Evaluation of hydrogen permselective separation from ""synthesis gas"" components based on single gas permeability measurements on anodic alumina membranes

Vaitsi, ST; Salmas, CE; Tsapekis, OG; Katsoulidis, AP; Androutsopoulos, GP

dc.contributor.author	Vaitsi, ST	en
dc.contributor.author	Salmas, CE	en
dc.contributor.author	Tsapekis, OG	en
dc.contributor.author	Katsoulidis, AP	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:35:39Z
dc.date.available	2014-03-01T01:35:39Z
dc.date.issued	2011	en
dc.identifier.issn	0378-3820	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21146
dc.subject	Anodic alumina	en
dc.subject	Gas permeance	en
dc.subject	Knudsen diffusion	en
dc.subject	Permeability	en
dc.subject	Permselectivity	en
dc.subject	Pore membrane	en
dc.subject.classification	Chemistry, Applied	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Anodic alumina	en
dc.subject.other	Gas permeance	en
dc.subject.other	Knudsen diffusion	en
dc.subject.other	Permselectivities	en
dc.subject.other	Pore membrane	en
dc.subject.other	Aluminum	en
dc.subject.other	Aluminum sheet	en
dc.subject.other	Anodic oxidation	en
dc.subject.other	Bioreactors	en
dc.subject.other	Carbon dioxide	en
dc.subject.other	Carbon monoxide	en
dc.subject.other	Gas permeability	en
dc.subject.other	Hydrothermal synthesis	en
dc.subject.other	Permselective membranes	en
dc.subject.other	Pore structure	en
dc.subject.other	Sorption	en
dc.subject.other	Synthesis gas	en
dc.subject.other	Gas permeable membranes	en
dc.title	Evaluation of hydrogen permselective separation from ""synthesis gas"" components based on single gas permeability measurements on anodic alumina membranes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.fuproc.2011.07.024	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.fuproc.2011.07.024	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Anodic alumina membranes were prepared by anodizing aluminum followed by chemical and hydrothermal treatments. Anodization was performed on both tube surfaces. External anodization was restricted to selected spots leaving an aluminum mechanically strong frame. Nitrogen sorption data analysed with the CPSM method (Corrugated Pore Structure Model) detected a mesopore structure (i.e. D-mean.,15-20) and surface areas of 2-20 m(2)/g. SEM microscopy images revealed a regular pore structure of independent pores with densities of N-pore similar to 5.6 x 10(14) pores/m(2). Single gas permeances (Pi) for X: H-2, CH4, CO and CO2 were measured on a Wicke-Kallenbach apparatus at varying mean transmembrane pressure P-m by the "dead-end" method. The observed slight dependence of Pi on P-m is indicative of strong Knudsen diffusion and weak viscous flow contributions. By correlating the experimental data with a linear Pi vs P-m relationship, Knudsen contribution evaluation was enabled, and found to vary in the range K-C approximate to 0.7-1.0. The Knudsen number criterion for flow regime discrimination is critically discussed and a realistic dual Knudsen number approach is proposed. Experimental permselectivities (alpha(H2X) = Pi(H2)/Pi(X) (X not equal H-2) approach by 70-100% their Knudsen selectivity counterparts. Anodic alumina membranes exhibit pore structure and gas permeability characteristics useful in designing integrated gas separation and catalytic membrane reactor systems. (C) 2011 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Fuel Processing Technology	en
dc.identifier.doi	10.1016/j.fuproc.2011.07.024	en
dc.identifier.isi	ISI:000297873500024	en
dc.identifier.volume	92	en
dc.identifier.issue	12	en
dc.identifier.spage	2375	en
dc.identifier.epage	2388	en