ACIDIC DEGRADATION OF ZEOLITE CATALYSTS IN THE COURSE OF AROMATIC CHLORINATION USING SULFURYL CHLORIDE

被引:14
作者
ANTENUCCI, D
DELAUDE, L
FRANSOLET, AM
LASZLO, P
机构
[1] UNIV LIEGE,INST CHIM ORGAN B6,CHIM FINE INTERFACES LAB,B-4000 LIEGE,BELGIUM
[2] UNIV LIEGE,INST MINERAL B18,MINERAL LAB,B-4000 LIEGE,BELGIUM
关键词
D O I
10.1016/0021-9517(92)90271-I
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 structural changes of two faujasite-type zeolites in the course of aromatic chlorinations by sulfuryl chloride, SO2Cl2, were investigated by X-ray powder diffraction. Both catalysts examined, the NaX zeolite, which promotes catenary side-chain chlorination, and the ZF520 zeolite, which promotes nuclear electrophilic chlorination, are strongly altered in the acidic reaction medium (hydrochloric acid and sulfur dioxide are evolved continually as the reaction proceeds). In the presence of residual humidity, progressive dealumination of the ZF520 catalyst occurs without destruction of the zeolite framework. It gives rise to the formation of an alum type structure, for which the molecular formula (H3O)Al(SO4)2 · 12H2O has been suggested. Rapid degradation of the NaX zeolite is accompanied by the formation of sodium chloride and of the sodium aluminium sulfate hexahydrate, NaAI(SO4)2 · 6H2O. These compounds indeed catalyze the side-chain chlorination of toluene by SO2Cl2. Under water exclusion, structural degradation of both zeolites is slowed down and formation of hydrated sulfates is prevented; however, the efficiency of the catalysts is also reduced. © 1992.
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页码:92 / 98
页数:7
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