Ni/Al2O3 catalysts for CO methanation: Effect of Al2O3 supports calcined at different temperatures

Gao, Jiajian; Jia, Chunmiao; Li, Jing; Zhang, Meiju; Gu, Fangna; Xu, Guangwen; Zhong, Ziyi; Su, Fabing

doi:10.1016/s2095-4956(14)60273-4

Cited by 116 publications

(76 citation statements)

References 54 publications

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“…Similar behavior was previously reported for Ni/SiO 2 [32], Ni/CeO 2 [33], Ni/Al 2 O 3 [34] and Ni/ZrO 2 [35] catalysts, in good agreement with the data presented in this paper. Contrary to its Ni analogue, Cu monometallic sample was completely inactive in the methanation reaction.…”

Section: A N U S C R I P Tsupporting

confidence: 93%

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: A N U S C R I P Tsupporting

confidence: 93%

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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“…Supported Ni catalysts are the most widely investigated materials for CO 2 methanation due to their high efficiency in CH 4 production and low cost [75][76][77][78][79][80][81][82][83][84][85][86][87][88][89]. A lot of supports have been investigated for Ni catalysts since, as is well known, the catalytic performance strongly depends upon the nature and properties of the support.…”

Section: Nickel-based Catalystsmentioning

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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“…The proposed explanations for the loss of Ni surface area at these conditions are usually sintering of the Ni particles and pore collapse, the latter leading to the encapsulation of Ni particles [4,8,15,16]. Another possible explanation is the oxidation of Ni nanoparticles.…”

Section: Thermal Sinteringmentioning

confidence: 99%

“…Yet, high temperature treatments lead to catalysts with low metallic surface area and so, low activity. This problem is presented, for instance, in the work of Gao et al [16] in which they studied the effect of the alumina calcination temperature prior to its impregnation with the Ni precursor. In their work, they showed that low calcination temperatures lead to high surface area carriers and, consequently, to catalysts with higher nickel dispersion, as expected.…”

Section: Introductionmentioning

confidence: 99%

Deactivation of Ni/γ-Al2O3 Catalysts in CO Methanation: Effect of Zr, Mg, Ba and Ca Oxide Promoters

et al. 2017

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reserves [1,2]. The SNG production process involves two steps: gasification of the carbon-containing feedstock and subsequent catalytic methanation of the resulting synthesis gas. Methanation of synthesis gas involves the two following reactions [3][4][5]:These reactions are thermodynamically favored at low temperature and high pressure [6]. It is therefore that the methanation process is designed to effectively remove the heat of reaction and thus maximize the methane yield [1,7]. There are currently two main methanation concepts: single fluidized bed reactors and series of adiabatic fixed bed reactors with intercooling [1]. The latter, also known as high temperature methanation, has already found commercial application [8,9].Alumina-supported nickel catalysts are usually employed in this application due to their high activity, selectivity to methane and relatively low price [7]. However, their stability is threatened by the severe conditions of the high temperature methanation process [10,11]. In this process, the catalyst at the inlet of the reactor is exposed to low temperatures and high CO partial pressures, fact that favors the formation of polymeric carbon and sintering via nickel carbonyl formation [4,[12][13][14]. The exothermic reactions cause a significant temperature rise. As a result, the major part of the catalyst in these reactors is exposed to high temperatures and high steam partial pressures fact that promotes sintering of the nickel nanoparticles and the support [11,15]. In order to limit the temperature rise and thus, catalyst deactivation, a high gas recycle is used in these reactors. Catalysts with improved stability at low andAbstract Catalyst deactivation is one of the major concerns in the production of substitute natural gas (SNG) via CO methanation. Catalysts in this application need to be active at low temperatures, resistant to polymeric carbon formation and stable at high temperatures and steam partial pressures. In the present work, a series of aluminasupported nickel catalysts promoted with Zr, Mg, Ba or Ca oxides were investigated. The catalysts were tested under low temperature CO methanation conditions in order to evaluate their resistance to carbon formation. The catalysts were also exposed to accelerated ageing conditions at high temperatures in order to study their thermal stability. The aged catalysts lost most of their activity mainly due to sintering of the support and the nickel crystallites. Apparently, none of these promoters had a satisfactory effect on the thermal resistance of the catalyst. Nevertheless, it was found that the presence of Zr can reduce the rate of polymeric carbon formation.

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Ni/Al2O3 catalysts for CO methanation: Effect of Al2O3 supports calcined at different temperatures

Cited by 116 publications

References 54 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

Supported Catalysts for CO2 Methanation: A Review

Deactivation of Ni/γ-Al2O3 Catalysts in CO Methanation: Effect of Zr, Mg, Ba and Ca Oxide Promoters

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