Reaction kinetics and product selectivity in the oxidation of methane over Pd/Si3N4

Kinetic measurements on the oxidation of methane over Pd/Si 3 N 4 under fuel-rich conditions at high temperatures show that, unlike what is usually reported for fuel-lean conditions, methane oxidation is zero order in methane and positive order in oxygen. CO is a primary product at high temperature and high CH 4 /O 2 ratios, when the surface is covered by carbon rather than by oxygen adspecies.