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Surface-catalyzed air oxidation of hydrazines: Environmental chamber studiesThe surface-catalyzed air oxidation reactions of fuel hydrazines were studied in a 6500-liter fluorocarbon-film chamber at 80 to 100 ppm concentrations. First-order rate constants for the reactions catalyzed by aluminum, water-damaged aluminum (Al/Al2O3), stainless steel 304L, galvanized steel and titanium plates with surface areas of 2 to 24 sq m were determined. With 23.8 sq m of Al/Al2O3 the surface-catalyzed air oxidation of hydrazine had a half-life of 2 hours, diimide (N2H2) was observed as an intermediate and traces of ammonia were present in the final product mixture. The Al/Al2O3 catalyzed oxidation of monomethylhydrazine yielded methyldiazine (HN = NCH3) as an intermediate and traces of methanol. Unsymmetrical dimethylhydrazine gave no detectable products. The relative reactivities of hydrazine, MMH and UDMH were 130 : 7.3 : 1.0, respectively. The rate constants for Al/Al2O3-catalyzed oxidation of hydrazine and MMH were proportional to the square of the surface area of the plates. Mechanisms for the surface-catalyzed oxidation of hydrazine and diimide and the formation of ammonia are proposed.
Document ID
19900001843
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kilduff, Jan E.
(White Sands Test Facility Las Cruces, NM., United States)
Davis, Dennis D.
(White Sands Test Facility Las Cruces, NM., United States)
Koontz, Steven L.
(NASA White Sands Test Facility NM., United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Hazardous Materials Technical Center, The Third Conference on the Environmental Chemistry of Hydrazine Fuels
Subject Category
Propellants And Fuels
Accession Number
90N11159
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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