Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (1): 193-199.DOI: 10.1016/S1872-2067(11)60459-2

• Research papers • Previous Articles     Next Articles

Catalytic epoxidation of cyclohexene over mesoporous-silica immobilized Keggin-type tungstophosphoric acid

CAI Wenjia, ZHOU Yan, BAO Renlie, YUE Bina, HE Heyongb   

  1. Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
  • Received:2012-08-31 Revised:2012-09-18 Online:2013-01-23 Published:2013-01-23

Abstract: A series of aminosilylated mesoporous silica (SBA-15) samples with different contents of (3-aminopropyl)triethoxysilane (APTES), synthesized using a simple one-pot method, were used as hosts for immobilization of Keggin-type 12-phosphotungstic acid (H3PW12O40). The loading of H3PW12O40 increased with increasing content of grafted APTES. The obtained materials were calcined at different temperatures, and the tungsten species were highly dispersed inside the SBA-15 channels. The catalytic activities of these samples were tested in heterogeneous oxidation of cyclohexene using H2O2 as the oxidant. The effects of different loadings and treatment temperatures on the activities of the catalysts were also investigated. The catalysts calcined at 400 °C showed high catalytic activities and reusabilities.

Key words: 12-phosphotungstic acid, aminosilylation, SBA-15, epoxidation, cyclohexene