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You searched for: Publication year rev 7986-2014 Remove constraint Publication year rev: 7986-2014 Subject term dehydrogenation Remove constraint Subject term: dehydrogenation Subject term catalysts Remove constraint Subject term: catalysts Subject term catalytic activity Remove constraint Subject term: catalytic activity Text availability Citation in PubAg Remove constraint Text availability: Citation in PubAg
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1. A few-layer graphene–graphene oxide composite containing nanodiamonds as metal-free catalysts

Author:
Tung Tran Thanh; Housseinou Ba; Lai Truong-Phuoc; Jean-Mario Nhut; Ovidiu Ersen; Dominique Begin; Izabela Janowska; Dinh Lam Nguyen; Pascal Granger; Cuong Pham-Huu
Source:
Journal of materials chemistry A 2014 v.2 no.29 pp. 11349-11357
ISSN:
2050-7496
Subject:
aqueous solutions; catalysts; catalytic activity; dehydrogenation; ethylbenzene; graphene; graphene oxide; nanodiamonds; sonication; styrene; surfactants
Abstract:
... We report a high yield exfoliation of few-layer-graphene (FLG) with up to 17% yield from expanded graphite, under 5 h sonication time in water, using graphene oxide (GO) as a surfactant. The aqueous dispersion of GO attached FLG (FLG–GO), with less than 5 layers, is used as a template for further decoration of nanodiamonds (NDs). The hybrid materials were self-organized into 3D-laminated nanostruc ...
DOI:
10.1039/c4ta01307g

2. Amine-Capped Co Nanoparticles for Highly Efficient Dehydrogenation of Ammonia Borane

Author:
Hu Jiantong; Chen Zhongxin; Li Mengxiong; Zhou Xiaohui; Lu Hongbin
Source:
ACS Applied Materials & Interfaces 2014 v.6 no.15 pp. 13191-13200
ISSN:
1944-8252
Subject:
activation energy; ammonia; catalysts; catalytic activity; cobalt; dehydrogenation; energy; graphene oxide; ligands; nanoparticles; polyethyleneimine; synergism
Abstract:
... Highly efficient heterogeneous catalysts are desired for the development of new energy storage materials. The rational choice and use of capping ligands are of significant importance for performance optimization of metal nanoparticle (NP) catalysts. By exploiting amine-rich polyethylenimine (PEI) and graphene oxide (GO) as a NP support, we demonstrate that as a capping ligand, PEI deposited on GO ...
DOI:
10.1021/am503037k

3. Automated identification of energetically feasible mechanisms of complex reaction networks in heterogeneous catalysis: application to glycerol conversion on transition metals

Author:
Srinivas Rangarajan; Robert R. O. Brydon; Aditya Bhan; Prodromos Daoutidis
Source:
Green chemistry 2014 v.16 no.2 pp. 813-823
ISSN:
1463-9270
Subject:
Gibbs free energy; automation; catalysts; catalytic activity; cleavage (chemistry); dehydrogenation; glycerol; green chemistry; palladium; platinum; propane; rhodium; ruthenium; synthesis gas
Abstract:
... An automated method is presented to identify energetically feasible mechanisms of heterogeneous catalytic systems comprising of several thousand reactions and species. Specifically, it combines automated rule-based network generation of complex networks with semi-empirical estimation of thermochemical properties to (a) generate large reaction networks, (b) calculate thermochemistry and activation ...
DOI:
10.1039/c3gc41386a

4. CO₂ atmosphere-enhanced methanol aromatization over the NiO-HZSM-5 catalyst

Author:
Junhui Li; Chao Hu; Kai Tong; Hao Xiang; Zhirong Zhu; Zhonghua Hu
Source:
RSC advances 2014 v.4 no.84 pp. 44377-44385
ISSN:
2046-2069
Subject:
X-ray diffraction; acidity; alkanes; aromatization; benzene; carbon dioxide; catalysts; catalytic activity; dehydrogenation; methanol; nickel oxide; nitrogen; olefin; toluene; xylene
Abstract:
... The aromatization of methanol over parent HZSM-5 and the modified NiO-HZSM-5 in a fixed-bed reactor was investigated under CO₂ and N₂ flow. The as-prepared catalysts were characterized by H₂-TPR, XRD, BET, NH₃-TPD, CO₂-TPD and probe-molecule reaction. Compared with parent HZSM-5 in CO₂ or N₂ flow and with NiO-HZSM-5 in N₂ flow, NiO-HZSM-5 showed greatly improved aromatization activity and BTX (ben ...
DOI:
10.1039/c4ra06572g

5. Effective dehydrogenation of 2-pyridylmethanol derivatives catalyzed by an iron complex

Author:
Masahiro Kamitani; Masaki Ito; Masumi Itazaki; Hiroshi Nakazawa
Source:
Chemical communications 2014 v.50 no.59 pp. 7941-7944
ISSN:
1364-548X
Subject:
alcohols; aldehydes; catalysts; catalytic activity; dehydrogenation; hydrogen; iron; ketones
Abstract:
... An unprecedented iron complex-catalyzed dehydrogenation of alcohols was achieved using CpFe(CO)₂Cl with a base or CpFe(CO)(Py)(Ph) as a catalyst without sacrificing the hydrogen acceptors. This reaction effectively (up to TON 67 000) converted 2-pyridylmethanol derivatives to the corresponding ketones or aldehydes. The mechanistic study is also discussed. ...
DOI:
10.1039/c4cc01498g

