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The kinetics of the reactions involving the formation of N_2O in the catalytic oxidationof NH_3 have been studied over polycrystalline Pt-10% Rh filament in a static system,using a Fou-rier transform infrared spectrometer to monitor the partial pressures of NH_3 and N_2O.The soleformation of N_2O proceeds over the filament temperatures range of 250～350℃.The reaction rateis of first order in NH_3 pressure and half order in O_2 pressure,and the rate equation can be writtenas v=k_(app)·P_(NH_3)·P_(O_2)~(1/2).The apparent activation energy of the N_2O formation reaction fromthe temperature coefficient of the rate constants is found to be 25 kcal/mol.The interpretation ofthese results in terms of Eley-Rideal type mechanism has been presented.The rate-controllingstep might be the reaction between gaseous ammonia molecules and the chemisorped oxygen atomson the surface.
The kinetics of the reactions involving the formation of N_2O in the catalytic oxidation of NH_3 have been studied over polycrystalline Pt-10 system. Using a Fou-rier transform infrared spectrometer to monitor the partial pressures of NH_3 and N_2O.The the reaction rate of the first order in NH 3 pressure and the half order in O 2 pressure, and the rate equation can be written as v = k app app. P_ (NH_3). P_ (O_2) ~ (1/2). The apparent activation energy of the N_2O formation reaction from the temperature coefficient of the rate constants is found to be 25 kcal / mol. The interpretation of the results in terms of Eley-Rideal type mechanism has been The rate-controllingstep might be the reaction between gaseous ammonia molecules and the chemisorped oxygen atomson the surface.