The reaction of NO + H-2 on polycrystalline wires and foils is studied
from temperatures between 550 and 1800 K, and partial pressures betwe
en 10(-3) and 1 Torr. N2 and N2O are the main products formed during t
his 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 1
200 K respectively. Rate data for the formation of N2 and N2O at low,
intermediate and high temperature regimes are fitted with Langmuir-Hin
shelwood (LH) bimolecular rate expressions within about +/- 30%. Heats
of adsorption for NO and H-2, obtained from these rate expressions ar
e 25.3 and 12.4 kcal/mol respectively.