CO methanation over ZrO2/Al2O3 supported Ni catalysts: A comprehensive study

Guo, Chengchao; Wu, Yuanyuan; Qin, Hongyun; Zhang, Jinli

doi:10.1016/j.fuproc.2014.02.017

Cited by 85 publications

(38 citation statements)

References 35 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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“…Nevertheless, it cannot be discarded that the addition of Ca enhances the formation of carbon. Finally, it can be concluded that promotion with ZrO 2 can diminish the carbon formation rate, as suggested in previous studies [19][20][21][22]. The results encourage the performance of long tests in order to confirm that Zr inhibits carbon formation and reduces the catalyst deactivation rate.…”

Section: Carbon Formationsupporting

confidence: 83%

“…Moreover, none of these promoters led to a decent improvement of the catalyst thermal resistance. The results may be surprising since previous studies [19,21,22] claimed that Zr, for instance, and atoms of C β formed per Ni active site (right). The latter was calculated using the metallic dispersion obtained from H 2 -static chemisorption enhanced the catalyst thermal stability.…”

Section: Thermal Sinteringmentioning

confidence: 81%

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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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“…For instance, Guo et al [40] reported that the addition of ZrO 2 to Ni/Al 2 O 3 catalysts enhances the resistance against carbon formation and sintering. Moreover, Zhang et al [13,41] have recently compared Ni/SiC with Ni/Al 2 O 3 and have found higher stability on Ni/SiC.…”

Section: Introductionmentioning

confidence: 99%