6. Effects of carbon support on microwave-assisted catalytic dehydrogenation of decalin

Author:
Xing Li; Yongxiao Tuo; Ping Li; Xuezhi Duan; Hao Jiang; Xinggui Zhou
Source:
Carbon 2014 v.67 pp. 775-783
ISSN:
0008-6223
Subject:
bulk density; carbon nanofibers; carbon nanotubes; catalysts; catalytic activity; dehydrogenation; dielectric properties; electrical conductivity; graphene; hydrogen; microwave radiation; microwave treatment; nanoparticles; surface area; thermal properties
Abstract:
... Five types of carbon materials, including carbon nanotubes (CNTs), carbon nanofibres, carbon black, activated carbon and graphite, were evaluated in searching for an appropriate support for a Pt catalyst used for the dehydrogenation of decalin under microwave irradiation (MW). The thermal behaviour of different carbon materials and supported Pt catalysts suspended in decalin under MW was investiga ...
DOI:
10.1016/j.carbon.2013.10.071

7. Fabrication of Pt-loaded NiCo nanochains with superior catalytic dehydrogenation activity

Author:
Ming Wen; Qingnan Wu; Jin Peng; Qingsheng Wu; Chenxiang Wang
Source:
Journal of colloid and interface science 2014 v.416 pp. 220-226
ISSN:
0021-9797
Subject:
activation energy; ambient temperature; ammonia; catalysts; catalytic activity; chemical industry; dehydrogenation; energy; fuels; hydrogen; magnetism; microwave treatment; nanoparticles
Abstract:
... A new magnetic Pt-loaded NiCo nanochain, with the diameter from 80nm to 120nm, has been prepared through microwave-induced assembly process followed by the galvanic displacement performance. Pt nanoparticles are distributed on the surface of NiCo nanochains. The products are investigated as hydrolytic dehydrogenation catalyst for potential hydrogen energy applications. Compared with NiCo nanochain ...
DOI:
10.1016/j.jcis.2013.10.056

8. Hydroxyapatite-nanosphere supported ruthenium(0) nanoparticle catalyst for hydrogen generation from ammonia-borane solution: kinetic studies for nanoparticle formation and hydrogen evolution

Author:
Halil Durak; Mehmet Gulcan; Mehmet Zahmakiran; Saim Ozkar; Murat Kaya
Source:
RSC advances 2014 v.4 no.55 pp. 28947-28955
ISSN:
2046-2069
Subject:
ambient temperature; analytical methods; catalysts; catalytic activity; dehydrogenation; hydrogen; hydrogen production; hydroxyapatite; ions; monitoring; nanoparticles; nanospheres; ruthenium
Abstract:
... The development of readily prepared effective heterogeneous catalysts for hydrogen generation from ammonia-borane (AB; NH₃BH₃) solution under mild conditions still remains a challenge in the field of “hydrogen economy”. In this study, we report our finding of an in situ generated, highly active ruthenium nanocatalyst for the dehydrogenation of ammonia-borane in water at room temperature. The new c ...
DOI:
10.1039/c4ra03213f

9. Metal-catalyst-free growth of carbon nanotubes/carbon nanofibers on carbon blacks using chemical vapor deposition

Author:
Zhi-Yan Zeng; Jarrn-Horng Lin
Source:
RSC advances 2014 v.4 no.76 pp. 40251-40258
ISSN:
2046-2069
Subject:
acetylene; activation energy; carbon; carbon nanofibers; carbon nanotubes; catalysts; catalytic activity; cyclohexanes; dehydrogenation; ethanol; ethylene; models; soot; temperature; vapors
Abstract:
... Metal-catalyst-free growth of carbon nanostructures, e.g. carbon nanotubes (CNTs) or carbon nanofibers (CNFs), on typical materials is a promising route to achieve further applications without interference of unwanted metal catalysts. Here, we report that carbon black (CB) can act as a catalyst to controllably grow CNTs or CNFs yielding bi-functional hybrid structure-CNTs/CB or CNFs/CB through a m ...
DOI:
10.1039/c4ra03456b

10. Oxidative Dehydrogenation of Ethane to Ethylene over V2O5/Al2O3 Catalysts: Effect of Source of Alumina on the Catalytic Performance

Author:
Qiao A.; Kalevaru V. N.; Radnik J.; Düvel A.; Heitjans P.; Kumar A. Sri Hari; Prasad P. S. Sai; Lingaiah N.; Martin A.
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.49 pp. 18711-18721
ISSN:
1520-5045
Subject:
aluminum; aluminum oxide; catalysts; catalytic activity; crystallites; dehydrogenation; engineering; ethane; ethylene; quartz; temperature; vanadium
Abstract:
... A series of V₂O₅/Al₂O₃ catalysts with fixed V₂O₅ content (10 wt %) but varying Al₂O₃ supports were prepared by impregnation technique and tested for the oxidative dehydrogenation of ethane (ODHE) to ethylene in a fixed bed quartz reactor in the temperature range from 500 to 600 °C. The nature of alumina support applied had a significant influence on the catalytic performance. Among all alumina sup ...
DOI:
10.1021/ie5008344

