Abstract
Titanium oxynitride TiN x O y 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 m 2 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.
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