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Gas Transport Mechanisms Through Sol–gel Derived Templated Membranes by G.D. West; G.G. Diamond; D. Holland; M.E. Smith; M.H. Lewis is a Engineering article available to read on EtoBox.

What is Gas Transport Mechanisms Through Sol–gel Derived Templated Membranes about?

Sol-gel polymerisation routes have been devised to produce microporous silica membranes for CO 2 /N 2 gas separation. The micropores are produced by the thermo-destruction of organic ligands (so-called templates) covalently attached to the silica network. The thermal stability and structural evolution with temperature of these materials has been characterised with TGA, differential thermal analysis (DTA), FTIR, 13 C CP MAS NMR and 29 Si MAS NMR investigations. The permeability of CO 2 , N 2 and He was measured through the membranes, as a function of pressure (front and back), temperature and time. CO 2 was found to permeate preferentially to He in optimum membranes despite its larger molecular diameter. Also, an inverse relationship was found between permeability and temperature. Together this provided strong evidence that gas transport is governed by surface diffusion. The permeability of N 2 and He was found to be invariant with time, whilst a characteristic permeability time curve was noticed for CO 2 (CO 2 permeability initially increased, before declining). The decrease in permeability has been attributed to CO 2 chemisorption, and is linked to the surface diffusion mechanism.

Who reads Gas Transport Mechanisms Through Sol–gel Derived Templated Membranes?

Author

G.D. West; G.G. Diamond; D. Holland; M.E. Smith; M.H. Lewis

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0376-7388)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)