【摘 要】
：
The propylene epoxidation over TS-1/SiO2 catalyst hydrothermally treated was investigated. It was found by EPR characterization that two types of Ti (Ⅳ)-supero
【机 构】
：
Department of Catalysis Chemistry and Engineering and State Key Lab. of Fine Chem.
【基金项目】
：
国家重点基础研究发展计划(973计划);Doctorate Foundation of Liaoning Province
论文部分内容阅读
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 (gz=2.0271; gy=2.0074; gx=2.0010) and B (gz=2.0247; gy= 2.0074; gx= 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 H2O2 with above 94% PO selectivity is obtained during continuous running for 300 h under the conditions of reaction temperature 45℃, 0.5 h-1WHSV of propylene.
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