【摘要】 以钛硅分子筛(TS-1)经重排扩孔得到的空心钛硅分子筛(HTS)为催化剂、乙酸[36%(w),下同]为溶剂,考察了不同因素对甲苯与双氧水氧化反应制甲基苯酚(甲酚)的影响。结果表明:乙酸对该反应具有明显的促进作用;初期反应主要发生在分子筛的外表面;随着反应的进行,分子筛孔道中反应增加;在优化的反应条件下,甲苯转化率达15.1%,甲酚选择性超过95.0%,对位/邻位产物收率比约为1.28。更多还原

【Abstract】 Cresol is an important chemical intermediate which is mainly produced through complicated and pollutant traditional methods. While titanium silicalite(TS-1) catalyzed toluene oxidation using hydrogen peroxide as oxidant is a clean route for cresol synthesis. This study investigated the effects of different factors on toluene and hydrogen peroxide reaction,using HTS as catalyst which is recrystalized from TS-1 zeolite and acetic acid[36%(w)]as solvent. The results showed that acetic acid[36%(w)] was effective for promoting the reaction. The oxidation occurred mainly at the outside of the zeolite in early reaction stage,while more reaction was taken place inside the channels of the zeolite as the reaction proceeds. Under optimized conditions,the toluene conversion rate,the selectivity of cresol and the molar ratio of para-cresol/ortho-cresol of cresol product reached to 15.1%,95.0%,1.28,respectively.更多还原