Ceramic membrane reactor for synthesis gas production

Membrane reactors enable synthesis‐gas production from methane and air while avoiding the need for separation of the nitrogen either before or after the reaction. A stable membrane was developed by spray deposition of a dense thin film of La0.5Sr0.5Fe0.8Ga0.2O3 − δ on a high‐purity porous α‐alumina...

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Bibliographic Details
Published in:AIChE journal 2001-09, Vol.47 (9), p.2092-2101
Main Authors: Ritchie, J. T., Richardson, J. T., Luss, Dan
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Chemistry
Colloidal state and disperse state
Energy
Exact sciences and technology
Fuel processing. Carbochemistry and petrochemistry
Fuels
Gas processing
General and physical chemistry
Membranes
Reactors
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Summary:Membrane reactors enable synthesis‐gas production from methane and air while avoiding the need for separation of the nitrogen either before or after the reaction. A stable membrane was developed by spray deposition of a dense thin film of La0.5Sr0.5Fe0.8Ga0.2O3 − δ on a high‐purity porous α‐alumina tube. The oxygen permeation rate at 850°C was 2.5 × 10−7 mol·cm−2·s−1. A quartz tube was placed coaxially around the membrane and the shell filled with a rhodium catalyst. Air was fed to the tube and methane to the shell. At 850°C the methane conversion was 97% and the selectivity to carbon monoxide approached 100%. Rapid radial mixing of the oxygen in the shell is essential to prevent coking and undesirable reactions. The membrane decomposes at 780°C in pure CH4, but remains stable up to 970°C in a mixture of 90‐mol % CH4 and 10‐mol % CO2.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690470919