Thermodynamics of Carbon Dioxide Asdorption on the Protonic Zeolite H-ZSM-5

被引：27

作者：

Armandi, Marco ^{[1
,2
]}

Garrone, Edoardo ^{[1
,2
]}

Arean, Carlos O. ^{[3
]}

Bonelli, Barbara ^{[1
,2
]}

机构：

[1] Politecn Torino, Dept Mat Sci & Chem Engn, I-10129 Turin, Italy

[2] Torino Politecn, INSTM Unit, I-10129 Turin, Italy

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

来源：

CHEMPHYSCHEM | 2009年 / 10卷 / 18期

关键词：

adsorption; carbon dioxide fixation; thermodynamics; VTIR spectroscopy; zeolites; TEMPERATURE INFRARED-SPECTROSCOPY; EXCHANGED ZSM-5 ZEOLITES; SWING ADSORPTION; HYDROGEN ADSORPTION; CO2; CAPTURE; IR; NA-ZSM-5; STORAGE;

D O I：

10.1002/cphc.200900561

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：

Adsorption of carbon dioxide on H-ZSM-5 zeolite (Si:Al= 11.5:1) was studied by means of variable-temperature FT-IR spectroscopy, in the temperature range of 310-365 K. The adsorbed CO2 molecules interact with the zeolite Bronsted-acid OH groups bringing about a characteristic red-shift of the O-H stretching band from 3610 cm(-1) to 3480 cm(-1). Simultaneously, the v(3) mode of adsorbed CO2 is observed at 2345 cm(-1). From the variation of integrated intensity of the IR absorption bands at both 3610 and 2345 cm(-1), upon changing temperature (and CO2 equilibrium pressure), the standard adsorption enthalpy of CO2 on H-ZSM-5 is Delta H-0=-31.2(+/- 1)kJ mol(-1) and the corresponding entropy change is Delta S-0 = -140(+/- 10) J mol(-1)K(-1). These results are discussed in the context of available data for carbon dioxide adsorption on other protonic, and also alkali-metal exchanged, zeolites.

引用

页码：3316 / 3319

页数：4

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