Document Detail


Microporous niobia-silica membrane with very low CO2 permeability.
MedLine Citation:
PMID:  18702139     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A sol-gel-derived microporous ceramic membrane with an exceptionally low permeability for CO(2) from gaseous streams was developed and characterized. The sols were prepared from a mixture of niobium and silicon alkoxide precursors by acid-catalyzed synthesis. Microporous films were formed by coating asymmetric gamma-alumina disks with the polymeric sol (Si/Nb=3:1), followed by calcination at 500 degrees C. The membrane consists of a 150-nm-thick layer with a Si/Nb atomic ratio of about 1.5. The single-gas permeance of small gas molecules such as H(2), CH(4), N(2), and SF(6) decreases steadily with kinetic diameter. Hydrogen, helium, and carbon dioxide follow an activated transport mechanism through the membrane. The permeance of CO(2) in this membrane is much lower than that in pure silica, and its behavior deviates strongly from the general trend observed with the other gases. This is attributed to a relatively strong interaction between CO(2) and adsorption sites in the niobia-silica membrane.
Authors:
Vittorio Boffa; Johan E ten Elshof; Andrei V Petukhov; Dave H A Blank
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  ChemSusChem     Volume:  1     ISSN:  1864-564X     ISO Abbreviation:  -     Publication Date:  2008  
Date Detail:
Created Date:  2008-08-14     Completed Date:  2009-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101319536     Medline TA:  ChemSusChem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  437-43     Citation Subset:  IM    
Affiliation:
MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Carbon Dioxide / chemistry*
Microscopy, Electron, Scanning
Niobium / chemistry*
Porosity
Silicates / chemistry*
Silicon Dioxide / chemistry*
Spectroscopy, Fourier Transform Infrared
Stereoisomerism
Temperature
Chemical
Reg. No./Substance:
0/Silicates; 124-38-9/Carbon Dioxide; 7440-03-1/Niobium; 7631-86-9/Silicon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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