TPD study of the reversible retention of carbon dioxide over montmorillonite intercalated with polyol dendrimers

被引：50

作者：

Azzouz, Abdelkrim ^{[1
]}

Ursu, Alina-Violeta ^{[2
]}

Nistor, Denisa ^{[2
]}

Sajin, Tudor ^{[2
]}

Assaad, Elias ^{[1
]}

Roy, Rene ^{[1
]}

机构：

[1] Univ Quebec, Dept Chem, Montreal, PQ H3C 3P8, Canada

[2] Bacau Univ, Catalysis & Microporous Mat Lab, Bacau, Romania

来源：

THERMOCHIMICA ACTA | 2009年 / 496卷 / 1-2期

关键词：

Montmorillonite; Polyol dendrimers; Organoclay; Thermal programmed desorption; Carbon dioxide; Reversible gas capture; VAPOR-PHASE INTERACTIONS; HOMOMORPHIC COMPOUNDS; COMPRESSED GASES; CO2; CAPTURE; NANOCOMPOSITES; SOLUBILITY; ADSORPTION; NITROGEN; ALCOHOLS; METHANE;

D O I：

10.1016/j.tca.2009.06.023

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Organoclays with improved affinity towards carbon dioxide were obtained via montmorillonite intercalation with polyol and amino dendrimers having respectively hydroxyl or amino groups that act as adsorbing sites. Measurements through thermal programmed desorption (TPD) show that higher amounts Of CO(2) than predicted by stoichiometry were retained by polyol organoclays, suggesting that more than one CO(2) molecule adsorb on each OH group. The latter displayed optimal base properties tailored for: (i) improved retention capacity of CO(2) by increasing their number: (ii) easy consecutive gas release upon slight heating owing to their weak basicity. Unlike amines, polyols display sufficiently weak basicity to exert only physical interaction towards carbon dioxide molecules. The reversible CO(2) adsorption-desorption equilibrium is discussed here in terms of acid-base interactions between the organoclay surface and surrounding CO(2) molecules. The results obtained herein open new prospects in obtaining microporous materials able to act as lungs that fix reversibly Polluting gases. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：45 / 49

页数：5

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