The di-t-butylation of p-cresol with t-butanol in supercritical CO2 over tungstophosphoric acid supported on ordered mesoporous silica

被引：6

作者：

Kamalakar, G ^{[1
]}

Komura, K ^{[1
]}

Sugi, Y ^{[1
]}

机构：

[1] Gifu Univ, Fac Engn, Dept Mat Sci & Technol, Gifu 5011193, Japan

来源：

CATALYSIS LETTERS | 2006年 / 108卷 / 1-2期

基金：

日本学术振兴会;

关键词：

t-butylation; tungstophosphoric acid; MCM-41; supercritical CO2; p-cresol; 2,6-di-t-butyl-4-methylphenol;

D O I：

10.1007/s10562-006-0032-z

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Tungstophosphoric acid (HPW) supported on MCM-41 was an excellent catalyst for the t-butylation of p-cresol to 2,6-di-t-butyl-4-methylphenol (2,6-DTBPC) in supercritical CO2; however, zeolites, H-Y and H-Beta, only gave 2-t-butyl-4-methylphenol (2-TBPC) because of their limitation in pore size. The yield of 2,6-DTBPC was maximized at 110 degrees C, and further increase in temperature rather decreased the yield. The yield of 2,6-DTBPC was maximized at 10-11 MPa CO2 pressure, and further increase of the pressure decreased in the conversion of phenol and the yield of 2,4-DTBC. The thermogravimetric analysis of used catalysts showed that the coke-formation was minimized in supercritical CO2 compared to the other reaction media such as in liquid phase and in N-2 atmosphere.

引用

页码：31 / 35

页数：5

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