Tamaru's model for ammonia decomposition over titanium oxynitride

Titanium oxynitride TiNxOy was prepared by reaction of titania with flowing ammonia between 890 and 1120 K. Optimized operating conditions led to specific surface areas ranging from 58 to 87 m2 g−1. Kinetics of catalytic ammonia decomposition at 900 K showed that titanium oxynitrides presented a tungsten (or iron)-type behaviour at low hydrogen pressure and a Temkin–Pyzhev behaviour characteristic of platinum, at higher hydrogen pressures. These two behaviours enter the general model of Tamaru for ammonia decomposition.