scholarly journals Carbon-Supported KCoMoS2 for Alcohol Synthesis from Synthesis Gas

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1321
Author(s):  
Mohamed E. Osman ◽  
Vladimir V. Maximov ◽  
Viktor S. Dorokhov ◽  
Viktor M. Mukhin ◽  
Tatiana F. Sheshko ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Activated Carbons ◽  
Supported Catalysts ◽  
Carbon Support ◽  
Micropore Volume ◽  
Higher Alcohol ◽  
Support Materials ◽  
Alcohol Synthesis ◽  
Al2o3 Support ◽  
Carbon Coated

KCoMoS2 was supported on various carbon support materials to study the support effect on synthesis gas conversion. Next to two activated carbons with high micropore volume, a traditional alumina (γ-Al2O3) support and its carbon coated form (CCA) were studied for comparison. Coating alumina with carbon increases the selectivity to alcohols, but the AC-supported catalysts show even higher alcohol selectivities and yields, especially at higher temperatures where the conversions over the AC-supported catalysts increase more than those over the γ-Al2O3-based catalysts. Increasing acidity leads to decreased CO conversion yield of alcohols. The two activated-carbon-supported catalysts give the highest yield of ethanol at the highest conversion studied, which seems to be due to increased KCoMoS2 stacking and possibly to the presence of micropores and low amount of mesopores.

Insight into reaction pathways in CO hydrogenation reactions over K/MoS2 supported catalysts via alcohol/olefin co-feed experiments

2016 ◽  
Vol 6 (6) ◽  
pp. 1957-1966 ◽  
Author(s):  
Micaela Taborga Claure ◽  
Michael R. Morrill ◽  
Jin Wai Goh ◽  
Song-Hai Chai ◽  
Sheng Dai ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Co Hydrogenation ◽  
Supported Catalysts ◽  
Reaction Pathways ◽  
Higher Alcohol Synthesis ◽  
Higher Alcohol ◽  
Alcohol Synthesis ◽  
Hydrogenation Reactions ◽  
Insight Into

Reaction pathways for higher alcohol synthesis from syngas are studied over K/MoS2 domains supported on mesoporous carbon (C) and mixed MgAl oxide (MMO) via addition of methanol, ethanol, and ethylene co-feeds.

Studies of surface and structural heterogeneity of carbon supports and carbon-supported catalysts

1995 ◽  
Vol 53 ◽  
pp. 418-419
Author(s):  
J. Liu ◽  
S. M. Colburn ◽  
R. L. Ornberg ◽  
J. R. Ebner
Keyword(s):  
Low Voltage ◽  
Activated Carbons ◽  
Structural Information ◽  
Supported Catalysts ◽  
Structural Heterogeneity ◽  
Dark Field ◽  
Metal Particles ◽  
Carbon Supports ◽  
Support Materials ◽  
Microscopy Techniques

Activated carbons are generally used as support materials for precious metal catalysts. Properties of carbon that are important to catalyst preparation and application include composition, surface area, microstructure and pore shape and size distribution. Macropores (> 50 nm), mesopores (2-50 nm) and micropores (<2 nm) generally coexist in activated carbons. The accessibility of metal particles dispersed in microporous systems is of predominant importance, especially for large molecules that exhibit slow diffusion transport in narrow pores. It is desirable to have metal particles highly dispersed in readily accessible locations. As part of an on-going program of the characterization of carbonsupported catalysts we report some preliminary observations of the microstructure of carbon supports by a variety of electron microscopy techniquesCommercial carbon supports and carbon-supported Pt catalysts were used in this study. High resolution secondary electron (SE) microscopy, low voltage backscattered electron (LVBE) microscopy and high-angle annular dark-field (HAADF) microscopy techniques were employed to extract surface and structural information.

scholarly journals Towards High Efficacy of Pd-Au/C Catalyst for Tetrachloromethane Hydrodechlorination

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 338-359
Author(s):  
Magdalena Bonarowska ◽  
Zbigniew Kaszkur ◽  
Krzysztof Matus ◽  
Alicja Drelinkiewicz ◽  
Tomasz Szumełda ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Gas Phase ◽  
Thermal Activation ◽  
Supported Catalysts ◽  
Carbon Support ◽  
Thermal Reduction ◽  
Microwave Oven ◽  
Optimal Conditions ◽  
Catalyst Activation ◽  
Critical Part

We present an efficient strategy for synthesising the PdAu catalysts with a homogeneous PdAu alloy phase for environmentally important hydrodechlorination of tetrachloromethane in the gas phase. The synthesis of carbon-supported catalysts involved two major steps: (i) incorporation of palladium and gold nanoparticles into carbon support and (ii) activation of the catalysts. The critical part of this work was to find the optimal conditions for both steps. Thus, the incorporation of the nanoparticles was carried out in two ways, by impregnation and direct redox reaction method using acetone solutions of metal precursor salts. The activation was performed either by a conventional thermal reduction in hydrogen or flash irradiation in a microwave oven. The homogeneity and structure of the PdAu alloy were found to depend on the catalyst activation method critically. In all cases, we observed better homogeneity for catalysts that were subject to microwave irradiation. Moreover, the flash microwave irradiation of prepared catalysts provided catalysts of better stability and selectivity towards the desired products (hydrocarbons) in the hydrodechlorination of tetrachloromethane as compared to the catalyst obtained by conventional thermal activation in hydrogen.

Novel Carbon Structure as Highly Stable Support for Electro-catalyst in Acid Media: Regulating Oxygen Functionalization Behavior of Carbon

2021 ◽  
Author(s):  
Guokang Han ◽  
Yongrong Sun ◽  
Yuxin Liu ◽  
Lingfeng Li ◽  
Xudong Li ◽  
...  
Keyword(s):  
Precious Metal ◽  
Catalytic Properties ◽  
Supported Catalysts ◽  
Carbon Support ◽  
Carbon Structure ◽  
Acid Media

The nature of carbon support has huge effects on the catalytic properties of supported catalysts. When utilized for electrochemical purposes as support for precious metal in acid media, the oxygen...

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