Diffusion of linear paraffins in nanoporous silica

Qiao, S. Z. ; Bhatia, S. K. (2005) Diffusion of linear paraffins in nanoporous silica Industrial & Engineering Chemistry Research, 44 (16). pp. 6477-6484. ISSN 0888-5885

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ie048931x

Related URL: http://dx.doi.org/10.1021/ie048931x


The diffusion of hexane, heptane, octane, and decane in nanoporous MCM-41 silica at various temperatures is investigated by the zero-length-column method. The diffusion coefficients are derived by a complete-time-range analysis of desorption curves at different purge flow rates and temperatures. The results show that the calculated low-coverage diffusivity values decrease monotonically, and the derived Henry's law constants increase, as the carbon number of paraffins increases. The study reveals that transport is strongly influenced by intracrystalline diffusion and dominated by the sorbate-sorbent interaction. The diffusion activation energy and adsorption isosteric heat at zero loading increase monotonically with the carbon number of linear paraffins, but their ratio is essentially constant for each adsorbate compound.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:2790
Deposited On:08 Oct 2010 11:28
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