Variable-temperature IR spectroscopic studies of CO adsorbed on Na-ZSM-5 and Na-Y zeolites

被引：57

作者：

Tsyganenko, AA ^{[1
]}

Platero, EE

Areán, CO

Garrone, E

Zecchina, A

机构：

[1] St Petersburg State Univ, Inst Phys, St Petersburg 198904, Russia

[2] Univ Illes Balears, Dept Quim, E-07071 Palma de Mallorca, Spain

[3] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy

来源：

CATALYSIS LETTERS | 1999年 / 61卷 / 3-4期

关键词：

carbon monoxide adsorption; heterogeneous catalysis; IR spectroscopy; zeolites;

D O I：

10.1023/A:1019089309446

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：

CO interacts with extra-framework alkali metal cations (M+) of zeolites to form both M+... CO and M+... OC species. By using variable-temperature FTIR spectroscopy, these C-bonded and O-bonded species were found to be in a temperature-dependent equilibrium. For the same cation, the difference in interaction energy depends upon the zeolite framework. Thus, for the equilibrium process ZNa(+)... CO reversible arrow ZNa(+)... OC, where Z represents the zeolite framework, delta H-0 was found to take the values 3.8 and 2.4 kJ mol(-1) for CO/Na-ZSM-5 and CO/Na-Y, respectively. The C-bonded species show always the highest cation-CO interaction energy.

引用

页码：187 / 192

页数：6

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