11. Oxidative dehydrogenation of ethane: A study over the structure and robustness of Ni–W–O catalysts

Author:
S. Agouram; A. Dejoz; F. Ivars; I. Vázquez; J.M. López Nieto; B. Solsona
Source:
Fuel processing technology 2014 v.119 pp. 105-113
ISSN:
0378-3820
Subject:
air; catalysts; catalytic activity; dehydrogenation; ethane; hydrogen; methane; nickel; nickel oxide
Abstract:
... The robustness of one selected Ni–W–O catalyst has been studied in the oxidative dehydrogenation of ethane. This catalyst initially deactivates for the first 10h online decreasing 15% of its catalytic activity compared to its initial stable catalytic activity. However from 10 to 60h online the catalytic activity keeps almost stable. On the other hand, it has been shown that the Ni–W–O catalyst can ...
DOI:
10.1016/j.fuproc.2013.10.017

12. Practical synthesis of pyrazoles via a copper-catalyzed relay oxidation strategy

Author:
Xiaodong Tang; Liangbin Huang; Jidan Yang; Yanli Xu; Wanqing Wu; Huanfeng Jiang
Source:
Chemical communications 2014 v.50 no.94 pp. 14793-14796
ISSN:
1364-548X
Subject:
acetates; aldehydes; amines; catalysts; catalytic activity; chemical bonding; cleavage (chemistry); copper; dehydrogenation; moieties; oxidants; oxidation; pyrazoles
Abstract:
... Various 1,3- and 1,3,4-substituted pyrazoles are smoothly formed via copper-catalyzed cascade reactions of oxime acetates, amines and aldehydes. This relay oxidative process involves copper-promoted N–O bond cleavage and C–C/C–N/N–N bond formations to furnish pyrazolines, and sequential Cu–O₂ system-involved oxidative dehydrogenation of pyrazolines to afford pyrazoles. This transformation provides ...
DOI:
10.1039/c4cc06747a

13. Preparation of NiNbO/AISI 430 Ferritic Stainless Steel Monoliths for Catalytic Applications

Author:
Santander J. A.; López E.; Tonetto G. M.; Pedernera M. N.
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.28 pp. 11312-11319
ISSN:
1520-5045
Subject:
catalysts; catalytic activity; dehydrogenation; engineering; ethane; ethylene; slurries; stainless steel; surface roughness; temperature
Abstract:
... AISI 430 ferritic stainless steel was used as a substrate to make catalytic monolithic structures. To increase the surface roughness of the substrate, the steel was oxidized at temperatures in the range of 900–940 °C and times in the range of 30–120 min. The oxide layer formed was characterized. Treatment at 940 °C for 60 min was found to be optimal for obtaining a Cr-rich rough oxide layer, with ...
DOI:
10.1021/ie501884g

14. Revealing the ameliorating effect of chromium oxide on a carbon nanotube catalyst in propane oxidative dehydrogenation

Author:
Fei Ma; Shu Chen; Hang Zhou; Yanhua Li; Weimin Lu
Source:
RSC advances 2014 v.4 no.77 pp. 40776-40781
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; active sites; carbon nanotubes; catalysts; catalytic activity; chromic oxide; chromium; dehydrogenation; desorption; oxygen; propane; propylene; synergism
Abstract:
... Oxygenized multi-walled carbon nanotubes were modified with chromium oxide and applied in propane oxidative dehydrogenation. A propylene selectivity of 84.0% was obtained at a propane conversion of 19.8% on a Cr-1.5 wt% sample. The beneficial effect of chromium was studied by integrated techniques. X-ray photoelectron spectroscopy, and FT-IR results show that surface oxygen groups were greatly opt ...
DOI:
10.1039/c4ra03672g

15. Significantly improved kinetics, reversibility and cycling stability for hydrogen storage in NaAlH₄ with the Ti-incorporated metal organic framework MIL-125(Ti)

Author:
Xin Zhang; Yongfeng Liu; Yuepeng Pang; Mingxia Gao; Hongge Pan
Source:
Journal of materials chemistry A 2014 v.2 no.6 pp. 1847-1854
ISSN:
2050-7496
Subject:
activation energy; additives; catalysts; catalytic activity; coordination polymers; dehydrogenation; desorption; hydrogen; nanopores; reaction kinetics; temperature
Abstract:
... A well-crystallized Ti-incorporated metal organic framework, MIL-125(Ti), synthesized using a solvothermal method, was introduced into NaAlH₄ as the catalyst precursor to improve the dehydrogenation–hydrogenation kinetics. Adding 5 wt% MIL-125(Ti) dramatically decreased the operating temperatures and improved the reaction kinetics for hydrogen storage in NaAlH₄. The starting temperature for hydrog ...
DOI:
10.1039/c3ta14202g

16. Size-Dependent Catalytic Activity of Supported Vanadium Oxide Species: Oxidative Dehydrogenation of Propane

Author:
Rozanska Xavier; Fortrie Remy; Sauer Joachim
Source:
Journal of the American Chemical Society 2014 v.136 no.21 pp. 7751-7761
ISSN:
1520-5126
Subject:
catalysts; catalytic activity; dehydrogenation; energy; hydrogen; methodology; propane; propylene; silica; uncertainty; vanadium
Abstract:
... Possible reaction pathways for the oxidative dehydrogenation of propane by vanadium oxide catalysts supported on silica are examined by density functional theory. Monomeric and dimeric vanadium oxide species are both considered and modeled by vanadyl-substituted silsesquioxanes. The reaction proceeds in two subsequent steps. In a first step, hydrogen abstraction from propane by a vanadyl (OV) gro ...
DOI:
10.1021/ja503130z

