State Key Laboratory for Liquefaction, Gasification and Efficient Low Carbon Utilization of Coal, Shanghai Yankuang Energy Technology R&D Co., Ltd., Shanghai 201203, China
Different Mn doped CoCuMnx/Al2O3 catalysts are prepared via an equal volume impregnation method,and the influences of Mn additive on the structure and catalytic performance of the catalysts are studied.The prepared catalysts are characterized by means of XRD,XPS,SEM,BET,H2-TPR and CO2-TPD.Results show that Mn acts as a structural aid to disperse other active metal components in the catalyst,and there exist electron transfer and interaction between Co and Mn atoms on the surface of the catalyst.Mn additive helps to disperse metal active phases,increase intermediate and strong acidic sites,increase CO2 non dissociative adsorption sites,and effectively improve catalytic activity.Under reaction conditions such as 300℃,3 MPa and 4 800 h-1,CoCuMn1/Al2O3 catalyst with a Mn molar ratio of 1 helps to achieve a CO2 conversion rate of 46.9%,a CO selectivity of 2.2%,and a CH4 selectivity of 95.2%.Therefore,the structure of the catalysts can be effectively regulated through precisely controlling the dosage of Mn additive,thereby achieving excellent catalytic activity for CO2 hydrogenation methanation.
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