Publication Type Journal Article
Title Adsorption of gases and vapours in silica based xerogels
Authors Joana Fernandes Ana C. Fernandes Jesus C. Echeverria Paula Moriones Julian J. Garrido J. M. P. Silva
Groups CE
Journal COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Year 2019
Month January
Volume 561
Number
Pages 128-135
Abstract In spite of the outstanding adsorption properties of microporous silica and hybrid silica xerogels, the selectivity of these materials towards gases and vapours has been studied to a little extent. In this work we studied selected silica and hybrid xerogels of microporous nature to evaluate their adsorption properties for the following molecular separations: carbon dioxide / methane; ethane/ethylene; and hexane isomers. For the carbon dioxide / methane system a microporous silica xerogel synthesized at pH 2.5 showed the most favourable results, adsorbing 1.8 mmol/g of CO2. In the case of the ethane/ethylene system it was possible to obtain materials with reverse selectivity, that is, while silica xerogels adsorbed preferentially ethylene, some hybrid xerogels adsorbed preferentially ethane. Considering the adsorption of hexane isomers (n-hexane, 3-methyl pentane and 2,2-dimethylbutane), both silica and hybrid xerogels, but particularly the latter, were able to differentiate between the adsorption of the mono and the di-branched isomers.
DOI http://dx.doi.org/10.1016/j.colsurfa.2018.10.063
ISBN
Publisher
Book Title
ISSN 0927-7757
EISSN 1873-4359
Conference Name
Bibtex ID ISI:000451433600015
Observations
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