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

Zhang, Tengfei ¹Wang, Weiwei ²Gu, Fangna ²Xu, Wenqing ²Zhang, Jianling ²Li, Zhenxing ²Zhu, Tingyu ²Xu, Guangwen ³Zhong, Ziyi ⁴Su, Fabing²

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作者信息

1. Chinese Acad Sci
2. China Univ Petr
3. Shenyang Univ Chem Technol
4. Guangdong Technion Israel Inst Technol GTIIT
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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 degrees 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.

Key words

CO2 methanation/Ni catalyst/La-Ce-O solid solution/Performance/Mechanism/CARBON-DIOXIDE METHANATION/NI CATALYSTS/NI/CEO2 CATALYST/NI/ZRO2 CATALYST/CERIA/NANOPARTICLES/SELECTIVITY/CEO2/ORGANIZATION/FRAMEWORK

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量50

参考文献量86

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