scholarly journals Catalyst Particle Density Controls Hydrocarbon Product Selectivity in CO2 Electroreduction on CuO x

ChemSusChem ◽  
2017 ◽  
Vol 10 (22) ◽  
pp. 4642-4649 ◽  
Author(s):  
Xingli Wang ◽  
Ana Sofia Varela ◽  
Arno Bergmann ◽  
Stefanie Kühl ◽  
Peter Strasser
Keyword(s):  
Particle Density ◽  
Catalyst Particle ◽  
Product Selectivity ◽  
Co2 Electroreduction ◽  
Hydrocarbon Product

Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Shahram Sharifnia ◽  
A. Khodadadi ◽  
Y. Mortazavi
Keyword(s):  
Strong Dependence ◽  
Operating Pressure ◽  
Product Selectivity ◽  
Hydrogen Distribution ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Ft Synthesis ◽  
Co Conversion ◽  
Methane Selectivity ◽  
Hydrocarbon Product

The present study examines the effect of hydrogen distribution (HD) along a Co/SiO2 catalyst bed on Fischer-Tropsch (FT) synthesis. The synthesis is performed under two pressures of 1.0 and 9.0 atm and different H2/CO ratios. The results are compared to those of the usual co-feed, in which both CO and H2 are introduced to the bed inlet. By HD strategy, the methane selectivity is suppressed by as much as 25% and the C11+ selectivity is enhanced up to 26%. CO conversion and product selectivity exhibited a strong dependence on the operating pressure and H2/CO ratio, when hydrogen is distributed.

scholarly journals CO2 Electroreduction: Morphological and Compositional Design of Pd-Cu Bimetallic Nanocatalysts with Controllable Product Selectivity toward CO2 Electroreduction (Small 7/2018)

Small ◽  
2018 ◽  
Vol 14 (7) ◽  
pp. 1870031
Author(s):  
Wenjin Zhu ◽  
Lei Zhang ◽  
Piaoping Yang ◽  
Xiaoxia Chang ◽  
Hao Dong ◽  
...  
Keyword(s):  
Product Selectivity ◽  
Co2 Electroreduction ◽  
Compositional Design ◽  
Bimetallic Nanocatalysts

Activation Energies for Chain Growth Propagation and Termination in Fischer–Tropsch Synthesis on Iron Catalyst as a Function of Catalyst Particle Size

2016 ◽  
Vol 41 (4) ◽  
pp. 371-384 ◽  
Author(s):  
Ali Nakhaei Pour ◽  
Fatemeh Dolati
Keyword(s):  
Particle Size ◽  
Iron Catalyst ◽  
Catalyst Particle ◽  
Tropsch Synthesis ◽  
Chain Growth ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Catalyst Particle Size ◽  
Partial Pressures ◽  
Hydrocarbon Product

The influence of the catalyst particle size in determining Fischer–Tropsch synthesis (FTS) performance for nano-structured iron catalysts was investigated. The catalysts were prepared by a microemulsion method and to achieve a series of catalysts with different iron particle size, the water-to-surfactant molar ratio (W/S) in the microemulsion system varied from 4 to 12. The results demonstrate that by decreasing the levels of active phase of the iron catalyst, the termination rates for chain growth are increased compared to the propagation rates. In addition, the activation energy for chain propagation is lower than for chain termination, and this difference (Et – Ep) for the hydrocarbon product distributions which is characterised by α1, is lower than the hydrocarbon product distribution which is characterised by α2 The results indicate the H2 concentration on the catalyst surface is decreased by increasing the catalyst particle size. Thus, the dependence of α (α1, and/or α2) on H2 partial pressures is increased by decreasing of catalyst particle size and the dependence of α2 on H2 partial pressures is weaker than for α1.

On the mechanism of high product selectivity for HCOOH using Pb in CO2 electroreduction

2016 ◽  
Vol 18 (14) ◽  
pp. 9652-9657 ◽  
Author(s):  
Seoin Back ◽  
Jun-Hyuk Kim ◽  
Yong-Tae Kim ◽  
Yousung Jung
Keyword(s):  
Electron Transfer ◽  
High Selectivity ◽  
Reduction Reaction ◽  
Transfer Mechanism ◽  
Product Selectivity ◽  
Electron Transfer Mechanism ◽  
Co2 Electroreduction

To understand a high selectivity for HCOOH on the Pb electrode during the CO2 reduction reaction, we suggest a proton-assisted-electron-transfer mechanism, and validate the new mechanism by experimentally measuring onset potentials for CO2 reduction vs. H2 production. We find that the origin of this high selectivity lies in the strong O-affinitive and weak C-, H-affinitive characteristics of Pb.

Directing the selectivity of CO2 electroreduction to target C2 products via non-metal doping on Cu surfaces

2021 ◽  
Author(s):  
Xing Zhi ◽  
Yan Jiao ◽  
Yao Zheng ◽  
Kenneth Davey ◽  
Shi-Zhang Qiao
Keyword(s):  
Oxygen Affinity ◽  
Product Selectivity ◽  
Metal Doping ◽  
Co2 Electroreduction ◽  
Metal Doped ◽  
Late Stages

Understanding the late stages of C2 pathways provides great opportunities for fully achieving a selective CO2 electroreduction. The C2 product selectivity can be directed by the active site's oxygen affinity on a range of non-metal doped Cu surfaces.

Growth direction and exposed facets of Cu/Cu2O nanostructures affect product selectivity in CO2 electroreduction

2021 ◽  
pp. 125650
Author(s):  
Carmen Castro-Castillo ◽  
Kamala Kanta Nanda ◽  
Elías Mardones-Herrera ◽  
Valeria Gazzano ◽  
Domingo Ruiz-León ◽  
...  
Keyword(s):  
Growth Direction ◽  
Product Selectivity ◽  
Co2 Electroreduction ◽  
Exposed Facets
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