Preparation and Catalytic Properties of H_5PMo_(10)V_2O_(40)/SBA-15 Catalyst

Based on Keggin heteropolyacid(H5PMo10V2O40) as host and the mesoporous molecular sieve(SBA-15) as a carrier,a catalyst(H5PMo10V2O40/SBA-15) with the different amount of H5PMo10V2O40 was prepared using sol-gel process.The structure and properties of the catalyst were characterized by XRD,FTIR,TEM,H2-TPR and N2 adsorption-desorption.The H5PMo10V2O40 /SBA-15 can be applied for the oxidation reaction of benzene.The catalytic reaction was investigated under different conditions,such as temperature,reaction time,amount of catalyst,etc.As results of experiment,H5PMo10V2O40 was highly dispersed on the SBA-15 of which the structure was not changed,in addition,huge amounts of desolventing was limited during the reaction.Compared with H5PMo10V2O40,the H5PMo10V2O40/SBA-15 showed much higher selectivity and conversion from benzene to phenol.When the amount of catalyst was 0.25 g and its loading was 60%,the selectivity was up to 82.53% at 70 ℃ for 2 h.