论文部分内容阅读
通过水热合成法制备出不同Si/Al比的介孔分子筛Al-MCM-41,并用浸渍法制得SO42-/Al-MCM-41固体酸催化剂.利用XRD、N2吸附、红外、吡啶吸附红外等手段对其进行了表征.吡啶吸附红外分析发现催化剂存在质子酸活性中心,而无路易斯酸活性中心.将该固体酸催化剂分别用于1,4-二甲氧基苯和苯甲醚的乙酰化反应,考察了催化剂用量、反应温度、反应时间和底物与乙酸酐的配比等因素对底物转化率和产品选择性的影响.在优化反应条件下,SO42-/Al-MCM-41(30)催化苯甲醚乙酰化反应的转化率达到80.6%,选择性为94%.
The mesoporous molecular sieves Al-MCM-41 with different Si / Al ratios were prepared by hydrothermal synthesis and the solid acid catalysts SO42- / Al-MCM-41 were prepared by impregnation method. The effects of XRD, N2 adsorption, infrared and pyridine adsorption on infrared The results of pyridine adsorption infrared analysis showed that there was proton acid active center in the catalyst without Lewis acid active center.The acetylation of 1,4-dimethoxybenzene and anisole The effects of the amount of catalyst, reaction temperature, reaction time and the ratio of substrate to acetic anhydride on the substrate conversion and product selectivity were investigated.Under the optimal reaction conditions, SO42- / Al-MCM-41 ( 30) catalyzed anisole acetylation reaction conversion rate of 80.6%, the selectivity of 94%.