On the Mechanism of CO and CO2 Methanation Over Ni/CeO2 Catalysts

Konishcheva, M.V.; Потемкин, Д.И.; Бадмаев, С. Д.; Snytnikov, P.V.; Paukshtis, E. A.; Sobyanin, V. A.; Parmon, Valentin N.

doi:10.1007/s11244-016-0650-7

Cited by 64 publications

(44 citation statements)

References 21 publications

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“…The mechanism proposed by Westermann et al [50] is indeed in accordance with some suggested pathways also found in the literature, [55,56] where both formates and CO could act as intermediate species for CO 2 methanation reaction, and contrary to those which considered that only CO (mainly over monometallic catalysts) [42,[57][58][59][60][61][62][63] or formate species (mainly over bimetallic catalysts) [64][65][66][67][68][69][70][71] could be the true intermediates in this reaction. Additionally, Westermann et al [54] also proposed that by adding Ce to Ni/zeolites (Ce/Ni/USY) the bifunctional mechanism suggested in the literature without CO as intermediate species [64][65][66][67][68][69][70][71] is favoured. Actually, in this mechanism proposal, and also according to the main findings observed for other multifunctional catalysts, [64][65][66][67][68][69][70][71] H 2 molecules are activated and dissociated into H on Ni 0 sites, while CO 2 is mainly adsorbed on the promoted support forming monodentate carbonates.…”

Section: Mechanism Proposalssupporting

confidence: 84%

“…The mechanism proposed by Westermann et al . is indeed in accordance with some suggested pathways also found in the literature,, where both formates and CO could act as intermediate species for CO 2 methanation reaction, and contrary to those which considered that only CO (mainly over monometallic catalysts), or formate species (mainly over bimetallic catalysts) could be the true intermediates in this reaction. Additionally, Westermann et al .…”

Section: Co2 Methanation Over Zeolite‐based Catalysts Under Thermal Cmentioning

confidence: 92%

“…Additionally, Westermann et al [54] also proposed that by adding Ce to Ni/zeolites (Ce/Ni/USY) the bifunctional mechanism suggested in the literature without CO as intermediate species [64][65][66][67][68][69][70][71] is favoured. Actually, in this mechanism proposal, and also according to the main findings observed for other multifunctional catalysts, [64][65][66][67][68][69][70][71] H 2 molecules are activated and dissociated into H on Ni 0 sites, while CO 2 is mainly adsorbed on the promoted support forming monodentate carbonates. These monodentate carbonates are then sequentially hydrogenated producing hydrogen-carbonates, formates, formaldehydes, methoxy species and, finally, methane.…”

Section: Mechanism Proposalsmentioning

confidence: 99%

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Tuning Zeolite Properties towards CO₂ Methanation: An Overview

et al. 2019

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This work provides a short review of the literature concerning the utilization of zeolites as supports for CO2 methanation catalysts. Indeed, the application of these materials in carbon dioxide hydrogenation into methane has led to considerably relevant performances according to the literature, being zeolite‐based catalysts more active and selective than commercial materials reported. Considering the well‐known zeolite features and the possibility to finely modulate its properties, inducing relevant changes on the adsorbed metal species and in the CO2 activation ability of the catalyst, potentially interesting catalytic properties can be generated also towards this transformation. Possible correlations between the characteristics of these materials, found as relevant for CO2 methanation, and the catalytic properties will be then presented and discussed.

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Section: Mechanism Proposalssupporting

confidence: 84%

Section: Co2 Methanation Over Zeolite‐based Catalysts Under Thermal Cmentioning

confidence: 92%

Section: Mechanism Proposalsmentioning

confidence: 99%

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Tuning Zeolite Properties towards CO₂ Methanation: An Overview

et al. 2019

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“…Ceria was also studied as a single support for efficient Ni catalysts in CO 2 methanation [81,[151][152][153][154], although its synergic effect with zirconia seems to increase the nickel performance.…”

Section: Silica-supported Nickelmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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“…Therefore, the design of high‐performance CO‐SMET catalysts remains a challenging problem today. Recently, the chlorine‐doped nickel–ceria system has been suggested for preferential CO methanation . The positive effect of chlorine additives on the catalyst selectivity was also demonstrated in Ref.…”

Section: Figurementioning

confidence: 99%

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

et al. 2017

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Halogen‐doped Ni(F)/CeO2, Ni(Cl)/CeO2, and Ni(Br)/CeO2 catalysts were prepared by treating halogen‐free Ni/CeO2 with aqueous solutions of NH4F, NH4Cl, and NH4Br, respectively. It was demonstrated that the halogen dopants had distinct effects on the catalyst properties for the CO preferential methanation using realistic reformate gas: fluorine did not change catalytic activity, chlorine inhibited CO2 methanation activity and provided high selectivity towards CO methanation, and bromine completely inhibited both the CO and CO2 methanation activity.

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On the Mechanism of CO and CO2 Methanation Over Ni/CeO2 Catalysts

Cited by 64 publications

References 21 publications

Tuning Zeolite Properties towards CO₂ Methanation: An Overview

Tuning Zeolite Properties towards CO₂ Methanation: An Overview

Supported Catalysts for CO2 Methanation: A Review

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

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On the Mechanism of CO and CO2 Methanation Over Ni/CeO2 Catalysts

Cited by 64 publications

References 21 publications

Tuning Zeolite Properties towards CO2 Methanation: An Overview

Tuning Zeolite Properties towards CO2 Methanation: An Overview

Supported Catalysts for CO2 Methanation: A Review

Preferential Methanation of CO using Halogen‐Doped (F, Cl, Br) Ceria‐Supported Nickel Catalysts

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Product

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Tuning Zeolite Properties towards CO₂ Methanation: An Overview

Tuning Zeolite Properties towards CO₂ Methanation: An Overview