化工进展2012，Vol.31Issue(1)：112-116,121,6.
ZSM-5/MCM-41复合分子筛的制备及对乙醇脱水的催化活性
Preparation of micro/mesoporous ZSM-5/MCM-41 composite molecular sieve and its catalytic performance on the dehydration of ethanol
姜健准 1亢宇 1张明森1
作者信息
- 1. 中国石油化工股份有限公司北京化工研究院,北京100013
- 折叠
摘要
Abstract
Micro/mesoporous ZSM-5/MCM-41 composite molecular sieves were prepared with commercial ZSM-5 zeolite as silica-alumina sources by the treatment of aqueous NaOH solution and with further hydrothermal crystallization using cetyltrimethylammonium bromide（CTMAB）as a structure-directing agent.The influence of various parameters,especially the temperature of the treatment and/or that of the crystallization processes on the crystallization and the morphology of the micro/mesoporous composites has been investigated.The obtained composite materials were further prepared to become catalysts and their catalytic performance on the dehydration of ethanol was carefully illustrated.The results show that micro/mesoporous ZSM-5/MCM-41 composite can be successfully obtained by a two-step method and the optimal condition is that ZSM-5 zeolite was firstly treated at 110 ℃ in a 2.0 mol/L aqueous NaOH solution for 20 h and further crystallized under 110℃ for 20h.H-type catalysts were prepared by ion exchange of the prepared micro/mesoporous ZSM-5/MCM-41 composite with NH4NO3 solution.They show wonderful catalytic performance on the dehydration of ethanol.The conversion of ethanol and the selectivity of ethylene is up to 99% and 96% respectively when the reaction temperature ranges from 240 to 255 ℃ under 0.5 h-1 weight hourly space velocity（WHSV）of ethanol.关键词
ZSM-5/MCM-41/乙醇/乙烯/脱水Key words
ZSM-5/MCM-41/ethanol/ethylene/dehydration分类
化学化工引用本文复制引用
姜健准,亢宇,张明森..ZSM-5/MCM-41复合分子筛的制备及对乙醇脱水的催化活性[J].化工进展,2012,31(1):112-116,121,6.
