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Theoretical study of the design of a catalyst for para to ortho hydrogen conversionThe theory of Petzinger and Scalapino (1973) was thoroughly reviewed, and all of the basic equations for paramagnetic para to ortho hydrogen catalysis re-derived. There are only a few minor phase errors and errors of omission in the description of the theory. Three models (described by Petzinger and Scalapino) for the rate of para to ortho H2 catalysis were worked out, and uniform agreement obtained to within a constant factor of 2 pi. The analytical methods developed in the course of this study were then extended to two new models, which more adequately describe the process of surface catalysis including transfer of hydrogen molecules onto and off of the surface. All five equations for the para to ortho catalytic rate of conversion are described. The two new equations describe the catalytic rate for these models: H2 on the surface is a 2-D gas with lifetime tau; and H2 on the surface is a 2-D liquid undergoing Brownian motion (diffusion) with surface lifetime tau.
Document ID
19920011282
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Coffman, Robert E. (Iowa Univ. Iowa City, IA, United States)
Date Acquired
September 6, 2013
Publication Date
March 25, 1992
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-CR-190163
NAS 1.26:190163
Accession Number
92N20524
Funding Number(s)
CONTRACT_GRANT: NAG3-1056
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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