Cu/SBA-15 as adsorbent for propane/propylene separation |
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Authors: | E I Basaldella JC Tara G Aguilar Armenta M E Patiño Iglesias |
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Affiliation: | (1) Centro de Investigación y Desarrollo en Ciencias Aplicadas Dr Jorge J. Ronco, CINDECA (CONICET-CIC-UNLP), 47 No. 257 La Plata, Argentina;(2) Centro de Investigación, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Puebla, México |
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Abstract: | Samples of mesoporous silica SBA-15 were prepared under hydrothermal conditions where Cu cations were incorporated to the
structure by impregnation in order to compare the adsorption behavior in the presence and absence of this element. The adsorption/desorption
equilibrium isotherms of propylene, propane, and N2 were measured to evaluate their usefulness in the propane/propylene separation.
All the adsorption isotherms of SBA-15 measured in the absence of Cu cations were described by the Freundlich equation, while
the adsorption isotherms of propane on Cu/SBA-15 were better represented by the Henry equation and those of propylene were
satisfactorily described by the Langmuir model in the range P < 100 Torr. The adsorption uptake of propylene increased and that of propane decreased in Cu/SBA-15 as compared to the amounts
observed in the SBA-15 sample. The presence of Cu atoms in the adsorbent lattice increased the selectivity towards propylene.
Under some working conditions the adsorbed amount of propylene in Cu/SBA-15 sample was totally reversible and the propane
uptake, negligible. |
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Keywords: | Adsorption Mesoporous materials SBA-15 |
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