Enhancing the low-temperature CO2 methanation over Ni/La-CeO2 catalyst: the effects of surface oxygen vacancy and basic site on the catalytic performance

Tengfei Zhang, Weiwei Wang, Fangna Gu*, Wenqing Xu*, Jianling Zhang, Zhenxing Li*, Tingyu Zhu, Guangwen Xu, Ziyi Zhong, Fabing Su*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This work reports a strategy to promote the low-temperature CO2 methanation on the Ni-based catalyst by tuning the surface oxygen vacancy and medium-strength basic sites of the CeO2 support and thus changing the reaction pathway. La species was introduced into CeO2 support and calcined at 600 °C (CeO2-La-600) to form a La-Ce-O solid solution with a thin La2O2CO3 layer on the surface, generating more basic sites and oxygen vacancies. This unique structure facilitated the adsorption and direct dissociation of CO2. Over Ni/CeO2-La-600, the reaction follows the HCOO* and *CO pathways, while over Ni/CeO2-600, the reaction occurs via the HCOO* pathway only. The decomposition of CO2* to *CO is energetically more favorable than hydrogenation to HCOO* on Ni/CeO2-La-600, resulting in its higher catalytic performance at low temperatures. This work unravels the complex interplay among oxygen vacancy, basic site, and reaction pathway in CO2 methanation over the Ni-based catalysts.
Original languageEnglish
JournalApplied Catalysis B: Environmental
DOIs
StateE-pub ahead of print - 8 Apr 2022

Keywords

  • CO2 methanation
  • Ni catalyst
  • La-Ce-O solid solution
  • Performance
  • Mechanism

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