New π-Complexation Adsorbents for Propane−Propylene Separation

New adsorbents were prepared and tested for the separation of propane−propylene mixtures by adsorption. The ordered mesoporous material SBA-15 was used as the starting material for silver-ion deposition for π-complexation with propylene. Two different loadings of silver were evaluated. Adsorption eq...

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Bibliographic Details
Published in:Langmuir 2004-06, Vol.20 (13), p.5291-5297
Main Authors: Grande, Carlos A, Araujo, José D. P, Cavenati, Simone, Firpo, Norberto, Basaldella, Elena, Rodrigues, Alírio E
Format: Article
Language:English
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Summary:New adsorbents were prepared and tested for the separation of propane−propylene mixtures by adsorption. The ordered mesoporous material SBA-15 was used as the starting material for silver-ion deposition for π-complexation with propylene. Two different loadings of silver were evaluated. Adsorption equilibrium and kinetic measurements of propane and propylene in the matrix (pure SBA-15) and the silver-modified adsorbents were performed at 323, 343, and 373 K. In this temperature range, the selectivity of propylene in one of the materials (Ag/SBA-15 = 0.5) is in the range 13−22 because the amount of propane adsorbed is very small, 0.095 mmol/g of propane versus 1.12 mmol/g of propylene at 100 kPa and 343 K. The diffusivity of both hydrocarbons is not seriously affected by the introduction of silver into the mesoporous structure.
ISSN:0743-7463
1520-5827
DOI:10.1021/la036400s