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作 者:袁忠勇[1] 张怀彬[1] 王敬中[1] 李赫 董晋湘[2]
机构地区:[1]南开大学化学系催化研究室 [2]太原工业大学
出 处:《石油学报(石油加工)》1998年第2期28-31,共4页Acta Petrolei Sinica(Petroleum Processing Section)
基 金:国家自然科学基金
摘 要:以六亚甲基亚胺为模板剂,采用动态晶化水热法合成出MCM-22沸石。合成过程中容易生成混晶或转晶,适宜的Si/Al比为15~100。对MCM-22沸石进行了物相分析和红外光谱研究,同时考察了它的吸附性能和酸性。在HMCM-22沸石上进行间二甲苯异构化反应催化性能测试,显示出较高的催化活性。结果表明,MCM-22可能同时具有十元环和十二元环两种孔道,孔径分布图在平均孔径0.5nm处出现双峰,也证实它具有两种孔道体系。MCM22 zeolite was synthesized with hexamethyleneimine as the organic template,by hydrothermal motional crystallization method.Zeolite MCM22 can be synthesized as a pure material and as a mixture with MCM49 or,in some cases,contaminated with other products such as ferrierite or ZSM5.The framework topologe of MCM22 has been studied by XRD and IR measures.The adsorption property and acidity of MCM22 has also been studied.The isomerization of mxylene on the acidic MCM22 zeolite has been used as the model reaction of catalysis.The result shows that MCM22 has high catalytic activity and behaves like that of both 10and 12member ring zeolite.The pore size distribution curve of MCM22 (measured by N2 adsorption) shows bimodal pore distribution at average pore diameter of 05 nm which proves additionally that MCM22 has both 10and 12member ring pores.
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