Development and characterization of silica-based membranes for hydrogen separation (Journal article)

Nitodas, S.F.Favvas, E.P.Romanos, G.E.Papadopoulos, M.A.Mitropoulos, A.C.Kanellopoulos, N.K.


 Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7321
The method of chemical vapor deposition (CVD) in the counter current configuration was employed in the present study for the development of composite silica membranes. The experiments were carried out in a horizontal CVD reactor under controlled temperature conditions and at various reaction times and differential pressures across the substrate sides. Tetraethylorthosilicate (TEOS) and ozone were used as deposition precursors. Two types of substrates were employed: a porous Vycor tube and an alumina (γ-Al2O 3) nanofiltration (NF) tube. Measurements with a novel mercury intrusion technique showed that significant reduction of the initial pore size of the γ-Al2O3 substrates was achieved, which reached 76% in the cases of extended silica deposition. Additionally, by appropriately interpreting the Knudsen type O2 permeance results, acquired during the CVD treatment of Vycor tubes, a pore radius reduction even down to the 30% of the initial value was concluded. The permeance of Η2 and other gases (Ηe, Ν2, Αr, CO 2) on the developed membranes was measured in a home-made apparatus. The separation capability of the composite membranes was determined by calculating the selectivity of hydrogen over helium, nitrogen, argon and carbon dioxide. © 2007 Springer Science+Business Media, LLC.
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Subject classification: Chemical vapor deposition
Keywords: Al2O3;Chemical vapor eposition;Hydrogen;Membrane permeance;SiO2;Vycor
URI: http://hdl.handle.net/123456789/7321
Publisher: Δεν υπάρχει πληροφορία
Item type: journalArticle
General Description / Additional Comments: Volume 15 , Issue 5, pp. 551-557
http://www.scopus.com/inward/record.url?eid=2-s2.0-51549110353&partnerID=40&md5=3aadc2662a9b04366b15b8bba2a0741b
Department of Petroleum and Natural Gas Technology, Cavala Institute of Technology, P.O. Box 1194, Ag. Loukas, Cavala 6540, Greece
Institute of Physical Chemistry, NCSR Demokritos, P.O. Box 60228, Ag. Paraskevi, Attikis 15310, Greece
Subject classification: Chemical vapor deposition
???metadata.heal.dateAvailable???: 2015-11-30T17:36:41Z
Item language: en
Item access scheme: free
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Publication date: 2008
Bibliographic citation: Δεν υπάρχει πληροφορία
Abstract: The method of chemical vapor deposition (CVD) in the counter current configuration was employed in the present study for the development of composite silica membranes. The experiments were carried out in a horizontal CVD reactor under controlled temperature conditions and at various reaction times and differential pressures across the substrate sides. Tetraethylorthosilicate (TEOS) and ozone were used as deposition precursors. Two types of substrates were employed: a porous Vycor tube and an alumina (γ-Al2O 3) nanofiltration (NF) tube. Measurements with a novel mercury intrusion technique showed that significant reduction of the initial pore size of the γ-Al2O3 substrates was achieved, which reached 76% in the cases of extended silica deposition. Additionally, by appropriately interpreting the Knudsen type O2 permeance results, acquired during the CVD treatment of Vycor tubes, a pore radius reduction even down to the 30% of the initial value was concluded. The permeance of Η2 and other gases (Ηe, Ν2, Αr, CO 2) on the developed membranes was measured in a home-made apparatus. The separation capability of the composite membranes was determined by calculating the selectivity of hydrogen over helium, nitrogen, argon and carbon dioxide. © 2007 Springer Science+Business Media, LLC.
Publisher: Δεν υπάρχει πληροφορία
Journal name: Journal of Porous Materials
Journal type: peer-reviewed
Appears in Collections:ΑΡΘΡΑ-ΜΕΛΕΤΕΣ

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