17. Titania-catalysed oxidative dehydrogenation of ethyl lactate: effective yet selective free-radical oxidation

Author:
Enrique V. Ramos-Fernandez; Norbert J. Geels; N. Raveendran Shiju; Gadi Rothenberg
Source:
Green chemistry 2014 v.16 no.6 pp. 3358-3363
ISSN:
1463-9270
Subject:
activated carbon; byproducts; catalysts; catalytic activity; ceric oxide; dehydrogenation; ferric oxide; free radicals; green chemistry; lactic acid; oxidants; oxidation; oxygen; pyruvic acid; solvents; titanium dioxide; zinc oxide; zirconium oxide
Abstract:
... We research here the catalytic oxidative dehydrogenation of ethyl lactate, as an alternative route to ethyl pyruvate. Testing various solid catalysts (Fe₂O₃, TiO₂, V₂O₅/MgO–Al₂O₃, ZrO₂, CeO₂ and ZnO), we find that simple and inexpensive TiO₂ efficiently catalyses this reaction under mild conditions. Furthermore, molecular oxygen was used as the terminal oxidant. Importantly, this reaction runs wel ...
DOI:
10.1039/c4gc00191e

18. 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

19. sp³C–H bond alkylation of ketones with alkenes via ruthenium(ii) catalysed dehydrogenation of alcohols

Author:
Bin Li; Christophe Darcel; Pierre H. Dixneuf
Source:
Chemical communications 2014 v.50 no.45 pp. 5970-5972
ISSN:
1364-548X
Subject:
alcohols; alkenes; alkylation; aromatic hydrocarbons; catalysts; catalytic activity; copper; dehydrogenation; ketones; ruthenium
Abstract:
... The sp³C–H bond functionalisation of 2-pyridyl ethanols upon reaction with alkenes, in the presence of a [RuCl₂(arene)]₂ catalyst and Cu(OAc)₂·H₂O, is performed under mild conditions without additional base. This reaction proceeds via a tandem alcohol dehydrogenation/alkylation with alkenes of the resulting ketone at its α sp³C–H bond. ...
DOI:
10.1039/c4cc00931b

20. A green chemistry approach to styrene from ethylbenzene and air on MnₓTi₁₋ₓO₂ catalyst

Author:
Sanjay Singh Negi; Aswathy Thareparambil Venugopalan; Thirumalaiswamy Raja; Anand Pal Singh; Chinnakonda S. Gopinath
Source:
RSC advances 2014 v.4 no.100 pp. 57087-57097
ISSN:
2046-2069
Subject:
X-ray diffraction; air; catalysts; catalytic activity; combustion; dehydrogenation; ethylbenzene; green chemistry; manganese; manganese oxides; oxidants; oxygen; sorption isotherms; styrene; temperature; titanium dioxide; transmission electron microscopy
Abstract:
... Styrene (ST) is an industrially important commodity chemical, and design of a suitable catalyst, which provides high ethyl benzene (EB) conversion and styrene selectivity at lower temperature with sustainable activity, is one of the major challenges in the field of heterogeneous catalysis. Manganese incorporated in titania (MnₓTi₁₋ₓO₂) anatase lattice, prepared via the solution combustion method, ...
DOI:
10.1039/c4ra11814f

21. A nanodiamond/CNT–SiC monolith as a novel metal free catalyst for ethylbenzene direct dehydrogenation to styrene

Author:
Hongyang Liu; Jiangyong Diao; Qi Wang; Songyuan Gu; Tong Chen; Changxi Miao; Weimin Yang; Dangsheng Su
Source:
Chemical communications 2014 v.50 no.58 pp. 7810-7812
ISSN:
1364-548X
Subject:
catalysts; catalytic activity; dehydrogenation; ethylbenzene; nanodiamonds; styrene
Abstract:
... A novel nanodiamond/CNT–SiC monolith catalyst has been prepared by a facile two-step approach. The as-synthesized monolith afforded high activity and stability for ethylbenzene direct dehydrogenation to styrene, showing its potential application as a metal free catalyst in gaseous catalytic reactions. ...
DOI:
10.1039/c4cc01693a

22. Acceptorless dehydrogenative synthesis of 2-substituted quinazolines from 2-aminobenzylamine with primary alcohols or aldehydes by heterogeneous Pt catalysts

Author:
Chandan Chaudhari; S. M. A. Hakim Siddiki; Masazumi Tamura; Ken-ichi Shimizu
Source:
RSC advances 2014 v.4 no.95 pp. 53374-53379
ISSN:
2046-2069
Subject:
alcohols; aldehydes; amines; catalysts; catalytic activity; dehydrogenation; nanoparticles; platinum
Abstract:
... CeO₂-supported Pt nanoparticle catalysts enabled the acceptorless dehydrogenative synthesis of 2-substituted quinazolines from 2-aminobenzylamine with aliphatic and benzyl primary alcohols or aldehydes with low catalyst loading, wide substrate scope and good catalyst reusability, demonstrating the first acceptor-free and additive-free catalytic system for this reaction. ...
DOI:
10.1039/c4ra09205h

