Kinetics of the bimolecular reaction NO+H2 on Pt

Article abstract of DOI:10.1016/0304-5102(93)85060-7

The reaction of NO+H₂ on polycrystalline wires and foils is studied from temperatures between 550 and 1800 K, and partial pressures between 10^-3 and 1 Torr. N₂ and N₂O are the main products formed during this reaction. Below about 750 K and above 1500 K, the rates of N₂ and N₂O formation are about equal. Both rates go through a maximum, then a minimum and rise again with increasing temperature above 1500 K and 1200 K respectively. Rate data for the formation of N₂ and N₂O at low, intermediate and high temperature regimes are fitted with Langmuir-Hinshelwood (LH) bimolecular rate expressions within about ±30%. Heats of adsorption for NO and H₂, obtained from these rate expressions are 25.3 and 12.4 kcal/mol respectively.