Inverse kinetic isotope effect of ammonia decomposition over Ru/CeO 2 using deuterated ammonia.

Takuya SuguroFuminao KishimotoSota KuramotoWilliam J MovickKazuhiro Takanabe

Published in: Chemical communications (Cambridge, England) (2024)

This study investigated the ammonia decomposition mechanism over Ru/CeO 2 . Isotopic tests using ND 3 revealed that the rate-determining step involves adsorbed nitrogen atoms on Ru. Moreover, an inverse kinetic isotope effect where ND 3 decomposition was faster than NH 3 was clearly observed. The origin of the inverse effect was explained by the lower D coverage on the catalyst surface compared to H coverage for mitigating the inhibition of ND 3 activation.

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