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The catalytic removal of ammonia and nitrogen oxides from spacecabin atmospheresInvestigations were made on methods for the removal of ammonia and to a lesser extent nitrogen oxides in low concentrations from air. The catalytic oxidation of ammonia was studied over a temperature range of 250 F to 600 F and a concentration range 20 ppm to 500 ppm. Of the catalysts studied, 0.5 percent ruthenium supported on alumina was found to be superior. This material is active at temperatures as low as 250 F and was found to produce much less nitrous oxide than the other two active catalysts, platinum on alumina and Hopcalite. A quantitative design model was developed which will permit the performance of an oxidizer to be calculated. The ruthenium was found to be relatively insensitive to low concentrations of water and to oxygen concentration between 21 percent and 100 percent. Hydrogen sulfide was found to be a poison when injected in relatively large quantities. The adsorption of ammonia by copper sulfate treated silica gel was investigated at temperatures of 72 F and 100 F. A quantitative model was developed for predicting adsorption bed behavior.
Document ID
19730009424
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gully, A. J. (Texas Technological Univ. Lubbock, TX, United States)
Graham, R. R. (Texas Technological Univ. Lubbock, TX, United States)
Halligan, J. E. (Texas Technological Univ. Lubbock, TX, United States)
Bentsen, P. C. (Texas Technological Univ. Lubbock, TX, United States)
Date Acquired
September 2, 2013
Publication Date
February 1, 1973
Publication Information
Publisher: NASA
Subject Category
Chemistry
Report/Patent Number
NASA-CR-2132
Accession Number
73N18151
Funding Number(s)
CONTRACT_GRANT: NAS1-9506
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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