HTS分子筛催化丙烯环氧化反应的研究

研究了晶粒具有空心结构的钛硅分子筛（HTS）催化丙烯环氧化反应的催化性能。分别考察了成型粘结剂、反应温度对HTS催化丙烯环氧化反应的影响。结果表明，硅溶胶作粘合剂挤条成型催化剂对环氧丙烷的选择性显著优于铝溶胶，环氧丙烷选择性和H2O2有效利用率均随反应温度的升高而降低。在固定床反应装置上，采用正交试验法优化的反应条件为：丙烯与H2O2的摩尔比3∶1，甲醇与H2O2的摩尔比为40∶1，质量空速为7.5 h-1。

Study on propylene epoxidation catalyzed by hollow titanium silicalite

The catalytic activity of propylene epoxidation over titanium silicalite with hollow crystal structure (HTS) was studied. The effects of various binders and reaction temperature on the propylene epoxidation catalyzed by HTS were investigated. The results indicated that the catalyst prepared using SiO2 as binder exhibited better propylene oxide (PO) selectivity as compared with the catalyst prepared by Al2O3 binder. The PO selectivity and the effective utilization of hydrogen peroxide (H2O2) both decreased with the increase of reaction temperature. Using fixed-bed reactor, under the optimum reaction conditions of a reaction temperature of 40℃, a reaction pressure of 0.5 MPa, a molar ratio of propylene to H2O2 of 4, a molar ratio of methanol to H2O2 of 40, a WHSV of 12.5 h-1, the effective utilization rate of H2O2 reached 88.07%.