|Author||Hall, W. Keith ♦ Wallace, W. E. ♦ Cheselske, F. J.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||ATOMIC AND MOLECULAR PHYSICS ♦ ACTIVATION ANALYSIS ♦ CATALYSIS ♦ DESORPTION ♦ DEUTERIUM ♦ ENERGY ♦ GASES ♦ HYDROGEN ♦ ISOTOPIC EXCHANGE ♦ MOLECULES ♦ PRESSURE ♦ REACTION KINETICS ♦ SOLIDS ♦ SOLUBILITY ♦ SURFACES ♦ TANTALUM HYDRIDES ♦ TRANSPORT THEORY|
|Abstract||The rate of the transport of hydrogen from solid tantalum hydride to gas was found to be proportional to pressure while the solubility of hydrogen in tantalum varies as the square root of pressure. These facts, together with the previously determined activation energy (14.9 0.5 kcal/ mole) and the absolute magnitude of the rate, can be satisfactorily rationalized if it is assumed that the rate-determining step involves desorption of hydrogen molecules from the surface. When deuterium is present, this corresponds to a Bonhoeffer-- Farkas-type mechanism for the exchange reaction. A Rideal-type mechanism, involving an exchange between a molecule and an adsorbed atom, would appear to be ruled out on the grounds that the observed pressure dependence would require that the surface be nearly completely covered with adsorbed hydrogen atoms; evidence has been obtained indicating that this probably is not the case.|
|Learning Resource Type||Article|
|Publisher Department||Mellon Inst., Pittsburgh|
|Journal||Journal of Physical Chemistry|
|Organization||Mellon Inst., Pittsburgh|
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