Abstract
The reduction of NO by NH3 could be readily monitored over a 2-cm 2 area platinum foil in the temperature range of 450–560 K. The reaction is first order in NO and zero order in NH 3 partial pressures, and the rate is given by r NO = 5 x 107 [NO] exp(- E/RT) (mol/cm 2.s) with E = 113 ± 20 kJ/mol. Vanadium oxide forms three-dimensional islands on Pt with a stoichiometry near V 20 4 . Its presence does not alter the activation energy appreciably but reduces the rate by blocking the active platinum sites.
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