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Title: CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL

Abstract

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.

Authors:
Publication Date:
Research Org.:
California Institute of Technology (US)
Sponsoring Org.:
(US)
OSTI Identifier:
812539
DOE Contract Number:  
FG26-00NT40817
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 18 Mar 2003
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 01 COAL, LIGNITE, AND PEAT; 36 MATERIALS SCIENCE; ADSORPTION; CERAMICS; CHEMICAL VAPOR DEPOSITION; COAL; FUEL GAS; GASES; HYDROGEN; HYDROGEN PRODUCTION; MEMBRANES; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON; SYNTHESIS GAS; WATER VAPOR; ZEOLITES

Citation Formats

Gavalas, George R. CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL. United States: N. p., 2003. Web. doi:10.2172/812539.
Gavalas, George R. CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL. United States. doi:10.2172/812539.
Gavalas, George R. Tue . "CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL". United States. doi:10.2172/812539. https://www.osti.gov/servlets/purl/812539.
@article{osti_812539,
title = {CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL},
author = {Gavalas, George R},
abstractNote = {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.},
doi = {10.2172/812539},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {3}
}