scholarly journals Cu supported on mesoporous ceria: water gas shift activity at low Cu loadings through metal–support interactions

2017 ◽  
Vol 19 (27) ◽  
pp. 17708-17717 ◽  
Author(s):  
Dimitriy Vovchok ◽  
Curtis J. Guild ◽  
Jordi Llorca ◽  
Wenqian Xu ◽  
Tahereh Jafari ◽  
...  
Keyword(s):  
Water Gas Shift ◽  
Wgs Reaction ◽  
Metal Support ◽  
Metal Support Interactions ◽  
Water Gas

We synthesized, characterized and tested Cu supported mesoporous CeO2 catalyst for the water-gas shift (WGS) reaction.

Highly active and stable copper catalysts derived from copper silicate double-shell nanofibers with strong metal–support interactions for the RWGS reaction

2019 ◽  
Vol 55 (29) ◽  
pp. 4178-4181 ◽  
Author(s):  
Yang Yu ◽  
Renxi Jin ◽  
Justin Easa ◽  
Wei Lu ◽  
Man Yang ◽  
...  
Keyword(s):  
Copper Catalysts ◽  
Water Gas Shift ◽  
Highly Active ◽  
Reverse Water Gas Shift ◽  
Metal Support ◽  
Rwgs Reaction ◽  
Metal Support Interactions ◽  
Shift Reaction ◽  
Water Gas ◽  
Supported Copper Catalysts

Double-shell hollow nanofiber supported copper catalysts with strong metal–support interactions were prepared and applied in the reverse water–gas shift reaction.

Molecular-level understanding of reaction path optimization as a function of shape concerning the metal–support interaction effect of Co/CeO2 on water-gas shift catalysis

2019 ◽  
Vol 9 (18) ◽  
pp. 4928-4937 ◽  
Author(s):  
Yingying Zhan ◽  
Yi Liu ◽  
Xuanbei Peng ◽  
Weitao Zhao ◽  
Yongfan Zhang ◽  
...  
Keyword(s):  
Active Sites ◽  
Molecular Level ◽  
Reaction Path ◽  
Hydrogen Reduction ◽  
Water Gas Shift ◽  
Wgs Reaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Water Gas

In this work, the active sites generated in hydrogen reduction and the reaction pathways for the water gas shift (WGS) reaction over Co/CeO2 catalysts were studied by in situ XAS and XPS coupled with DFT+U calculations.

scholarly journals Dynamic structure of active sites in ceria-supported Pt catalysts for the water gas shift reaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuanyuan Li ◽  
Matthew Kottwitz ◽  
Joshua L. Vincent ◽  
Michael J. Enright ◽  
Zongyuan Liu ◽  
...  
Keyword(s):  
Active Sites ◽  
Synergistic Effects ◽  
Dynamic Structure ◽  
Water Gas Shift ◽  
Considerable Uncertainty ◽  
Active Structure ◽  
Noble Metal Catalysts ◽  
Wgs Reaction ◽  
Metal Support ◽  
Water Gas

AbstractOxide-supported noble metal catalysts have been extensively studied for decades for the water gas shift (WGS) reaction, a catalytic transformation central to a host of large volume processes that variously utilize or produce hydrogen. There remains considerable uncertainty as to how the specific features of the active metal-support interfacial bonding—perhaps most importantly the temporal dynamic changes occurring therein—serve to enable high activity and selectivity. Here we report the dynamic characteristics of a Pt/CeO2 system at the atomic level for the WGS reaction and specifically reveal the synergistic effects of metal-support bonding at the perimeter region. We find that the perimeter Pt0 − O vacancy−Ce3+ sites are formed in the active structure, transformed at working temperatures and their appearance regulates the adsorbate behaviors. We find that the dynamic nature of this site is a key mechanistic step for the WGS reaction.

scholarly journals Heterolytic Hydrogen Activation: Understanding Support Effects in Water-Gas Shift, Hydrodeoxygenation, and CO Oxidation Catalysis

2019 ◽  
Author(s):  
Nicholas Nelson ◽  
János Szanyi
Keyword(s):  
Equilibrium Constant ◽  
Oxidation Catalysis ◽  
Water Gas Shift ◽  
Oxide Supports ◽  
Late Transition Metals ◽  
Oxide Support ◽  
Wgs Reaction ◽  
Metal Support ◽  
Water Gas ◽  
Hydroxyl Formation

Identifying the role of oxide supports in transition metal catalysis is critical toward our understanding of heterogeneous catalysis. The water-gas shift (WGS) reaction is a prototypical example where oxide support dictates catalytic activity, yet the cause for this remains uncertain. Herein, we show that a single descriptor—the equilibrium constant for hydroxyl formation—relates the WGS turnover frequency across disparate oxide supports. The dissimilar equilibrium constant, or oxophilicity, between early and late transition metals exemplify the utility of metal-support interfacial sites to circumvent adsorption-energy scaling restrictions, thereby providing bifunctional gains for the WGS reaction class. In relation, the equilibrium constant for hydroxyl formation is equivalent to the equilibrium constant for the formal heterolytic dissociation of hydrogen, and therefore, reflects the ability of the metal-support interface to participate in hydrogen heterolysis. The ubiquitous coexistence, yet divergent chemical behavior of homo- and heterolytically activated hydrogen renders oxide support identity central toward our understanding of hydrogenation catalysis.

scholarly journals Heterolytic Hydrogen Activation: Understanding Support Effects in Water-Gas Shift, Hydrodeoxygenation, and CO Oxidation Catalysis

2019 ◽  
Author(s):  
Nicholas Nelson ◽  
János Szanyi
Keyword(s):  
Equilibrium Constant ◽  
Oxidation Catalysis ◽  
Water Gas Shift ◽  
Oxide Supports ◽  
Late Transition Metals ◽  
Oxide Support ◽  
Wgs Reaction ◽  
Metal Support ◽  
Water Gas ◽  
Hydroxyl Formation

Identifying the role of oxide supports in transition metal catalysis is critical toward our understanding of heterogeneous catalysis. The water-gas shift (WGS) reaction is a prototypical example where oxide support dictates catalytic activity, yet the cause for this remains uncertain. Herein, we show that a single descriptor—the equilibrium constant for hydroxyl formation—relates the WGS turnover frequency across disparate oxide supports. The dissimilar equilibrium constant, or oxophilicity, between early and late transition metals exemplify the utility of metal-support interfacial sites to circumvent adsorption-energy scaling restrictions, thereby providing bifunctional gains for the WGS reaction class. In relation, the equilibrium constant for hydroxyl formation is equivalent to the equilibrium constant for the formal heterolytic dissociation of hydrogen, and therefore, reflects the ability of the metal-support interface to participate in hydrogen heterolysis. The ubiquitous coexistence, yet divergent chemical behavior of homo- and heterolytically activated hydrogen renders oxide support identity central toward our understanding of hydrogenation catalysis.

Facet-dependent activity of shape-controlled TiO2 supported Au nanoparticles for water-gas shift reaction†

2022 ◽  
Author(s):  
Yuanting Tang ◽  
Yongjie Chen ◽  
Xiao Liu ◽  
Chengxiong Wang ◽  
Yunkun Zhao ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Oxide Interface ◽  
Wgs Reaction ◽  
Dependent Activity ◽  
Shape Controlled ◽  
Shift Reaction ◽  
Water Gas

The bifunctional role of noble metal/oxide interface in the activation of reactants is of vital importance in heterogeneous catalysis of water-gas shift (WGS) reaction. Herein, three types of shape-controlled TiO2...

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