Bimetallic Ni–Cu catalyst supported on CeO2 for high-temperature water–gas shift reaction: Methane suppression via enhanced CO adsorption

Saw, Eng Toon; Oemar, Usman; Tan, Xiuli; Du, Yonghua; Borgna, Armando; Hidajat, K.; Kawi, Sibudjing

doi:10.1016/j.jcat.2014.03.015

Cited by 282 publications

(203 citation statements)

References 112 publications

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“…The XRD patterns of the mono and bimetallic reduced copper-nickel catalysts are shown in gasification activity of the bimetallic samples during the reaction, as reported elsewhere [24]. In addition, Cu and Ni as well as both alloys particle sizes were estimated using Scherrer equation (Table 3).…”

Section: Xrd Diffraction Resultsmentioning

confidence: 90%

“…Analogously to the gasification reaction, the presence of Cu attenuates Ni methanation activity. Very recently, Saw et al [24] observed a similar behavior over Cu-Ni/CeO 2 catalysts and attributed the suppression of the methanation activity to the Cu-Ni alloy formation and its influence on the CO adsorption behavior and dissociation ability. Not only the alloying could suppress the Ni methanation activity, for example, a decrease by Na addition of the low coordinated Ni atoms, responsible for the CO breaking and subsequent hydrogenation reaction could also account for this [36].…”

Section: A N U S C R I P Tmentioning

confidence: 76%

“…Therefore, one of the challenges of catalyst's design is the substitution of noble metals [20] with more common and less expensive alternatives while maintaining high catalytic efficiency. Cu, Ni and Cu-Ni supported on activated carbon has been used in methanol [21], dimethyl carbonate [22], and diethyl carbonate synthesis [23] and in principle are also suitable for the WGS reaction [24]. Nowadays, Cu and Ni metals supported on SiO 2 [25], Al 2 O 3 [26], CeO 2 [27] and ZrO 2 [28], have been widely employed as heterogeneous catalysts for the water gas shift reaction.…”

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confidence: 99%

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Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

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Highlights-Efficient Cu-Ni catalysts supported on activated carbon for the water gas shift reaction.-Supressed methanation activity due to the presence of Cu.-Cu-Ni alloy as a key factor of the catalytic design.-Good stability and tolerance towards start/stop situations. AbstractThe water-gas shift (WGS) reaction over structured Cu, Ni, and bimetallic Cu-Ni supported on active carbon (AC) catalysts was investigated. The structured catalysts were prepared in pellets form and applied in the medium range WGS reaction. A good activity in the 180-350 °C temperature range was registered being the bimetallic Cu-Ni:2-1/AC catalyst the best catalyst. Page 2 of 38A c c e p t e d M a n u s c r i p tThe presence of Cu mitigates the methanation activity of Ni favoring the shift process. In addition the active carbon gasification reaction was not observed for the Cu-containing catalyst converting the active carbon in a very convenient support for the WGS reaction. The stability of the bimetallic Cu-Ni:2-1/AC catalyst under continuous operation conditions, as well as its tolerance towards start/stop cycles was also evaluated.

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Section: Xrd Diffraction Resultsmentioning

confidence: 90%

Section: A N U S C R I P Tmentioning

confidence: 76%

mentioning

confidence: 99%

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Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Arbeláez

Reina

Ivanova

et al. 2015

Applied Catalysis A: General

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“…The associative mechanism proposes that water is dissociated to hydroxyls on the oxygen vacancies on the ceria surface, and the formed hydroxyls react with CO adsorbed on the metal particles to yield formates, which decompose to CO 2 and hydrogen [46]. Furthermore, it has been also proposed, although mainly for Cu-based catalysts and higher reaction temperatures, that the reaction intermediate is a carboxyl which would further decompose into CO 2 and H 2 [47].…”

Section: Reactionmentioning

confidence: 99%

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

Dongil

Pastor‐Pérez

Sepúlveda-Escribano

et al. 2015

Applied Catalysis A: General

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Graphical abstract Highlights-Graphene-supported Ni and Ni-CeO 2 catalysts have been studied.-Metal dispersion depends on the presence of ceria and on the precipitating agent, NaOH or urea.-The graphene support strongly interacts with the ceria promoter.-The presence of sodium increases the catalytic activity, mainly in the presence of ceria. AbstractThe low temperature water-gas shift (WGS) reaction has been studied over NiCeO 2 /Graphene and Ni/Graphene. The catalysts were prepared with 5 wt% Ni and 20 wt% CeO 2 loadings, by deposition-precipitation employing sodium hydroxide and urea as precipitating agents. The materials were characterized by TEM, powder X-ray diffraction, Raman spectroscopy, H 2 -temperature-programmed reduction and X-ray photoelectron spectroscopy (XPS). The characterization and the reaction results indicated that the interaction between the active species and the support is higher than with activated carbon, and this hinders the reducibility of ceria and thus the catalytic performance. On the other hand, the presence of residual sodium in samples prepared by precipitation with NaOH facilitated the reduction of ceria. The catalytic activity was highly improved in the presence of sodium, what can be explained on the basis of an associative reaction mechanism which is favored over Ni-O-Na entities.

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“…Even several units for every process may be included depending on the design of the fuel processor, in order to maximize the production and the energetic efficiency [2][3][4][5][6][7]. Herein, CuO-CeO2 systems have demonstrated outstanding activity for the mentioned reactions and therefore they are intimately linked to the development of the last generation of hydrogen alimented fuel cells [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

WGS and CO-PrOx reactions using gold promoted copper-ceria catalysts: “Bulk CuO CeO2 vs. CuO CeO2/Al2O3 with low mixed oxide content”

Reina

Ivanova

Laguna

et al. 2016

Applied Catalysis B: Environmental

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A copper-ceria bulk catalyst has been compared to a series of catalysts designed according to the as called "supported approach", corresponding to the dispersion of low content mixed copper-ceria oxide on alumina matrix. The principal characteristics of both types of catalysts are contemplated and the differences in their electronic and redox properties discussed in details. As a plus, the gold metal promotion of the catalysts is also envisaged. The advantages of the systems in the CO clean up reactions, WGS and CO-PrOx are commented. While the WGS activity appears to be ruled especially by the Cu/Ce surface to volume ratio, the CO-PrOx reaction is governed by the CuO loading. Gold addition provides benefits only at the low temperature WGS regime. Very importantly, the supported systems are always superior to the bulk configuration in terms of specific activity, a key factor from the catalyst's design perspective.

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Bimetallic Ni–Cu catalyst supported on CeO2 for high-temperature water–gas shift reaction: Methane suppression via enhanced CO adsorption

Cited by 282 publications

References 112 publications

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Mono and bimetallic Cu-Ni structured catalysts for the water gas shift reaction

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

WGS and CO-PrOx reactions using gold promoted copper-ceria catalysts: “Bulk CuO CeO2 vs. CuO CeO2/Al2O3 with low mixed oxide content”

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