Comparative investigation on the correction factors of hydrogen permeability on CNTs-Mixed matrix membrane

International Journal of Nano Dimension

مقاله 2، دوره 2، شماره 4، شهریور 2012، صفحه 217-221   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.7508/ijnd.2011.04.001

نویسندگان

A. Solaymani¹؛ M. M. Doroodmand²؛ S. Sabbaghi^{* 1}

¹Department of Nano Chemical Engineering, Shiraz University, Shiraz, Iran.

²Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran.

چکیده

This paper discusses different important gas permeation models such as “Maxwell”, “Bruggeman”, “Lewis-Neilson”, and “Pal” models to predict “Mixed Matrix Membranes” (MMMs) performance. The main parameter considered and discussed is the permeability of Hydrogen on Carbon Nanotubes (CNTs)-MMM. For evaluation of the theoretical models, experimental data of permeability for H₂ were compared to the theoretical models. The results revealed that, the existing models are not appropriate for evaluation of the permeability of the carbon nanostructure-based MMMs. Therefore, correction factors are needed to fit the selective permeability of carbon nanostructure-based MMMs for selective separation of various gaseous such as H₂ or CO₂. This correction factor robustly depends on the morphology of carbon nanostructures, the defect, kind and amount of metal/metal oxide nanoparticles, doped on carbon substrate and functional groups in the carbon matrix. Hence, to be in a good agreement with experimental data for separation of H₂ from CO₂, the correction value was estimated to -0.0022 for single-walled carbon nanotubes (SWCNTs), -0.0032 for pure multi-walled carbon nanotubes (MWCNTs), -0.0044 for carbon nanofibers (CNFs).

کلیدواژه‌ها

Mixed Matrix Membrane؛ Permeation model؛ Gas separation؛ Permeability