Gas Permeation Characteristics of Metal Doped Microporous Silica Membranes for CO2 Separation Prepared by Metal Salt-added Sol-gel Processing

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  • CO2分離のためのゾル－ゲル法による金属ドープ多孔性シリカ膜の 気体透過特性
  • CO2 ブンリ ノ タメ ノ ゾル ゲルホウ ニ ヨル キンゾク ドープ タコウセイ シリカ マク ノ キタイ トウカ トクセイ

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Abstract

Gas permeation properties through silica based metal-doped microporous membranes prepared by the sol-gel　method were investigated. In order to control pore size and affinity with permeating gas molecules, especially with　CO2 for CO2/N2 gas separation membranes, nitrates of Ni, Al, Mg metals, and ammonium salt of vanadium were　added to silica colloidal solutions. The molar ratio of additives, Si/M was 9/1. CO2 and N2 adsorption measurements　on pure silica and metal-doped silica powder samples were conducted to estimate the affinity of the membrane materials　with those gases. Pure silica and Ni-doped silica showed the largest amount of adsorbed CO2. Ni-doped silica　membranes showed no attract difference from a typical pure silica membrane for temperature dependencies of gas　permeance, while Mg-doped silica membranes might have relatively smaller effective pores for CO2/N2 separation　and the value of permeance ratio of 57 could be obtained at 50 ℃. On the other hand, V-doped silica membranes had　larger pores and N2 gas permeance increased with decreasing temperature, which would result in lower performance　of CO2 separation. Concerning the Al-doped silica membranes, the affinity with CO2 decreased by addition of Al. In　addition, activation energy of He and H2 for permeation on Al-doped membranes became greater, which suggested　densification of silica network because of Al dispersion in the dense phase.

Journal

  • MEMBRANE

    MEMBRANE 32 (1), 45-53, 2007

    THE MEMBRANE SOCIETY OF JAPAN

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