Report

High-Selectivity, High-Flux Silica Membranes for Gas Separation

See allHide authors and affiliations

Science  13 Mar 1998:
Vol. 279, Issue 5357, pp. 1710-1711
DOI: 10.1126/science.279.5357.1710

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Abstract

Process improvements in silica membrane fabrication, especially the use of clean-room techniques, resulted in silica membranes without detectable mesoscopic defects, resulting in significantly improved transport properties. Supported membranes calcined at 400°C were 30 nanometers in thickness, showed a H2 permeance at 200°C of 2 × 10−6 moles per square meter per second per Pascal (mol m−2 s−1 Pa−1), and had a CH4 permeance more than 500 times smaller. Molecules larger than CH4 were completely blocked. Silica membranes calcined at 600°C showed no detectable CH4 flux, with a H2 permeance of 5 × 10−7 (mol m−2 s−1 Pa−1) at 200°C. These results signify an important step toward the industrial application of these membranes such as purification of H2 and natural gas as well as the selective removal of CO2.

View Full Text