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Para‐to‐Ortho H 2 Conversion on Gd, Y, Gd 2 O 3 , and Y 2 O 3
Author(s) -
ROSSINGTON D. R.,
CAPOZZI V. F.
Publication year - 1974
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1974.tb11394.x
Subject(s) - paramagnetism , metal , spin isomers of hydrogen , gadolinium , chemistry , reaction mechanism , materials science , analytical chemistry (journal) , hydrogen , catalysis , metallurgy , condensed matter physics , biochemistry , physics , organic chemistry , chromatography
The mechanism of parahydrogen conversion was studied on Gd 2 O 3 and Y 2 O 3 powders and on Gd and Y evaporated metal films at low and high temperatures (77° to 90°K and 298° to 418°K). Absolute rates of conversion are compared to theoretical values for 3 possible reaction mechanisms, and it is concluded that a paramagnetic vibrational mechanism is operative on Gd 2 O 3 , Gd, and Y. On Y 2 O 3 the reaction rate is enhanced by additional surface paramagnetic sites. The portion of the surface which is active is ∼1 for the metals and ∼0.01 for the oxides.