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Effect of nonframework cations and crystallinity on the basicity of NaX zeolites

被引：58
作者：
Joshi, UD
Joshi, PN
Tamhankar, SS
Joshi, VV
Rode, CV
Shiralkar, VP
机构：
[1] Netaji Subhashchandra Bose Coll, Nanded 431601, India
[2] Natl Chem Lab, Pune 411008, Maharashtra, India
[3] Coll Sci, Nanded 431602, India
来源：
APPLIED CATALYSIS A-GENERAL | 2003年 / 239卷 / 1-2期
关键词：
NaX zeolite; nonframework cations; Lewis basicity; cation kinetic diameter; knoevenagel condensation; ball milling; crystallinity; basicity;
D O I：
10.1016/S0926-860X(02)00391-5
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 basic character of NaX-type zeolites was systematically altered by incorporating nonframework K+, Rb+ and Cs+ cations with ([M]/([M]+[Na]) ca. similar to0.55). Correlation between activity and basicity was established. The role of Lewis basicity was found to be more important than the changes in specific area or micropore volume of different cation-exchanged samples in deciding the catalyst activity in the Knoevenagel condensation reaction. The catalyst activity was found to decrease with lowering the degree of crystallinity in the case of NaX zeolites. (C) 2002 Published by Elsevier Science B.V.
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页码：209 / 220
页数：12
相关论文
共 37 条
[1]   BASICITY AND BASIC CATALYTIC PROPERTIES OF ZEOLITES [J].
BARTHOMEUF, D ;
COUDURIER, G ;
VEDRINE, JC .
MATERIALS CHEMISTRY AND PHYSICS, 1988, 18 (5-6) :553-575
[2]   Basic zeolites: Characterization and uses in adsorption and catalysis [J].
Barthomeuf, D .
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1996, 38 (04) :521-612
[3]  
Barthomeuf D., 1988, STUD SURF SCI CATAL, P365
[4]  
Breck D.W, 1974, ZEOLITE MOL SIEVES
[5]   BASE CATALYSIS FOR FINE CHEMICALS PRODUCTION - CLAISEN-SCHMIDT CONDENSATION ON ZEOLITES AND HYDROTALCITES FOR THE PRODUCTION OF CHALCONES AND FLAVANONES OF PHARMACEUTICAL INTEREST [J].
CLIMENT, MJ ;
CORMA, A ;
IBORRA, S ;
PRIMO, J .
JOURNAL OF CATALYSIS, 1995, 151 (01) :60-66
[6]   Aluminophosphates oxynitrides as base catalysts: Nature of the base sites and their catalytic implications [J].
Climent, MJ ;
Corma, A ;
Fornes, V ;
Frau, A ;
GuilLopez, R ;
Iborra, S ;
Primo, J .
JOURNAL OF CATALYSIS, 1996, 163 (02) :392-398
[7]  
CORMA A, 1991, STUD SURF SCI CATAL, V59, P503
[8]   ALKALINE-SUBSTITUTED SEPIOLITES AS A NEW TYPE OF STRONG BASE CATALYST [J].
CORMA, A ;
MARTINARANDA, RM .
JOURNAL OF CATALYSIS, 1991, 130 (01) :130-137
[9]   ZEOLITES AS BASE CATALYSTS - CONDENSATION OF ALDEHYDES WITH DERIVATIVES OF MALONIC ESTERS [J].
CORMA, A ;
FORNES, V ;
MARTINARANDA, RM ;
GARCIA, H ;
PRIMO, J .
APPLIED CATALYSIS, 1990, 59 (02) :237-248
[10]   APPLICATION OF SOLID BASE CATALYSTS IN THE PREPARATION OF PREPOLYMERS BY CONDENSATION OF KETONES AND MALONONITRILE [J].
CORMA, A ;
MARTINARANDA, RM .
APPLIED CATALYSIS A-GENERAL, 1993, 105 (02) :271-279
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