Vapor-phase tert-butylation of p-hydroxytoluene over Al-MCM-41 and PWA supported Al-MCM-41 mesoporous molecular sieve catalysts
- 作者：K. Rajasekar ; A. P ; urangan
- 关键词：p-hydroxytoluene ; Tertiarybutylation ; MTBE ; Phospotungstic acid (PWA) ; Heteropoly acid ; Butylated hydroxytoluene (BHT)
- 刊名：Catalysis Communications
- 出版年：2007
- 期刊代码：12_15667367
- 类别：ce
- 出版时间：April 2007
- 卷：8
- 期：4
- 页码：635-643
- 文件大小：711 K
摘要
Mesoporous Al-MCM-41 and PWA, impregnated with different weight percent catalysts have been prepared and investigated by combining structural and textural properties of both the catalysts. The catalytic behavior of both the Al-MCM-41 and PWA impregnated catalysts were evaluated for tert-butylation of p-hydroxy toluene. Among the series of catalysts, 20 wt%PWA impregnated catalyst was found to have superior activity for the alkylation of p-hydroxytoluene. The activity was increased with more PWA content upto 20 wt%. This implied that the PWA loaded Al-MCM-41catalysts had enhanced acid strength, thereby increasing the Bronsted acid sites for the tertiarybutylation of p-hydroxytoluene. Various parameters viz. feed rate, temperature, feed ratio of p-HT and MTBE, Time on stream and WHSV were optimized for the reaction.