Effect of an Oxides Composite Support of Ce(Sm)O3-La(Sr)CrO3 on Pd-Ni Alloy for Decomposition Activity of CH4

2010 ◽  
Vol 65 ◽  
pp. 215-224
Author(s):  
Ichiro Yamanaka ◽  
Yuta Nabae ◽  
Takeo Ito
Keyword(s):  
Catalytic Activity ◽  
Spherical Shape ◽  
Open Circuit ◽  
Fiber Formation ◽  
Oxidation Catalysis ◽  
High Catalytic Activity ◽  
Composite Anode ◽  
Composite Support ◽  
Ni Alloy ◽  
Very High

A Pd-Ni/La(Sr)CrO3-Ce(Sm)O2 composite anode showed good performance for solid oxide fuel cell reactions with dry CH4. Compositions of Pd and Ni in the Pd-Ni/La(Sr)CrO3-Ce(Sm)O2 composite anode affected the electrochemical oxidation catalysis of dry CH4. The Pd and Ni ratios from 50:50 to 75:25 were suitable for the oxidation. The Pd-Ni/La(Sr)CrO3-Ce(Sm)O2 composite anode showed the high tolerance to the carbon deposition under closed and open circuit conditions. A Pd-Ni/Ce(Sm)O2 catalyst showed very low catalytic activity for decomposition of dry CH4. A Pd-Ni/SiO2 catalyst showed very high catalytic activity for the decomposition of dry CH4 and a large amount of deposited carbon formed. The Pd-Ni particles on SiO2 were quite multifaceted from TEM-EDS observation. On the other hand, the Pd-Ni particles on Ce(Sm)O2 support had a spherical shape and doping of Ce and Sm was confirmed. This nature should inhibit the formation of particular plane that is essential for the carbon fiber formation. The detail function of Ce(Sm)O2 and La(Sr)CrO3 supports was discussed.

Rapid and large-scale synthesis of Co3O4 octahedron particles with very high catalytic activity, good supercapacitance and unique magnetic properties

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 104991-105002 ◽  
Author(s):  
Mahabubur Chowdhury ◽  
Oghenochuko Oputu ◽  
Mesfin Kebede ◽  
Franscious Cummings ◽  
Oscar Cespedes ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Catalytic Activity ◽  
Large Scale ◽  
High Catalytic Activity ◽  
Large Scale Synthesis ◽  
Very High

Octahedron Co3O4 particles with very high catalytic activity, good supercapacitance, and unique magnetic properties.

LDH-derived catalysts for complete oxidation of volatile organic compounds

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 67-77 ◽  
Author(s):  
K. Bahranowski ◽  
E. Bielańska ◽  
R. Janik ◽  
T. Machej ◽  
E. M. Serwicka
Keyword(s):  
Catalytic Activity ◽  
Mixed Oxide ◽  
Copper Chromite ◽  
Oxide System ◽  
High Catalytic Activity ◽  
Commercial Catalyst ◽  
Volatile Organic ◽  
Double Hydroxides ◽  
Very High

AbstractThe Cu,Cr-, Zn,Cr- and Cu,Al-layered double hydroxides have been synthesized by the coprecipitation method and characterized by elemental analysis, PXRD, SEM/EDS and BET. The mixed oxide materials obtained upon calcination at 873 K show very high catalytic activity for the combustion of toluene and ethanol. The best sample is derived from the Cu,Cr-LDH precursor with a Cu:Cr ratio of 2, composed of copper oxide and copper chromite. This catalyst gave 50% conversion of toluene and ethanol at temperatures of 45 and 15 K lower, respectively, than the reference commercial catalyst. Catalytic tests with a mechanical mixture of CuO and CuCr2O4 demonstrate that the use of an LDH precursor is essential for optimum results. The importance of the simultaneous presence of both Cu and Cr, the influence of the Cu:Cr ratio on the catalytic activity and the role of the interface boundaries in the CuO-CuCr2O4 mixed oxide system are discussed.

scholarly journals Application of Nanotechnology in Post-treatment of Automobile Tail Gas Nitrogen Oxides

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Xie Yansheng
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Good Prospect ◽  
Exhaust Gas ◽  
Automobile Exhaust ◽  
Existing Problems ◽  
Catalytic Materials ◽  
Nano Catalyst ◽  
And Performance ◽  
Very High

Nano-catalyst has a very high catalytic activity and has a good prospect in automobile exhaust gas purifi cation. Thispaper summarizes the research status of nano-scale automobile exhaust gas purifi cation catalytic materials in recentyears, focusing on the analysis of the structure and performance of several components in the tail gas catalyst afternano-scale, and discusses its existing problems and application trends.

