CATALYST DEACTIVATION OF HIGH-SILICA HZSM-5 IN THE BECKMANN REARRANGEMENT REACTION OF CYCLOHEXANONE OXIME

被引:20
作者
TAKAHASHI, T
NISHI, M
TAGAWA, Y
KAI, T
机构
[1] Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, Kagoshima
来源
MICROPOROUS MATERIALS | 1995年 / 3卷 / 4-5期
关键词
BECKMANN REARRANGEMENT; CYCLOHEXANONE OXIME; HZSM-5; ZEOLITE; BORON-MODIFIED HZSM-5 ZEOLITE; CATALYST DEACTIVATION; EFFECT OF SIO2/AL2O3 RATIO;
D O I
10.1016/0927-6513(94)00059-5
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The Beckmann rearrangement of cyclohexanone oxime was carried out over high-silica HZSM-5 zeolites and boron-modified HZSM-5 to elucidate the effects of silica/alumina ratio and boron modification on the catalyst deactivation rate. The relationship between cyclohexanone oxime conversion and time on stream could be represented by the equation x(t)=x(0). exp(-b . t) where x(t) and x(0) are conversions at a time on stream t and at the initial stage t= 0, respectively, and b is the deactivation coefficient. The deactivation coefficient increased with increasing concentration of strong acid sites. When the deactivated zeolites were evacuated under a pressure of 1 Torr at 573 K for 5 h, the catalytic activity was recovered up to 50% of the initial activity. The deactivation of the ZSM-5-type zeolite was mainly due to the adsorption of volatile material on the acid sites.
引用
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页码:467 / 471
页数:5
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