23. AgPd nanoparticles supported on MIL-101 as high performance catalysts for catalytic dehydrogenation of formic acid

Author:
Hongmei Dai; Nan Cao; Lan Yang; Jun Su; Wei Luo; Gongzhen Cheng
Source:
Journal of materials chemistry A 2014 v.2 no.29 pp. 11060-11064
ISSN:
2050-7496
Subject:
catalysts; catalytic activity; coordination polymers; dehydrogenation; formic acid; hydrogen; nanoparticles; palladium; silver
Abstract:
... Bimetallic AgPd nanoparticles were successfully immobilized into the metal–organic frameworks (MIL-101), and tested for their catalytic dehydrogenation of formic acid. These catalysts were composition dependent for the catalytic activity. Among all the AgPd@MIL-101 catalysts tested, the Ag₂₀Pd₈₀@MIL-101 catalyst exhibits the highest catalytic activity for the conversion of formic acid to high-qual ...
DOI:
10.1039/c4ta02066a

24. An efficient robust fluorite CeZrO₄₋δ oxide catalyst for the eco-benign synthesis of styrene

Author:
Kaliyappan Periyasamy; Venugopalan T. Aswathy; Venugopal Ashok kumar; Marimuthu Manikandan; Rakesh Shukla; Avesh K. Tyagi; Thirumalaiswamy Raja
Source:
RSC advances 2014 v.5 no.5 pp. 3619-3626
ISSN:
2046-2069
Subject:
air; carbon dioxide; catalysts; catalytic activity; ceric oxide; dehydrogenation; oxidants; oxygen; styrene; temperature; zirconium oxide
Abstract:
... In this work, we have reported CeO₂, ZrO₂, physically mixed (PH)-CeO₂/ZrO₂ and fluorite CeZrO₄₋δ oxides and their catalytic activities for the oxidative dehydrogenation (ODH) of ethyl benzene (EB) to styrene (ST) using molecular oxygen, air and carbon dioxide as oxidants. The catalysts were prepared by a gel-combustion method followed by calcination at 600 °C for 6 h and subjected to catalytic act ...
DOI:
10.1039/c4ra12355g

25. Catalytic dehydrogenation of isobutane over Co-based catalysts

Author:
Guowei Wang; Xiaolin Zhu; Jiaoyu Zhang; Yanan Sun; Chunyi Li; Honghong Shan
Source:
RSC advances 2014 v.4 no.100 pp. 57071-57082
ISSN:
2046-2069
Subject:
acidity; active sites; aluminum oxide; binding capacity; butanes; catalysts; catalytic activity; cobalt; copper; dehydrogenation; hydrogen; silica; temperature; tin
Abstract:
... In this work, to optimize the catalytic performance of Co-based catalysts for isobutane dehydrogenation, the effects of support, calcination temperature and some promoters were investigated systematically. Results of activity tests and catalyst characterization jointly indicated that both the support and calcination temperature influenced Co dispersion, catalyst acid properties and the interaction ...
DOI:
10.1039/c4ra08849b

26. Catalytic performance of Mo₂C supported on onion-like carbon for dehydrogenation of cyclohexane

Author:
Jianping Du; Jinting Wu; Tianyu Guo; Ruihua Zhao; Jinping Li
Source:
RSC advances 2014 v.4 no.96 pp. 53950-53953
ISSN:
2046-2069
Subject:
X-ray diffraction; activated carbon; catalysts; catalytic activity; cyclohexanes; dehydrogenation; energy-dispersive X-ray analysis; fullerene; hydrogen production; molybdenum; transmission electron microscopy
Abstract:
... Mo₂C is a promising substitute for noble metal catalysts. Mo₂C unsupported and supported on carbon (Mo₂C/C) including activated carbon (AC) and onion-like carbon (OLC) was used for hydrogen production. The activity and stability of the Mo₂C based catalysts in the dehydrogenation of cyclohexane were studied. The onion-like carbon supported Mo₂C catalyst (Mo₂C/OLC) was characterized by XRD, TEM and ...
DOI:
10.1039/c4ra08238a

27. Core–shell Co@C catalyzed MgH₂: enhanced dehydrogenation properties and its catalytic mechanism

Author:
Ying Wang; Cuihua An; Yijing Wang; Yanan Huang; Chengcheng Chen; Lifang Jiao; Huatang Yuan
Source:
Journal of materials chemistry A 2014 v.2 no.38 pp. 16285-16291
ISSN:
2050-7496
Subject:
activation energy; annealing; carbon; catalysts; catalytic activity; cobalt; dehydrogenation; hydrogen; nitrogen; porosity; sorption; surface area; temperature; thermal conductivity
Abstract:
... An efficient core–shell Co@C catalyst is synthesized through a solvothermal and subsequent annealing process. The as-synthesized Co@C consists of an 11 nm Co core and a 3 nm amorphous carbon shell. Nitrogen sorption isothermals show that Co@C has a surface area of 112.6 m² g⁻¹ and a typical pore size of 4.8 nm. The catalytic effects of core–shell Co@C, which can significantly improve the dehydroge ...
DOI:
10.1039/c4ta02759k

28. Effects of CeO2 support facets on VOx/CeO2 catalysts in oxidative dehydrogenation of methanol

Author:
Yan Li; Zhehao Wei; Feng Gao; Libor Kovarik; Charles H.F. Peden; Yong Wang
Source:
Journal of catalysis 2014 v.315 pp. 15-24
ISSN:
0021-9517
Subject:
activation energy; catalysts; catalytic activity; ceric oxide; dehydrogenation; energy; methanol; models; nanorods; oxygen; spectral analysis; vanadium
Abstract:
... CeO2 supports with dominating facets, i.e., low index (100), (110) and (111) facets, are prepared. The facet effects on the structure and catalytic performance of supported vanadium oxide catalysts are investigated using oxidative dehydrogenation of methanol as a model reaction. In the presence of mixed facets, Infrared and Raman characterizations demonstrate that surface vanadia species preferent ...
DOI:
10.1016/j.jcat.2014.04.013

