Para-selectivity of modified HZSM-5 zeolites by nitridation for ethylation of ethylbenzene with ethanol

被引：38

作者：

Guan, XX ^{[1
]}

Li, N ^{[1
]}

Wu, GJ ^{[1
]}

Chen, JX ^{[1
]}

Zhang, FX ^{[1
]}

Guan, NJ ^{[1
]}

机构：

[1] Nankai Univ, Coll Chem, Inst New Catalyt Mat Sci, Tianjin 300071, Peoples R China

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2006年 / 248卷 / 1-2期

关键词：

nitridation; HZSM-5; zeolite; modification; para-selectivity; ethylation of ethylbenzene with ethanol;

D O I：

10.1016/j.molcata.2005.12.032

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：

The modification of HZSM-5 zeolite was carried out by nitridation of commercial HZSM-5 zeolites with flowing pure ammonia at high temperature. The modified HZSM-5 zeolites maintained high crystallinity and high specific surface areas of precursors testified by XRD, BET and SEM analysis. Compared with parent HZSM-5, the surface strong acid sites of modified HZSM-5 zeolites decreased severely as characterized by means of NH3-TPD analysis and pyridine-IR spectroscopy shows that nitridation mainly occurred in Bronsted acid sites. The modified HZSM-5 zeolites exhibited much higher selectivity to para-diethylbenzene (DEB) and significantly enhanced stability than parent HZSM-5 when applied in the reaction of ethylbenzene ethylation with ethanol. The reduction of strong acid sites can suppress the isomerization of para-diethylbenzene and improve the para-selectivity. The effects of nitrogen contents in modified zeolites on the conversion and selectivity to p-DEB were also studied. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：220 / 225

页数：6

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