Abstract
In the H2/O2 reaction, the desorption of OH from a polycrystalline palladium foil has been studied with Laser-Induced Fluorescence (LIF) as a function of the hydrogen mixing ratio, αH2, and the temperature. The water production as a function of αH2 was also monitored with microcalorimetry. The apparent desorption energy, EOH a, for OH has been measured from αH2 = 0% to αH2 = 74%. At αH2 = 0%, EOH a was measured to be 143 ± 7 kJ/mol; the apparent desorption energy then increases linearly with αH2 to a maximum value of 223 ± 6 kJ/mol at αH2 = 40%. At higher αH2, the apparent desorption energy was measured to be constant at about 200 kJ/mol. The maximum in apparent desorption energy at αH2=40% occurs at the same αH2 as the maximum in water production. This phenomenon has also been reported for the platinum metal, although at an αH2 value of 20%. The relative coverage of intermediates and products on the palladium catalysts was obtained using Chemkin.
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