NATURE OF THE ACTIVE-SITES IN H-ZSM-11 ZEOLITE MODIFIED WITH ZN(2+) AND GA(3+)

被引：39
作者：
ANUNZIATA, OA
PIERELLA, LB
机构：
[1] Centro de lnvestigaciones Tecnologicas, GRUCOM, Facultad Regional Cordoba, Universidad Tecnologica Nacional, Cordoba, 5016
来源：
CATALYSIS LETTERS | 1993年 / 19卷 / 2-3期
关键词：
ZEOLITES; ZN-ZSM-11; GA-ZSM-11; ACTIVE CENTERS; XRD; IR; TPAD;
D O I：
10.1007/BF00771749
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：
H-ZSM-11 zeolite modified with zinc and gallium by ion exchange was investigated using XRD, IR and TPD of ammonia. The modification of the material by zinc produced a lowering of the strong Bronsted acidic sites generating new and strong Lewis sites. Unlike zinc-zeolites, the gallium is localized preferentially on the outer surface of microcrystallites blocking a few Bronsted centers.
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页码：143 / 151
页数：9
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