CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL

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Description

The objective of this project is to develop ceramic membranes for hydrogen separation from fuel gas or synthesis gas at temperatures 400-500 C. The membrane chosen for this purpose consists of a dense silica layer coated on a porous support by chemical vapor depositrion (CVD). The support used during the reporting period was zeolite silicalite grown on macroporous alumina tubes. Chemical vapor deposition was carried out using alternating exposure of the support to silicon tetrachloride (SiCl{sub 4}) and water vapor at 400-500 C. Under these conditions it takes about twenty-five reaction cycles to narrow down the pores of the zeolite ... continued below

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16 pages

Creation Information

Gavalas, George R. March 18, 2003.

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Description

The objective of this project is to develop ceramic membranes for hydrogen separation from fuel gas or synthesis gas at temperatures 400-500 C. The membrane chosen for this purpose consists of a dense silica layer coated on a porous support by chemical vapor depositrion (CVD). The support used during the reporting period was zeolite silicalite grown on macroporous alumina tubes. Chemical vapor deposition was carried out using alternating exposure of the support to silicon tetrachloride (SiCl{sub 4}) and water vapor at 400-500 C. Under these conditions it takes about twenty-five reaction cycles to narrow down the pores of the zeolite support sufficiently for separation of hydrogen from other gases. The membranes were characterized by gas adsorption for pore size distribution, scanning electron microscopy, and EDAX for elemental composition. The permeance of H{sub 2}, N{sub 2}, CO{sub 2}, n-C{sub 4}H{sub 10}, and i-C{sub 4}H{sub 10} was measured in the temperature range 100-250 C. At 150 C, the H{sub 2}:N{sub 2} permeance ratio was in the range 100-200 at a hydrogen permeance of 5-10x10{sup -8} mol/m{sub 2}-s-Pa.

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16 pages

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OSTI as DE00812539

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  • Other Information: PBD: 18 Mar 2003

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  • Report No.: NONE
  • Grant Number: FG26-00NT40817
  • DOI: 10.2172/812539 | External Link
  • Office of Scientific & Technical Information Report Number: 812539
  • Archival Resource Key: ark:/67531/metadc737291

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  • March 18, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 3, 2017, 6:25 p.m.

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Gavalas, George R. CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL, report, March 18, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc737291/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.