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以Beta分子筛为催化剂,系统考察了反应条件和催化剂酸性变化对甲苯和三甲苯烷基转移反应催化性能的影响.实验结果表明,反应条件、分子筛晶粒尺寸及其酸性对烷基转移催化活性和稳定性都具有显著影响.研究发现:当反应温度为450℃、压力为3 MPa以及反应物甲苯和三甲苯物质的量比为1时,二甲苯收率达到最高;分子筛催化活性随硅铝比升高而降低;催化剂晶粒尺寸减小能够显著提高反应稳定性.同时,还对甲苯和三甲苯烷基转移反应机理进行了深入研究,推导出了可能的反应机理路线图.
Using Beta zeolite as catalyst, the effects of reaction conditions and catalyst acidity on the catalytic performance of transalkylation of toluene and mesitylene were investigated systematically.The experimental results show that the reaction conditions, the size of zeolite and their acidity, The results showed that when the reaction temperature is 450 ℃, the pressure is 3 MPa and the molar ratio of toluene and mesitylene is 1, the yield of xylene reaches the highest. The catalytic activity of zeolite increases with the ratio of silica to alumina And the decrease of the catalyst grain size can significantly improve the reaction stability.At the same time, the reaction mechanism of toluene and toluene conversion was further studied, and a possible route of reaction mechanism was deduced.