29. Effects of metal and acidic sites on the reaction by-products of butyl acetate oxidation over palladium-based catalysts

Author:
Lin Yue; Chi He; Zhengping Hao; Shunbing Wang; Hailin Wang
Source:
Journal of Environmental Sciences 2014 v.26 pp. 702-707
ISSN:
1001-0742
Subject:
X-radiation; acetates; acetic acid; acidity; ammonia; byproducts; carbon dioxide; catalysts; catalytic activity; cracking; dehydrogenation; desorption; fluorescence; gas chromatography; hexane; hydrogen; isomerization; mass spectrometry; oxidation; pentane; pollution control; temperature; volatile organic compounds
Abstract:
... Catalytic oxidation is widely used in pollution control technology to remove volatile organic compounds. In this study, Pd/ZSM-5 catalysts with different Pd contents and acidic sites were prepared via the impregnation method. All the catalysts were characterized by means of N2 adsorption-desorption, X-ray fluorescence (XRF), H2 temperature programmed reduction (H2-TPR), and NH3 temperature program ...
DOI:
10.1016/S1001-0742(13)60439-8

30. Enhanced hydrogen storage properties of LiAlH₄ catalyzed by CoFe₂O₄ nanoparticles

Author:
Ziliang Li; Fuqiang Zhai; Qi Wan; Zhaojiang Liu; Jiawei Shan; Ping Li; Alex A. Volinsky; Xuanhui Qu
Source:
RSC advances 2014 v.4 no.36 pp. 18989-18997
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; activation energy; catalysts; catalytic activity; cobalt; dehydrogenation; desorption; differential scanning calorimetry; hydrogen; iron; milling; nanoparticles; temperature
Abstract:
... The catalytic effects of CoFe₂O₄ nanoparticles on the hydrogen storage properties of LiAlH₄ prepared by ball milling were investigated. The onset desorption temperature of the LiAlH₄ + 2 mol% CoFe₂O₄ sample is 65 °C, which is 90 °C lower that of the as-received LiAlH₄, with approximately 7.2 wt% hydrogen released at 250 °C. The isothermal desorption results show that for the 2 mol% CoFe₂O₄ doped s ...
DOI:
10.1039/c4ra00841c

31. Facile in situ synthesis of copper nanoparticles supported on reduced graphene oxide for hydrolytic dehydrogenation of ammonia borane

Author:
Yuwen Yang; Zhang-Hui Lu; Yujuan Hu; Zhujun Zhang; Weimei Shi; Xiangshu Chen; Tingting Wang
Source:
RSC advances 2014 v.4 no.27 pp. 13749-13752
ISSN:
2046-2069
Subject:
ammonia; catalysts; catalytic activity; copper nanoparticles; dehydrogenation; graphene oxide; hydrogen; reducing agents
Abstract:
... Reduced graphene oxide (RGO) supported copper nanoparticles (NPs) were synthesized via a facile in situ procedure using ammonia borane (AB) as a reductant. The as-prepared nanocatalysts exert satisfactory catalytic activity (3.61 mol H₂ mol per catalyst per min), and appear to be the best Cu nanocatalysts up to now for the dehydrogenation of ammonia borane. ...
DOI:
10.1039/c3ra47023g

32. Insights into gold-catalyzed synthesis of azelaic acid

Author:
Anna Kulik; Andreas Martin; Marga-Martina Pohl; Christine Fischer; Angela Köckritz
Source:
Green chemistry 2014 v.16 no.4 pp. 1799-1806
ISSN:
1463-9270
Subject:
catalysts; catalytic activity; dehydrogenation; gold; green chemistry; isotope labeling; oxygen; pelargonic acid; reaction mechanisms; sodium hydroxide; stable isotopes; storage conditions
Abstract:
... A novel green route for the synthesis of azelaic and pelargonic acid via aerobic gold-catalyzed cleavage of 9,10-dihydroxystearic acid (DSA) was investigated recently. In this study, the examination of the reaction mechanism is described. The results of the application of ¹⁸O-labeled molecular oxygen and sodium hydroxide as well as of diastereomeric pure erythro- and threo-DSA were discussed. Assu ...
DOI:
10.1039/c3gc41822g

33. Kinetic Study of Oxidative Dehydrogenation of Ethane over MoVTeNb Mixed-Oxide Catalyst

Author:
Valente Jaime S.; Quintana-Solórzano R.; Armendáriz-Herrera H.; Barragán-Rodríguez G.; López-Nieto J. M.
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.5 pp. 1775-1786
ISSN:
1520-5045
Subject:
atmospheric pressure; catalysts; catalytic activity; dehydrogenation; engineering; ethane; ethylene; ethylene production; experimental design; nitrogen; oxides; oxygen; temperature
Abstract:
... A MoVTeNb multimetallic mixed oxide was studied for the oxidative dehydrogenation of ethane, a promising alternative for catalytic ethylene production. Lab-scale steady-state experimental reaction data were obtained according to a 3ᵏ experimental design to investigate the simultaneous effect of temperature (400–480 °C) and space–time [23–70 gcₐₜ h (mol of ethane)⁻¹]. A fixed-bed reactor at atmosph ...
DOI:
10.1021/ie402447h

