Abstract
Abstract Titanium oxynitrides TiN x O y were prepared by reaction of titania with gaseous ammonia between 890 and 1120 K. Optimized operating conditions yielded specific surface areas ranging from 58 to 87 m 2 .g −1 . A kinetics study of catalytic ammonia decomposition at 900 K showed that these oxynitrides presented a tungsten-type (or iron) behaviour at low hydrogen pressure and a Temkin-Pyzhev behaviour characteristic of platinum, at higher hydrogen pressures.
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