摘要
首次在三相条件下，在Ｂｅｔａ沸石催化剂上研究了苯酚与异丁烯烷基化合成对叔丁基苯酚和２，４－二叔丁基苯酚。通过对Ｈｂｅｔａ沸石高温焙烧和吡啶中毒试验研究了烷基化反应活性和选择性的变化规律；用ＮＨ３－ＴＰＤ和Ｐｙ－ＩＲ测定了试样的酸量和酸种类，结果表明Ｈｂｅｔａ沸石具有很好的烷基化活性，苯酚的转化率可达９２％，经１１２３Ｋ焙烧后苯酚转化率为８８％，对叔丁基苯酚和２，４－二叔丁基苯酚的选择性分别为７０～７５％和１４～２０％，中等强度的Ｂｒｎｓｔｅｄ酸是苯酚与异丁烯烷基化反应的活性中心。
The alkylation of phenol with isobutene to para BXtert -tutyl phenol ( p -TBP) and 2,4-di- tert -butyl phenol (2,4-DTBP) has been studied under ternary phase conditions over beta zeolite catalysts for the first time The influences of high temperature calcination and pyridine poisoning on the catalytic performance of beta zeolite were investigated, and the surface acidity of the catalysts was evaluated by means of NH3-TPD and Py-IR methods It revealed that fresh Hbeta zeolite exhibited high activity in the alkylation of phenol with isobutene After calcination at 1123K it decreased slightly, ie, phenol conversion changed from 92% to 88% for p -TBP and 2,4-DTBP selectivities of 6775% and 1520%, respectively High temperature calcination promoted the selective formation of 2,4-DTBP on the consumption of pBZ-TBP Adsorption of pyridine at low content (<3W%) resulted in little change of the phenol conversion and the product distribution, while at high content the selectivity of 2,4-DTBP kept steady but the phenol conversion and the selectivity of p -TBP decreased Medium strong Brnsted acid sites were active centers in the alkylation of phenol with isobutene, and the assistance of surface Lewis acid sites at a certain population enhanced the selectivities of p -TBP and 2,4-DTBP Bondant content with <30% (W) shew almost no effect on the conversion of phenol
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第3期225-228,共4页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金
关键词
苯酚
烷基化
对叔丁基苯酚
二叔丁基苯酚
沸石
alkylation of phenol, para tertWTBZ-butyl phenol, 2,4-di- tert -butyl phenol, beta zeolite
