Micropore modification of zeolites with transition-metal oxides

The micropores of USY and ZSM-5 zeolites were modified with the transition-metal oxides, such as Fe2O3, MoO3 and V2O5. The structures of the modified samples were characterized by XRD and the physical features were determined by N2 adsorption method. The results show that the transition-metal oxides can diffuse well into the micropores of zeolites. The surface area, micropore area, pore volume and typical pore diameter of the modified samples change respectively, and the change might result in a novel process for the design of the shape-selective catalysts and special adsorbents.