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kinetic study of methyl acetate oxidation in a pt/al2o3 fixed-bed reactorTo support technology development for future long-term missions, a metabolic simulator will be used in a closed chamber to test the functions of a Controlled Ecological Life Support System (CELSS). Methyl acetate (MA) was selected as the fuel because its metabolic respiratory quotient is near that of humans. A kinetic study of the catalytic oxidation of MA over Pt/Al203 was then conducted to support the design and operation of the simulator. Kinetic data were obtained as a conversion percentage of MA versus retention time. The reaction was studied at one atmosphere and temperatures from 220 to 340 deg. C. The inlet MA concentration was varied from 100 to 2000 ppm with retention times from 0.01 to 10 sec. A first-order rate law and a Langmuir-Hinshelwood rate equation were tested by nonlinear regression of the kinetic data to estimate rate constants in the rate law. Regression results of the L-H equation explain the kinetic data better than the results of the first-order rate law. A Taguchi experimental design was used to study the effects of temperature, retention time, and concentrations of MA, CO2, and O2 on the conversion of MA. Results indicate that temperature has greatest effect, followed by retention time, and finally MA concentration. It was further determined that the effects of CO2 and O2 concentrations, and the cross effects, are negligible.
Document ID
19960021765
Document Type
Conference Paper
Authors
Hoy, Michael
(NASA Johnson Space Center Houston, TX United States)
Li, K. Y.
(Lamar Univ. Beaumont, TX United States)
Li, Jeffrey S.
(Lamar Univ. Beaumont, TX United States)
Chen, S. M.
(Lamar Univ. Beaumont, TX United States)
Yaws, C. L.
(Lamar Univ. Beaumont, TX United States)
Chu, H. W.
(Lamar Univ. Beaumont, TX United States)
Simon, W. E.
(Lamar Univ. Beaumont, TX United States)
Date Acquired
August 17, 2013
Publication Date
May 1, 1994
Publication Information
Publication: Dual-Use Space Technology Transfer Conference and Exhibition
Volume: 1
Subject Category
Man/System Technology and Life Support
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19960021743Analytic PrimaryDual-Use Space Technology Transfer Conference and Exhibition
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