4.7 Article

Selective adsorption of carbon dioxide over nitrogen on calcined synthetic hectorites with tailor-made porosity

Journal

APPLIED CLAY SCIENCE
Volume 46, Issue 1, Pages 109-113

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2009.07.009

Keywords

Synthetic hectorites; Adsorption; Carbon dioxide; Nitrogen; Selectivity

Funding

  1. Council of Scientific and Industrial Research (CSIR) [NWP 0010]

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Hectorites were synthesized using 1-butyl-3-methylimidazolium bromide, 1,3-didecyl-2-methylimidazolium chloride and 1-decyl-3-methylimidazolium chloride as synthesis directing agents at condensation temperature for 48 h. Calcinations of synthetic hectorites resulted mesoporous materials with pore diameters ranging from 3A to 5.5 nm. The pore diameters depended on the directing agent. Synthetic and calcined hectorites were characterized by powder X-ray diffraction. Adsorption properties of CO2 and N-2 on calcined hectorites were investigated by volumetric measurements. The adsorption capacity for CO2 and N-2 decreased with increasing pore diameter. The calcined hectorites showed very good selectivity for CO2 over N-2 at lower as well as higher partial pressure at 303 K. (C) 2009 Elsevier B.V. All rights reserved.

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