34. Nanodiamond/carbon nitride hybrid nanoarchitecture as an efficient metal-free catalyst for oxidant- and steam-free dehydrogenation

Author:
Zhongkui Zhao; Yitao Dai
Source:
Journal of materials chemistry A 2014 v.2 no.33 pp. 13442-13451
ISSN:
2050-7496
Subject:
carbon; carbon nitride; catalysts; catalytic activity; condensation (phase transition); dehydrogenation; ethylbenzene; industrial applications; melamine; nanodiamonds; oxidants; physicochemical properties; porous media; pyrolysis; styrene; synergism; temperature
Abstract:
... Nanodiamond/carbon nitride (ND/CNx) nanoarchitectures with a stacked carbon nitride layer on nanodiamond have been successfully fabricated through a facile pyrolysis approach of pristine nanodiamond and melamine at temperatures of 650, 700, and 750 °C, which challenges the long-held axiom that a CNx layer can only be formed at condensation temperatures of less than 600 °C and it decomposes and ins ...
DOI:
10.1039/c4ta02282c

35. New Formulations of Ni-Containing Ceramic Papers to Enhance the Catalytic Performance for the Oxidative Dehydrogenation of Ethane

Author:
Bortolozzi J. P.; Banús E. D.; Milt V. G.; Miro E. E.
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.45 pp. 17570-17579
ISSN:
1520-5045
Subject:
Raman spectroscopy; X-ray diffraction; active ingredients; catalysts; catalytic activity; ceramics; cerium; colloids; dehydrogenation; engineering; ethane; ethylene; mechanical properties; nanoparticles; nickel; nickel oxide; solid solutions; zirconium
Abstract:
... Ceramic papers composed of silica–alumina fibers structured using colloidal suspensions as binders constitute interesting materials to be used as flexible supports of catalytic materials. The deposition of Ni as the active ingredient together with Zr or Ce promoters resulted in active and selective structured catalysts for the oxidative dehydrogenation of ethane; these structured catalysts also ex ...
DOI:
10.1021/ie503154f

36. Nitrogen-containing carbon nanostructures: A promising carrier for catalysis of ammonia borane dehydrogenation

Author:
Xiaowei Chen; Lei Wan; Jianmei Huang; Liuzhang Ouyang; Min Zhu; Zaiping Guo; Xuebin Yu
Source:
Carbon 2014 v.68 pp. 462-472
ISSN:
0008-6223
Subject:
ammonia; carbon nanotubes; catalysts; catalytic activity; dehydrogenation; graphene; hydrogen; hydrogenation; nitrogen; temperature
Abstract:
... The first-principles calculations demonstrate that nitrogen-containing carbon nanostructures (NCCN), such as nitrogen-doped graphene, nitrogen-doped carbon nanotubes, and covalent triazine-based framework (CTF) are promising metal-free catalysts for the first step dehydrogenation of ammonia borane (AB). It reveals that nitrogen lone pairs in NCCN function as hydrogen acceptors to allow metal-free ...
DOI:
10.1016/j.carbon.2013.11.022

37. Postsynthetic Metalation of Bipyridyl-Containing Metal–Organic Frameworks for Highly Efficient Catalytic Organic Transformations

Author:
Manna Kuntal; Zhang Teng; Lin Wenbin
Source:
Journal of the American Chemical Society 2014 v.136 no.18 pp. 6566-6569
ISSN:
1520-5126
Subject:
catalysts; catalytic activity; chemical bonding; coordination polymers; crystal structure; dehydrogenation; ligands; nitrogen; oxidants; oxygen; phenol
Abstract:
... We have designed highly stable and recyclable single-site solid catalysts via postsynthetic metalation of the 2,2′-bipyridyl-derived metal–organic framework (MOF) of the UiO structure (bpy-UiO). The Ir-functionalized MOF (bpy-UiO-Ir) is a highly active catalyst for both borylation of aromatic C–H bonds using B₂(pin)₂ (pin = pinacolate) and ortho-silylation of benzylicsilyl ethers; the ortho-silyla ...
DOI:
10.1021/ja5018267

38. Propane dehydrogenation over Al2O3 supported Pt nanoparticles: Effect of cerium addition

Author:
Zhanhua Ma; Jun Wang; Jun Li; Ningning Wang; Changhua An; Lanyi Sun
Source:
Fuel Processing Technology 2014 v.128 pp. 283-288
ISSN:
0378-3820
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; aluminum oxide; catalysts; catalytic activity; cerium; dehydrogenation; liquids; nanoparticles; platinum; propane; transmission electron microscopes; transmission electron microscopy; vibration
Abstract:
... The catalyst of Pt nanoparticles loaded on Al2O3 support has been prepared by a facile liquid phase synthesis–ultrasonic vibration method. With propane dehydrogenation as a probe reaction, the influence of promoter cerium (Ce) on the catalyst was investigated by means of transmission electron microscope (TEM), X-ray diffraction (XRD), N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS ...
DOI:
10.1016/j.fuproc.2014.07.031

