Preparation of VPO Catalysts and their Physical Properties

Zeng Ling
(Department of Biochemical and Chemical Engineering, Zhejiang University
of Science and Technolohy, Hangzhou, 310012 China)

Abstract VPO catalysts were prepared by different methods. The effects these preparation methods on the phase composition and specific surface area of VPO catalysts were indicated by BET, XRD techniques. The results indieate that for water medium the VPO catalysts have lower specific surface area and complex crystal phase. The higher the temperature of calcination, the lower the surface area of catalysts with increasing crystallinity. While from organic medium and ball mill method, The VPO catalysts have lager specific surface area and an active phase (VO)₂P₂O₇. Through the supercritical fluid drying (SCFD) process the specific surface area of catalyst were increased notably and the crystal phase became more perfect.
Key words VPO catalyst, Preparation methods, Specific surface area, Crystal phase