The reaction mechanism of C-6 hydrocarbons over acid-base bifunctional catalysts, TiO2-ZrO2

被引:35
作者
Fung, J [1 ]
Wang, I [1 ]
机构
[1] NATL TSING HUA UNIV,DEPT CHEM ENGN,HSINCHU,TAIWAN
关键词
D O I
10.1006/jcat.1996.0372
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
This study examined the relation between the acid-base properties of a binary oxide, TiO2-ZrO2, and the reaction behavior of various C-6 hydrocarbons over this mixed oxide. Based on experimental results, both the strong acid sites and the strong base sites performed as cracking sites and could be poisoned by doping a small amount of K2O and B2O3, respectively. It was demonstrated that the paired acid-base sites played most important roles on dehydrogenation of cyclohexane and cyclization of n-hexane and hexene. Both the yield and selectivity of benzene increased with the relative paired acid-base amount. The results of isomerization of 1-hexene showed that the yield of the molecular isomerization increased at the expense of the double bond migration as the relative acid/base ratio increased. The results also showed that 2-hexene had a much higher aromatization rate than 1-hexene over TiO2-ZrO2 catalysts. A detailed reaction mechanism of the aromatization C-6 hydrocarbons over an acid-base bifunctional catalyst is proposed, which was different from the mechanism of a conventional metal-acid bifunctional catalysts. (C) 1996 Academic Press, Inc.
引用
收藏
页码:166 / 172
页数:7
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