scholarly journals Structural Evolution of Ga–Cu Model Catalysts for CO2 Hydrogenation Reactions

2021 ◽  
Author(s):  
Jian-Qiang Zhong ◽  
Shamil Shaikhutdinov ◽  
Beatriz Roldan Cuenya
Keyword(s):  
Structural Evolution ◽  
Co2 Hydrogenation ◽  
Model Catalysts ◽  
Hydrogenation Reactions

scholarly journals Hydrogenation of CO2 Promoted by Silicon-Activated H2S: Origin and Implications

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 50
Author(s):  
Xing Liu
Keyword(s):  
Low Temperatures ◽  
Underlying Mechanism ◽  
Reactive Species ◽  
Co2 Hydrogenation ◽  
Usual Method ◽  
Title Reaction ◽  
Hydrogenation Of Co2 ◽  
Hydrogenation Reactions

Unlike the usual method of COx (x = 1, 2) hydrogenation using H2 directly, H2S and HSiSH (silicon-activated H2S) were selected as alternative hydrogen sources in this study for the COx hydrogenation reactions. Our results suggest that it is kinetically infeasible for hydrogen in the form of H2S to transfer to COx at low temperatures. However, when HSiSH is employed instead, the title reaction can be achieved. For this approach, the activation of CO2 is initiated by its interaction with the HSiSH molecule, a reactive species with both a hydridic Hδ− and protonic Hδ+. These active hydrogens are responsible for the successive C-end and O-end activations of CO2 and hence the final product (HCOOH). This finding represents a good example of an indirect hydrogen source used in CO2 hydrogenation through reactivity tuned by silicon incorporation, and thus the underlying mechanism will be valuable for the design of similar reactions.

Structural Evolution and Dynamics of an In2O3 Catalyst for CO2 Hydrogenation to Methanol: An Operando XAS-XRD and In Situ TEM Study

2019 ◽  
Vol 141 (34) ◽  
pp. 13497-13505 ◽  
Author(s):  
Athanasia Tsoukalou ◽  
Paula M. Abdala ◽  
Dragos Stoian ◽  
Xing Huang ◽  
Marc-Georg Willinger ◽  
...  
Keyword(s):  
Structural Evolution ◽  
Co2 Hydrogenation ◽  
In Situ Tem ◽  
Operando Xas

scholarly journals Electrocatalytic CO2 hydrogenation to C2 based products through C–C coupling over Cu(100) nanocube

2021 ◽  
Author(s):  
Shyama Charan Mandal ◽  
Biswarup Pathak
Keyword(s):  
Density Functional ◽  
Theoretical Calculations ◽  
Co2 Hydrogenation ◽  
Periodic Surfaces ◽  
Mechanistic Investigation ◽  
Hydrogenation Reactions

In this study, we have considered a Cu nanocube (Cu-NC) based catalyst exposed with (100) facets for CO2 hydrogenation reactions. All the feasible mechanistic pathways for the formations of C1 (HCOOH, CH3OH and CH4) and C2 (C2H4 and C2H5OH) based products have been explored using the density functional theoretical calculations and the most plausible pathways have been identified. The calculated results are compared with the previous reports on the periodic Cu(100) and Cu(111) surfaces, and also on the surface of Cu85 nanocluster and Cu(111) monolayer. The in-depth mechanistic investigation shows that Cu-NC can be very selective towards the C2 based products with a lower limiting potential (calculated) compared to the periodic surfaces. The underlying reasons for such findings have been explained and compared that with the periodic surfaces. We therefore, propose that the Cu-NC based catalysts can be more promising for C2 based products.

In situ structural evolution of single particle model catalysts under ambient pressure reaction conditions

Nanoscale ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 331-338 ◽  
Author(s):  
Sara Fernández ◽  
Lu Gao ◽  
Jan Philipp Hofmann ◽  
Jérôme Carnis ◽  
Stéphane Labat ◽  
...  
Keyword(s):  
Single Particle ◽  
Ambient Pressure ◽  
Structural Evolution ◽  
Model Catalysts ◽  
Particle Model ◽  
Lattice Orientation ◽  
Reaction Conditions ◽  
Single Particle Model

In situ evolution of the strain and lattice orientation of single particle model catalysts.

scholarly journals Ceria-based model catalysts: fundamental studies on the importance of the metal–ceria interface in CO oxidation, the water–gas shift, CO2 hydrogenation, and methane and alcohol reforming

2017 ◽  
Vol 46 (7) ◽  
pp. 1824-1841 ◽  
Author(s):  
José A. Rodriguez ◽  
David C. Grinter ◽  
Zongyuan Liu ◽  
Robert M. Palomino ◽  
Sanjaya D. Senanayake
Keyword(s):  
Co Oxidation ◽  
Metal Catalysts ◽  
Co2 Hydrogenation ◽  
Model Catalysts ◽  
Water Gas Shift ◽  
Water Gas

Model metal/ceria and ceria/metal catalysts have shown to be excellent systems for studying fundamental phenomena linked to the operation of technical catalysts.

scholarly journals Effect of Cu and Cs in the β-Mo2C System for CO2 Hydrogenation to Methanol

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1213 ◽  
Author(s):  
Ana Belén Dongil ◽  
Qi Zhang ◽  
Laura Pastor-Pérez ◽  
Tomás Ramírez-Reina ◽  
Antonio Guerrero-Ruiz ◽  
...  
Keyword(s):  
Molybdenum Carbide ◽  
Catalytic Performance ◽  
Co2 Hydrogenation ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Present Communication ◽  
Fresh Catalyst ◽  
Global Challenge ◽  
Hydrogenation Reactions ◽  
Supported Molybdenum Carbide

Mitigation of anthropogenic CO2 emissions possess a major global challenge for modern societies. Herein, catalytic solutions are meant to play a key role. Among the different catalysts for CO2 conversion, Cu supported molybdenum carbide is receiving increasing attention. Hence, in the present communication, we show the activity, selectivity and stability of fresh-prepared β-Mo2C catalysts and compare the results with those of Cu/Mo2C, Cs/Mo2C and Cu/Cs/Mo2C in CO2 hydrogenation reactions. The results show that all the catalysts were active, and the main reaction product was methanol. Copper, cesium and molybdenum interaction is observed, and cesium promoted the formation of metallic Mo on the fresh catalyst. The incorporation of copper is positive and improves the activity and selectivity to methanol. Additionally, the addition of cesium favored the formation of Mo0 phase, which for the catalysts Cs/Mo2C seemed to be detrimental for the conversion and selectivity. Moreover, the catalysts promoted by copper and/or cesium underwent redox surface transformations during the reaction, these were more obvious for cesium doped catalysts, which diminished their catalytic performance.

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