Para-to-Ortho H2 Conversion on Gd, Y, Gd2O3, and Y2O3 |
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| Authors: | D R ROSSINGTON V F CAPOZZI |
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| Affiliation: | New York State College of Ceramics at Alfred University, Alfred, New York 14802 |
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| Abstract: | The mechanism of parahydrogen conversion was studied on Gd2O3 and Y2O3 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 Gd2O3, Gd, and Y. On Y2O3 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. |
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