Citation: Wei Guo CHENG, Xiang Sheng WANG, Gang LI, Xin Wen GUO, Qing Song LIN. Highly Effective Propylene Epoxidation over TS-1/SiO₂ Hydrothermally Treated[J]. Chinese Chemical Letters, ;2005, 16(1): 103-106. shu

Highly Effective Propylene Epoxidation over TS-1/SiO₂ Hydrothermally Treated

Department of Catalysis Chemistry and Engineering and State Key Lab. of Fine Chem., Dalian Univ. of Technol., Dalian 116012

Received Date: 3 December 2003

Fund Project: Supported by the National Key Basic Research Project of China (G2000048009) and the Doctorate Foundation of Liaoning Province(2001102085)

The propylene epoxidation over TS-1/SiO₂ catalyst hydrothermally treated was investigated. It was found by EPR characterization that two types of Ti (Ⅳ)-superoxide radicals,A (g_z=2.0271; g_y=2.0074; g_x=2.0010) and B (g_z=2.0247; g_y=2.0074; g_x=2.0010), were observed for TS-1/SiO₂. The superoxo species A converted to B after TS-1/SiO₂ catalyst was hydrothermally treated. The results show that over TS-1/SiO₂ catalyst hydrothermally treated at 170℃, about 95% conversion of H₂O₂with above 94% PO selectivity is obtained during continuous running for 300 h under the conditions of reaction temperature 45℃, 0.5 h^-1 WHSV of propylene.
- Hydrothermal,
- TS-1/SiO₂,
- propylene epoxidation,
- EPR,
- radical.
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