FORMATION OF CONJUGATED IMINIUM IONS FROM PYRIDINE ON DEALUMINATED MAZZITE

被引:32
作者
CHICHE, BH
FAJULA, F
GARRONE, E
机构
[1] ENSCM, CHIM ORGAN PHYS & CINET CHIM APPL LAB,CNRS, URA 418,8 RUE ECOLE NORMALE, F-34053 MONTPELLIER, FRANCE
[2] UNIV TURIN, DIPARTIMENTO CHIM INORGAN CHIM FIS & CHIM MAT, I-10125 TURIN, ITALY
关键词
D O I
10.1006/jcat.1994.1083
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
High-temperature contact of pyridine with the surface of dealuminated mazzite leads to the appearance of infrared bands at 2914, 2848, 1496, and 1462 cm-1, and to an ultraviolet signal at 205 nm, distinct from those attributable to pyridinium ions and coordinated pyridine. It is proposed that the species responsible for these features correspond to conjugated iminium ions (dihydro-pyridinium ions) formed by a nucleophilic attack and protonation of pyridine molecules adsorbed on Lewis sites. Their formation would then involve the participation of strong Lewis/Bronsted pairs of sites that could correspond to the superacid site often invoked in zeolitic materials. (C) 1994 Academic Press, Inc.
引用
收藏
页码:460 / 467
页数:8
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