CO2 methanation on the catalyst of Ni/MCM-41 promoted with CeO2

Xiaoliu Wang; Lingjun Zhu; Yincong Liu; Shurong Wang

doi:10.1016/j.scitotenv.2017.12.308

CO₂ methanation on the catalyst of Ni/MCM-41 promoted with CeO₂

Sci Total Environ. 2018 Jun 1:625:686-695. doi: 10.1016/j.scitotenv.2017.12.308. Epub 2018 Jan 3.

Authors

Xiaoliu Wang¹, Lingjun Zhu¹, Yincong Liu¹, Shurong Wang²

Affiliations

¹ State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
² State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. Electronic address: srwang@zju.edu.cn.

PMID: 29306156
DOI: 10.1016/j.scitotenv.2017.12.308

Abstract

CO₂ as a raw feed combined with renewable hydrogen for the production of useful chemicals and alternative energy products is one of the solutions to environmental and energy problems. In this study, a series of Ni-xCeO₂/MCM-41 catalysts with a nickel content of 20wt% were prepared through deposition precipitation method for CO₂ methanation. Different characterization methods, including BET, XRD, TEM, SEM, H₂-TPR and H₂-TPD were applied to help explore the influence mechanism of CeO₂ on Ni/MCM-41 in CO₂ methanation. It was found that all CeO₂-promoted catalysts exhibited enhanced catalytic activity when compared to Ni/MCM-41. The catalyst modified with 20wt% CeO₂ showed the best catalytic performance, with CO₂ conversion and CH₄ selectivity of 85.6% and 99.8%, respectively, at the temperature of 380°C under atmospheric pressure. The synergetic effects among Ni⁰ active sites, the promoter and the support, including nickel dispersion improvement and increased CO₂ adsorption sites due to the addition of CeO₂, were considered as important factors for high reactivity of the promoted catalysts. The stability test showed that the promoted catalyst maintained its high reactivity after 30h.

Keywords: CO(2); CeO(2); Methanation; Ni/MCM-41; Reactivity.