Influence of Ni,Fe,and Cu loaded on γ-Al2O3 in CO2/CH4 conversion via dielectric barrier discharge plasma
Carbon dioxide and methane are the main greenhouse gases,and their conversion and utilization could contribute to the realization of"dual carbon"target.CH4/CO2 conversion via plasma method gets both gas and liquid products,giving the target product low selectivity.Plasma combined with catalysts can effectively improve the selectivity of target product.In this work,active metals of Ni,Fe,and Cu are loaded on γ-Al2O3 by micro-combustion method,and their reaction performance for CH4/CO2 conversion is significantly improved in combination with plasma.Metal loading changes the oxygen vacancy ratio of the catalyst and strengths the intensity of basic sites,which boosts CO2 conversion.The weak acid of the metal catalyst enhances the liquid product selectivity,such as Lewis acid benefits the conversion to alcohol products,while Brønsted acid promotes the generation of acetic acid.Metal catalysts enhance the dielectric barrier discharge power,transfer more charge and increase the reaction energy efficiency.This study reveals the influence of catalyst structure on product selectivity and is conducive to the rational design of catalysts for plasma catalysis.
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