Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 167, Issue -, Pages 44-50Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2012.05.026
Keywords
Mesoporous adsorbents; SBA-15 silica; Introducing of MgO and K2CO3; Adsorption of CO2
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Funding
- Grant Agency of the Czech Republic [203/08/0604]
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Mesoporous adsorbents for carbon dioxide capture were prepared by introducing of magnesium oxide and potassium carbonate into SBA-15, SBA-16 silicas and MCM-48-like-silica. In order to avoid destruction of silica supports, a novel procedure based on the precipitation of magnesium acetate on the silica surface was developed. Subsequent in situ chemical conversion of magnesium acetate provided magnesium oxalate, while final magnesium oxide was formed by calcination. To introduce potassium carbonate, silica modified with MgO was impregnated with potassium oxalate followed by its conversion to carbonate. All prepared mesoporous adsorbents preserved characteristic features of mesoporous molecular sieve. The comparison of carbon dioxide isotherms obtained on prepared samples reveals that their adsorption properties are decisively influenced by the type of mesoporous structure. Modified sample of SBA-15 silica has shown the most steep adsorption isotherm and higher CO2 adsorption capacity than adsorption capacity of samples prepared from SBA-16 and MCM-48-ls silicas. (C) 2012 Elsevier Inc. All rights reserved.
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