基于碱改性Ni/Al2O3催化剂的生物质气化模拟气甲烷化性能研究OA

In this paper,the Ni/Al2O3 monolithic catalyst with 15％Ni content was prepared using cordierite as a matrix,and the catalyst was modified with 10％NaOH to study the methanation performance of biomass gasification simulated gas based on alkali-modified Ni/Al2O3 monolithic catalyst.BET,TEM,H2-TPR,XRD,CO2-TPD and TG were used to characterize the physicochemical properties of the catalyst before and after modification.The results indicated that the CO conversion rate trends of unmodified and modified Ni/Al2O3 monolithic catalysts over 2 h were fundamentally consistent.However,the Ni/Al2O3 catalysts modified for 2 h demonstrated significantly enhanced performance compared to those modified for 1 h.Regarding CH4 selectivity,the modified Ni/Al2O3 catalyst exhibited markedly better performance than the unmodified Ni/Al2O3 catalyst,confirming the enhanced methane performance of the alkali-modified Ni/Al2O3 monolithic catalyst.Under optimized conditions(H2/CO volume ratio of 3∶1,space velocity of 10000 mL/(g·h),and temperature of 400℃),the methanation performance of the Ni/Al2O3 monolithic catalyst modified for 2 h reached its peak,achieving a CO conversion rate of 97％with 100％CH4 selectivity.