Dataset Information

Ni nanocatalysts supported on mesoporous Al₂O₃-CeO₂ for CO₂ methanation at low temperature.

ABSTRACT: The selectivity and activity of a nickel catalyst for the hydrogenation of carbon dioxide to form methane at low temperatures could be enhanced by mesoporous Al₂O₃-CeO₂ synthesized through a one-pot sol-gel method. The performances of the as-prepared Ni/Al₂O₃-CeO₂ catalysts exceeded those of their single Al₂O₃ counterpart giving a conversion of 78% carbon dioxide with 100% selectivity for methane during 100 h testing, without any deactivation, at the low temperature of 320 °C. The influence of CeO₂ doping on the structure of the catalysts, the interactions between the mesoporous support and nickel species, and the reduction behaviors of Ni²⁺ ions were investigated in detail. In this work, the addition of CeO₂ to the composites increased the oxygen vacancies and active metallic nickel sites, and also decreased the size of the nickel particles, thus improving the low temperature catalytic activity and selectivity significantly.

SUBMITTER: Wu Y

PROVIDER: S-EPMC9048714 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Publications

Ni nanocatalysts supported on mesoporous Al2O3-CeO2 for CO2 methanation at low temperature.

Wu Yushan Y Lin Jianghui J Ma Guangyuan G Xu Yanfei Y Zhang Jianli J Samart Chanatip C Ding Mingyue M

RSC advances 20200110 4

The selectivity and activity of a nickel catalyst for the hydrogenation of carbon dioxide to form methane at low temperatures could be enhanced by mesoporous Al2O3-CeO2 synthesized through a one-pot sol-gel method. The performances of the as-prepared Ni/Al2O3-CeO2 catalysts exceeded those of their single Al2O3 counterpart giving a conversion of 78% carbon dioxide with 100% selectivity for methane during 100 h ...[more]

PMID: 35494600

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Project description:In this work, various amounts of Ce were added to TiO2 to form a mixed oxide support; Ce x Ti1-x O2 (x = 0, 0.003, 0.05, 0.10 and 0.15) and then those synthesized supports were impregnated by 10 wt% Ni to produce a catalysts. The 10 wt% Ni-Ce x Ti1-x O2 (x = 0, 0.003, 0.05, 0.10 and 0.15) catalysts were tested for CO2 methanation reaction by using a fixed-bed reactor in the temperature range of 100-500 °C. The sample was pretreated at 450 °C under H2 and then a mixed feed gas of CO2 and H2 was switched into the reactor to start the reaction. The results showed that 10 wt% Ni-Ce0.003Ti0.997O2 catalyst (the lowest Ce content) exhibited the highest CO2 conversion and CH4 yield. Moreover, 10 wt% Ni-Ce0.003Ti0.997O2 showed highly stable during the stability test (50 h.). The results indicated that upon addition of small amount of Ce into TiO2-supported Ni, the surface, structural, electrical and redox properties of the catalyst were improved to the extent that these properties can promote the catalytic activities for CO2 methanation. The Ce addition can improve the CO2 methanation catalytic activity by several ways. First, higher dispersion of Ni on catalysts surface upon addition of Ce was observed which resulted in higher adsorption rate of H2 on this metal active site. Second, formation of a larger amounts of oxygen vacancies as well as basicity improvement upon addition of Ce were occurred which can increase the CO2 adsorption on catalyst surface. Third, incorporation of Ce resulted in improving of a starting reduction temperature of Ni2+ to Ni0 for TiO2-supported Ni catalyst which can indicate that the reducibility of Ce-doped TiO2-supported Ni catalyst was enhanced and then alter its catalytic activity. However, increasing of Ce content led to lowering of CO2 methanation activities which resulted from increasing of basicity by Ce addition. The excess amounts of adsorbed CO2 would lead to competitive adsorption to H2 and then lead to a decrease of catalytic activity. Therefore, an appropriate amount of H2 and CO2 adsorption ability on catalyst surface was a prominent factor to dominate the catalytic activity.

Dataset Information

Ni nanocatalysts supported on mesoporous Al₂O₃-CeO₂ for CO₂ methanation at low temperature.

Publications

Ni nanocatalysts supported on mesoporous Al<sub>2</sub>O<sub>3</sub>-CeO<sub>2</sub> for CO<sub>2</sub> methanation at low temperature.

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