Hydrogen production by water–gas shift reaction over bimetallic Cu–Ni catalysts supported on La-doped mesoporous ceria

Lin, Jiann-Horng; Biswas, Prakash; Guliants, Vadim V.; Misture, Scott T.

doi:10.1016/j.apcata.2010.08.003

Cited by 126 publications

(129 citation statements)

References 35 publications

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“…This catalyst quadruplicates the activity of the Ni/CeO2 solid at 240 °C, and reaches equilibrium conversion at 260 °C. Compared to others Ni-ceria catalysts previously reported, our carbon-supported sample performs better even under harder WGS conditions [17,18]. This is a very promising result since this material seems to be as efficient as some well-known noble metal based catalysts for this reaction [19].…”

Section: Wgs Behaviorsupporting

confidence: 54%

Ni-CeO2/C Catalysts with Enhanced OSC for the WGS Reaction

et al. 2015

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Abstract:In this work, the WGS performance of a conventional Ni/CeO2 bulk catalyst is compared to that of a carbon-supported Ni-CeO2 catalyst. The carbon-supported sample resulted to be much more active than the bulk one. The higher activity of the Ni-CeO2/C catalyst is associated to its oxygen storage capacity, a parameter that strongly influences the WGS behavior. The stability of the carbon-supported catalyst under realistic operation conditions is also a subject of this paper. In summary, our study represents an approach towards a new generation of Ni-ceria based catalyst for the pure hydrogen production via WGS. The dispersion of ceria nanoparticles on an activated carbon support drives to improved catalytic skills with a considerable reduction of the amount of ceria in the catalyst formulation.

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Section: Wgs Behaviorsupporting

confidence: 54%

Ni-CeO2/C Catalysts with Enhanced OSC for the WGS Reaction

et al. 2015

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“…Previous work dealing with TPR studies on the reduction of Ni-Cu/y-Al 2 O 3 catalysts suggested that the addition of Cu to Ni precursors can dramatically decrease the reducing temperature of Ni oxides, and might markedly enhance the reducibility of the mixed oxide catalysts [23,38,39]. The promotion effect was stronger as the amount of Cu introduced increased [40][41][42].…”

Section: Tprmentioning

confidence: 74%

Influence of copper on nickel-based catalysts in the conversion of glycerol

Miranda

Chimentão

Szanyi

et al. 2015

Applied Catalysis B: Environmental

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The catalytic transformation of glycerol to value-added compounds was investigated over bimetallic Ni-Cu/y-Al2 O3 catalysts with Ni/Cu atomic ratios of 8/1, 4/1, 2/1, 1/1, 1/2, 1/4, and 1/8. XPS analysis revealed that the surface composition of the catalyst exhibited progressive enrichment of Cu as its content in the catalyst increased. H2 -chemisorption indicated that the total number of exposed Ni atoms decreased as the Cu content increased. As a result, deep hydrogenolysis to produce CH4 was inhibited by the addition of Cu to the Ni catalyst, yielding higher selectivity toward the dehydration products of glycerol such as hydroxyacetone.FTIR spectra of adsorbed CO reveal that Cu asserts both geometric and electronic effects on the adsorption properties of Ni. The geometrical effect is visualized by the progressive disappearance of the bridge-bound adsorbed CO on metallic Ni by the incorporation of Cu. This suggests that the deep hydrogenolysis of glycerol to CH4 formation requires an ensemble of adjacent active Ni atoms. The electronic effect of Cu on Ni is indicated by the red shift of the IR peak of adsorbed CO as the Cu content increases. The electronic interaction between Cu and Ni species was also substantiated by XANES results. HTREM revealed metal particles very well distributed on the support with particle size of 1.5 to 5 nm. The Ni-Cu samples were not a total intermetallic alloys..

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“…Unfortunately, compared with Cu, the presence of Ni also promotes CO adsorption, [9] carbon deposition, [10] and an undesirable side reaction (methanation). [11] In the case of lowtemperature fuel cells, a strong CO-electrode interaction is detrimental, because the CO level must be reduced for cell tolerance. [12] Additionally, carbon deposition ultimately results in catalyst deactivation [13] and methanation consumes H 2 ; the higher the CH 4 yield, the lower the H 2 yield in the WGS reaction.…”

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confidence: 99%

Do Ni/Cu and Cu/Ni Alloys have Different Catalytic Performances towards Water‐Gas Shift? A Density Functional Theory Investigation

et al. 2014

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Density functional calculations were preformed to investigate whether adding Ni into a Cu surface (denoted as Cu/Ni) or adding Cu into a Ni surface (Ni/Cu) is more efficient for catalyzing the water-gas shift (WGS)? The reactions of water dissociation and monoxide dissociation were selected to assess the activity and selectivity towards WGS, respectively. Our results show that Ni-atom modification of surfaces is thermodynamically favorable for both reactions. Kinetically, compared with pure Cu, water dissociation is greatly facilitated on Ni-modified surfaces, and the activity is insensitive to the Ni concentration; however, monoxide dissociation is not well-promoted on one Ni-atom-modified surfaces, but two Ni-atom modification can notably decrease the dissociation barriers. Overall, on the basis of these results, we conclude that 1) the catalytic performance of bimetallic metals is superior to monometallic ones; 2) at the same Ni concentration on the surface, Cu/Ni and Ni/Cu alloys have almost the same performance towards WGS; and 3) to acquire high WGS performance, the surface Ni atoms should either be low in concentration or highly dispersed.

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Hydrogen production by water–gas shift reaction over bimetallic Cu–Ni catalysts supported on La-doped mesoporous ceria

Cited by 126 publications

References 35 publications

Ni-CeO2/C Catalysts with Enhanced OSC for the WGS Reaction

Ni-CeO2/C Catalysts with Enhanced OSC for the WGS Reaction

Influence of copper on nickel-based catalysts in the conversion of glycerol

Do Ni/Cu and Cu/Ni Alloys have Different Catalytic Performances towards Water‐Gas Shift? A Density Functional Theory Investigation

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