Selective synthesis of para-para′-dimethyldiphenylmethane over H-beta zeolite

被引：22

作者：

Jin, Dingfeng ^{[1
]}

Hou, Zhaoyin ^{[1
]}

Zhang, Liwei ^{[1
]}

Zheng, Xiaoming ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Chem, Inst Catalysis, Hangzhou 310028, Peoples R China

来源：

CATALYSIS TODAY | 2008年 / 131卷 / 1-4期

基金：

中国国家自然科学基金;

关键词：

H-beta zeolite; dimethyldiphenylmethane; toluene; formaldehyde;

D O I：

10.1016/j.cattod.2007.10.049

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Selective synthesis of par-para'-dimethyidiphenylmethane (para-para'-DMDPM) from the condensation between toluene and formaldehyde was investigated over H-X, H-Y, H-ZSM-5, H-mordenite and MCM-41. Characterizations (NH3-TPD-MS and pore structure) disclosed that the catalytic activity of various zeolites depends mainly on its strong acid site and accessibility of the internal pores. H-beta zeolite, with a unique pore sized in 0.66 nm and higher proportion of stronger acid site, exhibited the highest activity and stereo-selectivity (86.5%). Small sized H-beta zeolite was more active due to the enhanced accessibility of its acid site, and this kind of zeolite remained a higher stereo-selectivity (> 80%) even at higher temperature, longer reaction time and recycle usage. The best yield of para-para'-DMDPM reached 71.1 % at 140 degrees C over H-beta zeolite and it could be used in recycle without loss of its structure, activity and stereo-selectivity. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：378 / 384

页数：7

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