Preparation,Characterization and Catalytic Properties of Sn-Containing MCM-41

The molecular sieve catalysis material of Si-MCM-41,Sn-MCM-41 were preparaed under the condition of low template concentration in weak base and the samples were characterized by XRD,N2 adsorption-desorption,FT-IR,ICP-AES and TEM techniques.Effect of the synthesis methods on the Sn-containing MCM-41 were studied.The results showed that Sn species were mainly incorporated into the framework of MCM-41 molecular sieves prepared by direct hydrothermal synthesis method(DHT),while Sn species were mainly existed on the wall surface of Sn-MCM-41 molecular sieves prepared by template-ion exchange method(TIE).The catalytic properties of Sn containing MCM-41 molecular sieves in Baeyer-Villiger oxidation of cyclohexanone were investigated.Catalytic activity results show that under the reaction condition of n(H2O2):n(Cyclohexanone)=3:1,30 g dioxane,at 70℃ for 6 h,the conversion of cyclohexanone and the selectivity of e-caprolactone reach 40.02% and 45.69%,respectively.