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检索条件"主题词=porous montmorilloniteheterostructures"
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Alkylation of Catechol with tert-Butyl Alcohol Catalyzed by Mesoporous Acidic Montmorillonite Heterostructure Catalysts
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Chinese Journal of Chemical Engineering 2004年 第3期12卷 388-394页
作者： 周春晖 葛忠华 李小年 童东绅 李庆伟 郭红强 College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310032China College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310032Chinahe liquid phase alkylation of catechol with tert-butyl alcohol to produce 4-tert-butyl catechol (4-TBC) was carried out over MCM-41 HZSM-5 H-exchanged montmorillonite and novel acidic porous montmorillonite heterostructures (PMHs). Upon all catalysts tested 4-TBC is the main product and 3-tert-butyl catechol (3-TBC) and 35-di-tert-butyl catechol are the side products. The synthetic PMHs showed higher conversion of catechol and better selectivity to 4-TBC compared to other solid acid catalysts tested. Over the PMHs derived from H-exchanged montmorillonite through template extraction processes the suitable reaction temperature is ca 410 K the ratio of catechol to iert-butyl alcohol is 1:2. Increasing the amount of catalyst (lower weight hourly space velocity) can improve the conversion of catechol and influence the selectivity slightly. The reasonable reaction time is ca 8 h. The type and strength of acidity of H-montmorillonite and PMH were determined by pyridine adsorption FT-IR and ammonia temperature-programmed desorption techniques. The medium and strong acid sites are conducive to producing 4-TBC and the weak acid sites to facilitating the 3-TBC formation. The differences between the PMHs from calcination and those from extraction are attributed to proton migration and acidity change in the gallery surface.
The liquid phase alkylation of catechol with tert-butyl alcohol to produce4-tert-butyl catechol (4-TBC) was carried out over MCM-41, HZSM-5, H-exchanged montmorillonite andnovel acidic porous montmorillonite heterostr... 详细信息
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