载钛催化剂的气固相法制备及其在环氧化氯丙烯反应中的催化活性

利用TiCl4气固相法，以含硅物质为原料，制备了7种钛硅氧化物类催化剂，并考察了其在H2O2环氧化氯丙烯反应中的催化活性。实验结果表明：只有以HZSM-5为载体制备的催化剂具有催化环氧化活性。酸处理HZSM-5对催化剂活性的影响并不大，分子筛的硅铝比和气固相反应时间是影响其催化活性的重要因素，且催化活性随着硅铝比的降低而降低。气固相反应时间16h时，催化剂的活性最高。

Preparation of Ti-charged Catalysts and Their Catalytic Activity in Epoxidation of Allyl Chloride

Several kinds of Ti-charged catalysts were prepared from the corresponding raw materials by TiCl_4 gas-solid method,and their catalytic performances were also investigated by epoxidation of allyl chloride.Although titanium is found to exist in each catalyst,only the sample prepared from HZSM-5 has catalytic activity in epoxidation.The further studies showed that acid-pretreatment of HZSM-5 has little effect on their catalytic activity.However,the SiO_2/Al_2O_3 mole ratio of HZSM-5 and the time of TiCl_4 reacts with HZSM-5 are found to be important factors.The activity of Ti-charged HZSM-5 in epoxidation goes down with the decrease of SiO_2/Al_2O_3 mole ratio.The time of gas-solid reaction also influences the activity: the activity increases in the first 14 h,and reaches a maximum at 16 h,then decreases.