in 1 h at 80 °C and addition of (EMIM)EtSO₄ ionic liquid co-solvent eliminates competing formation of insoluble linear poly(aminoborane) (EMIM = 1-ethyl-3-methyl-imid ...
DOI:
10.1039/c0cc03585h

44. d-Glucosamine as a green ligand for copper catalyzed synthesis of primary aryl amines from aryl halides and ammonia

Author:
Krishna Gopal Thakur; Dhandapani Ganapathy; Govindasamy Sekar
Source:
Chemical communications 2011 v.47 no.17 pp. 5076-5078
ISSN:
1364-548X
Subject:
ammonia; aniline; catalysts; catalytic activity; chemical reactions; copper; glucosamine; ligands; organic halogen compounds
Abstract:
... Replacing conventional reagents with environment friendly reagents is one of the primary goals of modern synthetic methodology and in this very primitive study about utilizing green, naturally available carbohydrate molecules as ligands in transition metal catalyzed reactions, we report Cu/d-glucosamine as an efficient catalyst for aniline synthesis. ...
DOI:
10.1039/c1cc10568j

45. Efficient copper-catalyzed coupling of aryl chlorides, bromides and iodides with aqueous ammonia

Author:
Hanhui Xu; Christian Wolf
Source:
Chemical communications 2009 v. no.21 pp. 3035-3037
ISSN:
1364-548X
Subject:
additives; ammonia; bromides; catalysts; catalytic activity; chemical reactions; copper; iodides; ligands; organochlorine compounds; solvents
Abstract:
... The copper(i)-catalyzed synthesis of a range of primary anilines from electron-rich and electron-deficient aryl halides including aryl chlorides has been achieved with aqueous ammonia, avoiding the need for inert atmosphere, expensive catalysts and ligands, anhydrous solvents, and additional base or other additives. ...
DOI:
10.1039/b904188e

46. NiO–polyoxometalate nanocomposites as efficient catalysts for the oxidative dehydrogenation of propane and isobutane

Author:
Qinghong Zhang; Chuanjing Cao; Ting Xu; Miao Sun; Jizhe Zhang; Ye Wang; Huilin Wan
Source:
Chemical communications 2009 v. no.17 pp. 2376-2378
ISSN:
1364-548X
Subject:
adsorption; ammonia; butanes; catalysts; catalytic activity; chemical communication; dehydrogenation; nanocomposites; nickel oxide; oxygen; particle size; propane
Abstract:
... Novel nanocomposites of NiO and polyoxometalate (Cs₂.₅H₀.₅PMo₁₂O₄₀) with particle sizes in the range of 5–10 nm showed exceptional oxygen and ammonia adsorption capabilities, and the nanocomposites catalyzed the oxidative dehydrogenation of propane and isobutane efficiently under mild conditions. ...
DOI:
10.1039/b823369a

47. Novel iron titanate catalyst for the selective catalytic reduction of NO with NH₃ in the medium temperature range

Author:
Fudong Liu; Hong He; Changbin Zhang
Source:
Chemical communications 2008 v. no.17 pp. 2043-2045
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; coprecipitation; crystallites; durability; iron; nitric oxide; sulfur dioxide; temperature
Abstract:
... An iron titanate catalyst with a crystallite phase, prepared by a co-precipitation method, showed excellent activity, stability, selectivity and SO₂/H₂O durability in the selective catalytic reduction of NO with NH₃ in the medium temperature range. ...
DOI:
10.1039/b800143j

48. WO₃/CeO₂-ZrO₂, a promising catalyst for selective catalytic reduction (SCR) of NOₓ with NH₃ in diesel exhaust

Author:
Ye Li; Hao Cheng; Deyi Li; Yongsheng Qin; Yuming Xie; Shudong Wang
Source:
Chemical communications 2008 v. no.12 pp. 1470-1472
ISSN:
1364-548X
Subject:
ammonia; carbon dioxide; catalysts; catalytic activity; chemical reactions; nitric oxide; nitrogen dioxide; temperature; tungsten oxide
Abstract:
... A WO₃/CeO₂-ZrO₂ catalyst system was discovered for selective catalytic reduction of NOₓ with NH₃; the catalyst (10 wt% WO₃ loading) showed nearly 100% NOₓ conversion in a temperature range of 200–500 °C, at a space velocity of 90 000 h⁻¹ in a simulated diesel exhaust containing 550 ppm NOₓ (NO : NO₂ feed ratio at 1.0), 10 vol% H₂O and 10 vol% CO₂; the catalyst also exhibited high temperature stabi ...
DOI:
10.1039/b717873e

49. 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

50. Fe–Ce–ZSM-5 a new catalyst of outstanding properties in the selective catalytic reduction of NO with NH₃

Author:
G. Carja; G. Delahay; C. Signorile; B. Coq
Source:
Chemical communications 2004 v. no.12 pp. 1404-1405
ISSN:
1364-548X
Subject:
ammonia; catalysts; catalytic activity; chemical reactions; nitric oxide; sulfur dioxide; temperature
Abstract:
... A Fe–Ce–ZSM-5 catalyst elaborated from a new synthesis route exhibits very high NO conversion (75–100%) in the selective catalytic reduction of NO by NH₃ in a wide temperature window (523–823 K), even in the presence of H₂O and SO₂. ...
DOI:
10.1039/b402660h