摘要
主要对原位合成及后改性方法对ZSM-5分子筛酸性的调控进行归纳总结。原位合成法包括调控硅铝比、控制分子筛表面及体相铝分布,其中可通过改变模板剂类型、合成体系中有无钠离子以及改变硅源、铝源等方式控制铝分布来调控酸性;后处理法包括高温焙烧、水热处理、化学处理等脱铝方式和晶体外延生长、化学硅沉积、外表面毒化等控制外表面酸性来调控分子筛酸性。对分子筛酸性调控方法进行梳理,有利于深入理解不同反应对分子筛酸性的不同要求以及各改性方法对酸性的影响,为合理使用以上方法调控ZSM-5酸性达到最佳的催化性能提供借鉴。
The methods of acidity adjustment of ZSM - 5 zeolite were summarized including in situ synthe- sis and post - treatment methods. In - situ synthesis methods included adjustment of Si/A1 ratios and con- trol of aluminum distribution on crystal surface and in bulk, which could be realized by changing template types ,the synthesis system with or without sodium ions and the gel silicon, aluminum sources to control acidity. Post- treatment methods adjusted zeolite acidity by controlling outside surface acidity, including dealuminization methods （ high temperature calcination, hydrothermal treatment, chemical treatment） and external surface modification（ the crystal external surface epitaxial growth, chemical silicon deposition ,ex- ternal surface poisoning）. The summary was helpful to understand the various reaction requirements to ze- olite material acidity and the influence of each method on the acidity. It was beneficial to the improvement of catalytic performance with appropriate methods.
出处
《工业催化》
CAS
2017年第10期5-12,共8页
Industrial Catalysis
关键词
催化化学
ZSM-5分子筛
原位合成
后改性
酸性
catalytic chemistry
ZSM - 5 zeolite
in - situ synthesis
post - treatment
acidity
