不同前驱体对Rh@ZSM-5催化甲烷部分氧化反应性能的影响OA

Methane(CH4)is a"double-edged sword"energy source with high calorific value and strong greenhouse effect,so the development of catalytic conversion technology for CH4 is crucial for energy utilization and environmental protection.Although noble metal catalysts show high CH4 conversion rates and product selectivities in partial oxidation of methane(POM)reaction,they face the problem of high cost.It is a feasible cost reduction method to improve the utilization rate of noble metals by increasing the dispersion of active metals through the domain-limiting effect of molecular sieves.In order to further improve the catalytic performances of catalysts for POM reaction,a hydrothermal synthesis method was used to prepare Rh@ZSM-5(Cl)and Rh@ZSM-5 catalysts with rhodium chloride and rhodium nitrate as precursors,respectively.The catalysts and ZSM-5 support were characterized by XRD,TEM,N2 adsorption/desorption and so on.The regulatory effect of precursor introduction on the catalytic performances of catalysts were explored,and the differences of catalytic performances were tested.The results show that rhodium chloride precursor induces the generation of O—Rh—Cl active species,significantly enhancing the interaction between active metals and the carriers.Rh@ZSM-5(Cl)exhibits excellent catalytic performance for POM reaction,with CH4 conversion rate of 90.7%and H2 selectivity of 94.5%at 900℃,attributed to the dynamic coupling of water-gas shift reaction(WGSR)and POM reaction promoted by O—Rh—Cl active species.