COMPARATIVE IR-SPECTROSCOPIC STUDY OF LOW-TEMPERATURE H2 AND CO ADSORPTION ON NA ZEOLITES

被引:130
作者
BORDIGA, S
GARRONE, E
LAMBERTI, C
ZECCHINA, A
AREAN, CO
KAZANSKY, VB
KUSTOV, LM
机构
[1] DIPARTIMENTO CHIM FIS CHIM INORGAN & CHIM MAT, VIA PEITRO GIURIA 7, I-10125 TURIN, ITALY
[2] UNIV ISLAS BLAEARES, DEPT QUIM, E-07071 PALMA DE MALLORCA, SPAIN
[3] N D ZELINSKY ORGAN CHEM INST, MOSCOW, RUSSIA
[4] INFN, SEZ TORINO, TURIN, ITALY
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1994年 / 90卷 / 21期
关键词
D O I
10.1039/ft9949003367
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
Extraframework cation sites in the sodium forms of the zeolites ZSM-5, mordenite, Linde-4A and faujasite-type X and Y have been investigated by using low-temperature adsorption of dihydrogen and carbon monoxide as IR spectroscopic probes. The extent of H-H and C-O bond polarization was found to be dependent not only on the cation electrostatic field, but also on the neighbouring oxygen atoms of the zeolite framework. The influence of these oxygen atoms is most keenly felt by adsorbed molecular hydrogen, but they also affect the IR frequency shift of the stretching vibration of adsorbed carbon monoxide. The Si : Al ratio of the zeolite framework modulates the basic strength of the oxygen atoms, and this was found to be reflected in the IR stretching frequency of both adsorbed molecules, H2 and CO.
引用
收藏
页码:3367 / 3372
页数:6
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