Use of silica sols in inorganic molecular sieving membranes

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Polymeric silica sols, were deposited on commercial {gamma}-alumina supports to prepare gas separation membranes. Optimization of the sol fractal dimension and radius of gyration and minimization of condensation rate led to formation of a discrete film with pores of molecular dimensions. Two coatings of this sol (A2{sup **}) led to a membrane with ideal separation factor of 7 for helium versus nitrogen after calcination to 400C (helium permeance 0.002 cm{sup 3}/cm{sup 2}-s-cm Hg). Partial sintering of these membranes resulted in a further reduction in pore size or narrowing of pore size distribution as evidenced by larger separation factors e.g. 9 ... continued below

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10 p.

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Sehgal, R.; Brinker, C.J. & Huling, J.C. July 1, 1995.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Polymeric silica sols, were deposited on commercial {gamma}-alumina supports to prepare gas separation membranes. Optimization of the sol fractal dimension and radius of gyration and minimization of condensation rate led to formation of a discrete film with pores of molecular dimensions. Two coatings of this sol (A2{sup **}) led to a membrane with ideal separation factor of 7 for helium versus nitrogen after calcination to 400C (helium permeance 0.002 cm{sup 3}/cm{sup 2}-s-cm Hg). Partial sintering of these membranes resulted in a further reduction in pore size or narrowing of pore size distribution as evidenced by larger separation factors e.g. 9 for helium versus nitrogen (helium permeance 0.0028 cm{sup 3}/cm{sup 2}-s-cm Hg) with only one A2{sup **} coating. Single gas measurements also showed high ideal separation factors for helium versus methane, propylene, sulfur hexafluoride and carbon dioxide. The deposited A2{sup **} membrane was reacted with titanium isopropoxide (Ti(O i-Pr){sub 4}) to improve both its thermal and chemical stability and modify its pore size. This reaction led to an increase in the membrane selectivity to >300 for He versus N{sub 2} below to 120C, and CO{sub 2} versus CH{sub 4}, when measured below 200C. A2{sup **} was also used as a host matrix for preparing imogolite composite membranes that showed molecular sieving behavior.

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10 p.

Notes

OSTI as DE95014885

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  • 3. international conference on inorganic membranes, Worcester, MA (United States), 10-14 Jul 1994

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  • Other: DE95014885
  • Report No.: SAND--95-1355C
  • Report No.: CONF-940713--4
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 101225
  • Archival Resource Key: ark:/67531/metadc619665

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Aug. 25, 2016, 2:45 p.m.

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Sehgal, R.; Brinker, C.J. & Huling, J.C. Use of silica sols in inorganic molecular sieving membranes, article, July 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc619665/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.