scholarly journals Novel Catalytic Systems for Hydrogen Production via the Water-Gas Shift Reaction

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Klito C. Petallidou ◽  
Kyriaki Polychronopoulou ◽  
Angelos M. Efstathiou
Keyword(s):  
Surface Acidity ◽  
Acid Sites ◽  
Water Gas Shift ◽  
Lower Amount ◽  
Mixed Metal Oxide ◽  
Oxide Supports ◽  
Mixed Metal ◽  
Wgs Reaction ◽  
Production Of Hydrogen ◽  
Water Gas

The present work reports on the development of new catalysts for the production of hydrogen via the water-gas shift (WGS) reaction. In particular, the effect of Ce/La atom ratio on the catalytic performance of 0.5 wt% Pt supported on Ce1−xLaxO2−δ (x=0.0,0.2,0.5,0.8,1.0) mixed metal oxides for the WGS reaction was investigated. It was found that the addition of 20 at.% La3+ in CeO2 lattice increased significantly the catalytic activity and stability of 0.5 wt% Pt/Ce0.8La0.2O2−δ solid. More precisely, a lower amount of “carbon” was accumulated on the catalyst surface, whereas surface acidity and basicity studies showed that Ce0.8La0.2O2−δ had the highest concentration of labile oxygen and acid sites, and the lowest concentration of basic sites compared to the other Ce1−xLaxO2−δ mixed metal oxide supports (x=0.2,0.5,0.8).

Magnesium-aluminum mixed metal oxide supported copper nanoparticles as catalysts for water-gas shift reaction

Fuel ◽  
2016 ◽  
Vol 184 ◽  
pp. 382-389 ◽  
Author(s):  
Dalin Li ◽  
Yunbing Cai ◽  
Chongqi Chen ◽  
Xingyi Lin ◽  
Lilong Jiang
Keyword(s):  
Metal Oxide ◽  
Copper Nanoparticles ◽  
Water Gas Shift ◽  
Mixed Metal Oxide ◽  
Water Gas Shift Reaction ◽  
Mixed Metal ◽  
Shift Reaction ◽  
Water Gas

Cu-Based mixed metal oxides for an efficient photothermal catalysis of the water-gas shift reaction

2019 ◽  
Vol 9 (9) ◽  
pp. 2125-2131 ◽  
Author(s):  
Fuli Liu ◽  
Lizhu Song ◽  
Shuxin Ouyang ◽  
Hua Xu
Keyword(s):  
Metal Oxides ◽  
Water Gas Shift ◽  
Mixed Metal Oxides ◽  
Water Gas Shift Reaction ◽  
Mixed Metal ◽  
Wgs Reaction ◽  
Shift Reaction ◽  
Water Gas

Cu–ZnO catalyst with a well-designed nanojunction structure was fabricated for the photothermal catalysis of the water-gas shift (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.

In situ/operando studies for the production of hydrogen through the water-gas shift on metal oxide catalysts

2013 ◽  
Vol 15 (29) ◽  
pp. 12004 ◽  
Author(s):  
José A. Rodriguez ◽  
Jonathan C. Hanson ◽  
Dario Stacchiola ◽  
Sanjaya D. Senanayake
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Water Gas Shift ◽  
Metal Oxide Catalysts ◽  
Production Of Hydrogen ◽  
Water Gas ◽  
Operando Studies

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...

Outdoor sunlight-driven scalable water-gas shift reaction through novel photothermal device-supported CuOx/ZnO/Al2O3 nanosheets with a hydrogen generation rate of 192 mmol g−1 h−1

2020 ◽  
Vol 8 (37) ◽  
pp. 19467-19472
Author(s):  
Chengcheng Shi ◽  
Dachao Yuan ◽  
Luping Ma ◽  
Yaguang Li ◽  
Yangfan Lu ◽  
...  
Keyword(s):  
Production Rate ◽  
Light Absorption ◽  
Hydrogen Generation ◽  
Water Gas Shift ◽  
Generation Rate ◽  
Water Gas Shift Reaction ◽  
Wgs Reaction ◽  
Shift Reaction ◽  
Water Gas

A new photothermal device is constructed by the Cr based selective light absorption film which can heat the 2D CuZnAl to 297 °C under 1 standard sun irradiation, leading to a 192 mmol g−1 h−1 of H2 production rate from 1 sun irradiated WGS reaction.

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