2022, Volume 14, Issue 7
Engineering >> 2022, Volume 14, Issue 7 doi: 10.1016/j.eng.2021.08.023
Controlling the Reconstruction of Ni/CeO2 Catalyst during Reduction for Enhanced CO Methanation
a State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
b Operando Molecular Spectroscopy and Catalysis Research Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA
c Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
d Dalian Research Institute of Petroleum and Petrochemicals, SINOPEC, Dalian 116045, China
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Abstract
Reductive pretreatment is an important step for activating supported metal catalysts but has received little attention. In this study, reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment conditions. In contrast to the traditional activation procedure in hydrogen, activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain boundaries. The unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation rate. The current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.
Keywords
Nickel–ceria catalyst ; Catalyst activation ; Crystallinity ; Methanation ; In situ spectroscopy
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