Enhanced activity and stability of Ni/La₂O₂CO₃ catalyst for CO₂ methanation by metal-carbonate interaction

Yihu Dai^a,*, Min Xu^a, Qiaojun Wang^a, Rui Huang^a, Yunyun Jin^a, Bo Bian^a,Chantsalmaa Tumurbaatar^a, Bolormaa Ishtsog^a, Tungalagtamir Bold^b, Yanhui Yang^a,*

^a Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China

^b School of Applied Sciences, Mongolian University of Science and Technology, Ulaanbaatar, 14191, Mongolia

Abstract:

The interaction between metal and support is critical for CO₂ methanation reaction over supported Ni catalysts. This work provides a modification strategy using surface carbonate species for promoting the catalytic performances of lanthana-supported Ni catalyst. The structure of Ni-La₂O₂CO₃ interfaces is verified to be stable against thermal decomposition and reduction reaction, determining catalytic roles through specific metal-carbonate interaction. The medium-strength surface basicity promotes the capability of CO₂ chemisorption. The carbonate-modified interfaces facilitate the formation of monodentate and bidentate formates as the reaction intermediates. These species are highly reactive for further transformation into CH₄ even in the presence of CO poison.

Appl. Catal. B-Environ., 2020, 277, 119271.（影响因子：14.229）

论文链接： https://doi.org/10.1016/j.apcatb.2020.119271