Variable-temperature infrared spectroscopy studies on the thermodynamics of CO adsorption on the zeolite Ca-Y

被引：12

作者：

Bonelli, Barbara ^{[1
,2
]}

Otero Arean, Carlos ^{[3
]}

Armandi, Marco ^{[1
,2
]}

Rodriguez Delgado, Montserrat ^{[3
]}

Garrone, Edoardo ^{[1
,2
]}

机构：

[1] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10126 Turin, Italy

[2] Torino Politecn, INSTM Unit, I-10126 Turin, Italy

[3] Univ Islas Baleares, Dept Quim, Palma de Mallorca 07122, Spain

来源：

CHEMPHYSCHEM | 2008年 / 9卷 / 12期

关键词：

adsorption; carbon monoxide; metal oxides; thermodynamics; zeolites;

D O I：

10.1002/cphc.200800238

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：

Variable temperature FT-IR spectroscopy (in the range of 298-380 K) is used to study the thermodynamics of formation of Ca2+...CO carbonyl species upon CO adsorption on the faujasite-type zeolite Ca-Y and also the (temperature-dependent) isomerization equilibrium between carbonyl and isocarbonyl (Ca2+...OC) species. The standard enthalpy and entropy changes involved in formation of the monocarbonyl species resulted to be Delta H-0= -50.3 (+/- 0.5) kJ mol(-1) and Delta S-0 =-186 (+/-5) Jmol(-1) K-1, respectively. Isomerization of the (C-bonded) Ca2+...CO carbonyl to yield the (O-bonded) Ca2+...OC isocarbonyl involves an enthalpy change Delta H-iso(0) = + 11.4 (+/- 1.0) kJ mol(-1). These results are compared with previously reported data for the CO/Sr-Y system; and also, a brief analysis of enthalpy-entropy correlation for CO adsorption on zeolites and metal oxides is given.

引用

页码：1747 / 1751

页数：5

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