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...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。展开更多
A simple, quick, sensitive, accurate and precise method has been developed for evaluating the catalytic active sites of titanium silicalite-1 (TS-1). The catalytic active sites of titanium silicalite zeolite depend on...A simple, quick, sensitive, accurate and precise method has been developed for evaluating the catalytic active sites of titanium silicalite-1 (TS-1). The catalytic active sites of titanium silicalite zeolite depend on the effectively active species (EAS) in TS-1 which react with specific substrates quickly. However, the EAS was hard to be evaluated with conventional instruments and techniques in the past. In this paper, the EAS was formed in TS-1 upon interaction with H2O2, and its presence could be confirmed by UV-vis spectroscopy which has an absorption peak at 385 nm. The absorbance at 385 nm was found to be linearly related to time, and when the absorbance and the increasing rate of absorbance (k) increased, the catalytic performance of TS-1 enhanced.展开更多
文摘以钛硅分子筛(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。
文摘A simple, quick, sensitive, accurate and precise method has been developed for evaluating the catalytic active sites of titanium silicalite-1 (TS-1). The catalytic active sites of titanium silicalite zeolite depend on the effectively active species (EAS) in TS-1 which react with specific substrates quickly. However, the EAS was hard to be evaluated with conventional instruments and techniques in the past. In this paper, the EAS was formed in TS-1 upon interaction with H2O2, and its presence could be confirmed by UV-vis spectroscopy which has an absorption peak at 385 nm. The absorbance at 385 nm was found to be linearly related to time, and when the absorbance and the increasing rate of absorbance (k) increased, the catalytic performance of TS-1 enhanced.
