摘要
在 4 0℃和常压下 ,于 0 .36 mol/ L的 HCl溶液中合成了 n( Si) / n( Ti)分别为 30、5 0和 70的超微粒分子筛 Ti-MCM-4 1。经 XRD、FTIR和 SEM表征 ,该分子筛具有规则的骨架结构 ,颗粒直径在 0 .0 5～ 0 .1 0 μm之间。同时研究了该分子筛在苯乙烯与 H2 O2 液相氧化反应中的催化行为。结果表明 ,提高分子筛中 Ti含量 ,加入助催化剂 Li Cl、K2 SO4和 Na NO3 ,提高 n( H2 O2 ) / n(苯乙烯 )比 ,以甲醇为溶剂 ,延长反应时间 ,提高反应温度 ,均能提高苯乙烯的转化率。考察了不同反应时间苯乙烯氧化的反应速率。
The ultrafine molecular sieve Ti-MCM-41 with molar ratios of Si to Ti being 30, 50 and 70 respectively were prepared from a 0.36 mol/L HCl solution at 40 ℃ and normal pressure. The molecular sieves were proved to have a regular skeleton structure with diameters ranged in 0.05 to 0.1 μm as determined by XRD, FTIR and SEM techniques. The catalytic activity of the molecular sieves Ti-MCM-41 in the oxidation of styrene by hydrogen peroxide was examined. The results showed that the styrene conversion was improved by increasing the titanium content, adding the promoter such as LiCl, K 2SO 4 and NaNO 3, using methanol as a solvent as well as extending the reaction time and raising the reaction temperature.
出处
《应用化学》
CAS
CSCD
北大核心
2002年第12期1137-1141,共5页
Chinese Journal of Applied Chemistry
基金
辽宁省自然科学基金资助项目 ( 972 0 5 2 )
