Abstract
A hydrothermally stable hydrogen-selective membrane was prepared by multi-component chemical vapor deposition (CVD) of a thin silica-alumina layer on a porous g-alumina support in an inert atmosphere. This process placed a silica-alumina layer on the surface of the substrate by thermal decomposition of tetraethylorthosilicate (TEOS) and alumina-tri-sec-butoxide (ATSB) at high temperatureThe resulting composite membrane was selective for H2, He, D2 and Ne over CO, CO2 and CH4. The permeation of small gaseous species (He > H2 > D2 > Ne) did not follow mass or size of the permeating species. This unusual order of permeation was explained by a mechanism involving hopping of the gaseous species between adjacent solubility sites. The geometries of the ring clusters were obtained by energy minimization of the structures using a density functional theory (DFT) method in Gaussian 98.
Original language | English |
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Journal | ACS National Meeting Book of Abstracts |
State | Published - 2010 |
Event | 239th ACS National Meeting and Exposition - San Francisco, CA, United States Duration: 21 Mar 2010 → 25 Mar 2010 |