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.