Phys Chem Chem Phys. 2021 Mar 11;23(9):5551-5558. doi: 10.1039/d0cp06257j.

CO.

Physical chemistry chemical physics : PCCP

Masitah Hasan, Toshiki Asakoshi, Hiroki Muroyama, Toshiaki Matsui, Koichi Eguchi

PMID: 33651045 DOI: 10.1039/d0cp06257j

Abstract

Supported Ni catalysts are active in CO2 methanation. It is important to understand the reaction mechanism for the development of highly-active catalysts. In this study, we investigated the reaction pathways of CO2 methanation over Ni/Y2O3 and Ni/Al2O3 based on the adsorbates observed by diffuse reflectance infrared Fourier transform spectroscopy. For Ni/Al2O3, linear and bridged CO adsorbates were converted to nickel carbonyl hydride and/or formyl species, which would be further hydrogenated to methane. In contrast, the formation of formate adsorbates was specifically confirmed over Ni/Y2O3 under the CO2 methanation condition. The hydrogen molecule was activated by dissociatively-adsorbing on Ni particles. Then, the hydrogenation of formate adsorbates by the activated hydrogen species proceeded sequentially to form methane. The observed bridged CO species would not be a major intermediate for Ni/Y2O3.

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• Journal Article