Facet-controlled hollow Rh2S3 hexagonal nanoprisms as highly active and structurally robust catalysts toward hydrogen evolution reaction

2016 ◽  
Vol 9 (3) ◽  
pp. 850-856 ◽  
Author(s):  
Donghwan Yoon ◽  
Bora Seo ◽  
Jaeyoung Lee ◽  
Kyoung Sik Nam ◽  
Byeongyoon Kim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Highly Active ◽  
One Step ◽  
Very High ◽  
Excellent Stability

Hollow Rh2S3 hexagonal nanoprisms, prepared by one-step formation of core–shell nanoprisms followed by the etching of a core, exhibit very high catalytic activity and excellent stability toward hydrogen evolution reaction.

Aqueous CO2 reduction on morphology controlled CuxO nanocatalysts at low overpotential

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44583-44591 ◽  
Author(s):  
Mengyang Fan ◽  
Zhengyu Bai ◽  
Qing Zhang ◽  
Chengyu Ma ◽  
Xiao-Dong Zhou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Co2 Reduction ◽  
High Catalytic Activity ◽  
Special Morphology ◽  
Low Overpotential ◽  
Very High

The CuxO180-2 catalyst obtained with 3D hierarchical nanosphere structures could catalyze CO2 reduction in aqueous solution with very high catalytic activity and superb selectivity of produced formate, significantly outperforming CuxO catalysts without such special morphology.

High catalytic activity for water oxidation based on nanostructured nickel phosphide precursors

2015 ◽  
Vol 51 (58) ◽  
pp. 11626-11629 ◽  
Author(s):  
Ali Han ◽  
Huanlin Chen ◽  
Zijun Sun ◽  
Jun Xu ◽  
Pingwu Du
Keyword(s):  
Catalytic Activity ◽  
Noble Metal ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
High Catalytic Activity ◽  
Nickel Phosphide ◽  
Catalyst Precursor ◽  
Metal Free ◽  
Water Oxidation Catalysis ◽  
First Time

For the first time, noble-metal-free nickel phosphide (Ni2P) was used as an excellent catalyst precursor for water oxidation catalysis.

scholarly journals High Catalytic Activity of Heterometallic (Fe6Na7 and Fe6Na6) Cage Silsesquioxanes in Oxidations with Peroxides

2017 ◽  
Author(s):  
Alexey I. Yalymov ◽  
Alexey N. Bilyachenko ◽  
Mikhail M. Levitsky ◽  
Alexander A. Korlyukov ◽  
Victor N. Khrustalev ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Hydroxyl Radicals ◽  
Acetonitrile Solution ◽  
High Catalytic Activity ◽  
X Ray ◽  
Complex Ii ◽  
Alkyl Hydroperoxides ◽  
Catalytically Active ◽  
Very High

Two types of heterometallic (Fe(III),Na) silsesquioxanes [Ph5Si5O10]2[Ph10Si10O21]Fe6(O2‒)2Na7(H3O+)(MeOH)2(MeCN)4.5.1.25(MeCN), I, and [Ph5Si5O10]2[Ph4Si4O8]2Fe6Na6(O2‒)3(MeCN)8.5(H2O)8.44, II, were obtained and characterized. X-Ray studies established distinctive structures of both products, with pair of Fe(III)-O-based triangles surrounded by siloxanolate ligands, giving fascinating cage architectures. Complex II proved to be catalytically active in the formation of amides from alcohols and amines, thus becoming a rare example of metallasilsesquioxanes performing homogeneous catalysis. Benzene, cyclohexane and other alkanes, as well as alcohols, can be oxidized in acetonitrile solution to phenol, the corresponding alkyl hydroperoxides and ketones, respectively, by hydrogen peroxide in air in the presence of catalytic amounts of complex II and trifluoroacetic acid. Thus, the cyclohexane oxidation at 20 °C gave oxygenates in very high for alkanes yield (48% based on alkane). The kinetic behaviour of the system indicates that the mechanism includes the formation of hydroxyl radicals generated from hydrogen peroxide in its interaction with diiron species. The latter are formed via monomerization of starting hexairon complex with further dimerization of the monomers.

Manganese(ii) complex of an oxygen–nitrogen donor Schiff base ligand showing efficient catechol oxidase activity: synthesis, spectroscopic and kinetic study

2020 ◽  
Vol 44 (9) ◽  
pp. 3748-3754 ◽  
Author(s):  
Piyali Adak ◽  
Antu Mondal ◽  
Shyamal Kumar Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Kinetic Study ◽  
Schiff Base Ligand ◽  
Oxidase Activity ◽  
Catechol Oxidase ◽  
High Catalytic Activity ◽  
Nitrogen Donor ◽  
Aerial Oxidation ◽  
Very High

A Mn(ii) complex containing two tridentate O,N,O-donor semicarbazone ligands shows very high catalytic activity for the aerial oxidation of 3,5DTBCH2 with kcat = 3.10 × 106 h−1, and kcat/KM = 3.25 × 108 h−1 M−1.

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