39. Selective catalytic oxidation of sugar alcohols to lactic acid

Author:
Michael G. Manas; Jesús Campos; Liam S. Sharninghausen; Elisa Lin; Robert H. Crabtree
Source:
Green chemistry 2014 v.17 no.1 pp. 594-600
ISSN:
1463-9270
Subject:
biomass; carbon; catalysts; catalytic activity; dehydrogenation; energy; green chemistry; hydrolysis; lactic acid; oxidation; reaction mechanisms; sorbitol; xylitol
Abstract:
... Sorbitol and xylitol obtained from biomass are considered promising potential sources of both carbon building blocks and energy. We report the efficient and selective conversion of sorbitol, xylitol and other polyols into lactic acid as the major product through homogeneous iridium-NHC catalyzed dehydrogenative processes. The proposed reaction mechanism involves base-driven hydrolysis of simple su ...
DOI:
10.1039/c4gc01694g

40. Support Effect in Oxide Catalysis: Methanol Oxidation on Vanadia/Ceria

Author:
Kropp Thomas; Paier Joachim; Sauer Joachim
Source:
Journal of the American Chemical Society 2014 v.136 no.41 pp. 14616-14625
ISSN:
1520-5126
Subject:
adsorption; catalysts; catalytic activity; ceric oxide; dehydrogenation; desorption; electrons; formaldehyde; heat production; interphase; ions; methanol; methodology; models; oxidation; temperature; vanadium
Abstract:
... Density functional theory is used for periodic models of monomeric vanadia species deposited on the CeO₂(111) surface to study dissociative adsorption of methanol and its subsequent dehydrogenation to formaldehyde. Dispersion-corrected PBE+U calculations are performed and compared with HSE and B3LYP results. Dissociative adsorption of methanol at different sites on VO₂·CeO₂(111) is highly exotherm ...
DOI:
10.1021/ja508657c

41. Synthesis of core–shell-structured SBA-15@MgAl2O 4 with enhanced catalytic performance of propane dehydrogenation

Author:
Shijian Zhou; Yuming Zhou; Yiwei Zhang; Xiaoli Sheng; Zewu Zhang; Jie Kong
Source:
Journal of materials science 2014 v.49 no.3 pp. 1170-1178
ISSN:
0022-2461
Subject:
carbon; catalysts; catalytic activity; dehydrogenation; propane; sol-gel processing; surface area
Abstract:
... Core–shell-structured SBA-15@MgAl₂O₄(abbreviated as S@MA) was prepared by homogeneous precipitation through sol–gel method. The effects on the properties of S@MA as a supporting material have been investigated in comparison with MA and SBA-15. The results showed that the pore structure was changed, the acid sites were introduced, and the surface properties were improved by the construction of the ...
DOI:
10.1007/s10853-013-7797-4

42. Synthesis of magnesium-modified mesoporous Al2O 3 with enhanced catalytic performance for propane dehydrogenation

Author:
Junjun Shi; Yuming Zhou; Yiwei Zhang; Shijian Zhou; Zewu Zhang; Jie Kong; Mingpeng Guo
Source:
Journal of materials science 2014 v.49 no.16 pp. 5772-5781
ISSN:
0022-2461
Subject:
aluminum oxide; catalysts; catalytic activity; dehydrogenation; magnesium; magnesium oxide; propane; tin
Abstract:
... Magnesium (Mg)-modified mesoporous alumina with different type and content of Mg was prepared and then used as the support for platinum-tin catalyst in propane dehydrogenation. It was found that the property of Mg in Al₂O₃varied with the way of the addition of Mg precursors. For the grafted Mg species, the connection between Al₂O₃and Mg was increased by the forming of Mg–O–Al bonds in the inner su ...
DOI:
10.1007/s10853-014-8303-3

43. The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts

Author:
Raoul Naumann d’Alnoncourt; Lénárd-István Csepei; Michael Hävecker; Frank Girgsdies; Manfred E. Schuster; Robert Schlögl; Annette Trunschke
Source:
Journal of catalysis 2014 v.311 pp. 369-385
ISSN:
0021-9517
Subject:
X-ray diffraction; acrolein; acrylic acid; catalysts; catalytic activity; dehydrogenation; desorption; models; oxidation; oxygen; propane; propylene; spectroscopy; steam; temperature; vanadium
Abstract:
... MoVTeNb oxide catalysts exclusively composed of the M1 phase (ICSD No. 55097) have been studied in the direct oxidation of propane to acrylic acid applying a broad range of reaction conditions with respect to temperature (623–633–643–653–663K), O2 concentration in the feed (4.5–6.0–9.0–12.0%), steam concentration in the feed (0–10–20–40%), and contact time (0.06–0.12–0.18–0.24–0.36–0.48–0.72–1.44s ...
DOI:
10.1016/j.jcat.2013.12.008

44. Ultrasmall palladium nanoparticles supported on amine-functionalized SBA-15 efficiently catalyze hydrogen evolution from formic acid

Author:
K. Koh; J.-E. Seo; J. H. Lee; A. Goswami; C. W. Yoon; T. Asefa
Source:
Journal of materials chemistry A 2014 v.2 no.48 pp. 20444-20449
ISSN:
2050-7496
Subject:
ambient temperature; biomass; catalysts; catalytic activity; dehydrogenation; energy; feedstocks; formic acid; fossil fuels; hydrogen; hydrogen production; nanoparticles; nanopores; nonrenewable resources; palladium; renewable resources; toxicity
Abstract:
... The success of the so-called “hydrogen economy” for large-scale applications will ultimately depend on efficient and sustainable production, storage and distribution of hydrogen. Owing to its low toxicity, high volumetric H₂ storage capacity and availability both from renewable resources (e.g., biomass) and non-renewable resources (e.g., fossil fuel feedstocks), formic acid is one of the most favo ...
DOI:
10.1039/c4ta04538f