A study of 15N14N isotopic exchange over cobalt molybdenum nitrides

Hunter, S.M., Gregory, D.H. , Hargreaves, J.S.J. , Richard, M., Duprez, D. and Bion, N. (2013) A study of 15N14N isotopic exchange over cobalt molybdenum nitrides. ACS Catalysis, 3(8), pp. 1719-1725. (doi: 10.1021/cs400336z) (PMID:24265977) (PMCID:PMC3831547)

Abstract

The 14N/15N isotopic exchange pathways over Co3Mo3N, a material of interest as an ammonia synthesis catalyst and for the development of nitrogen transfer reactions, have been investigated. Both the homomolecular and heterolytic exchange processes have been studied, and it has been shown that lattice nitrogen species are exchangeable. The exchange behavior was found to be a strong function of pretreatment with ca. 25% of lattice N atoms being exchanged after 40 min at 600 °C after N2 pretreatment at 700 °C compared to only 6% following similar Ar pretreatment. This observation, for which the potential contribution of adsorbed N species can be discounted, is significant in terms of the application of this material. In the case of the Co6Mo6N phase, regeneration to Co3Mo3N under 15N2 at 600 °C occurs concurrently with 14N15N formation. These observations demonstrate the reactivity of nitrogen in the Co–Mo–N system to be a strong function of pretreatment and worthy of further consideration.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hargreaves, Professor Justin and Gregory, Professor Duncan
• Authors: Hunter, S.M., Gregory, D.H., Hargreaves, J.S.J., Richard, M., Duprez, D., and Bion, N.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: ACS Catalysis
• Publisher: American Chemical Society
• ISSN: 2155-5435
• ISSN (Online): 2155-5435
• Copyright Holders: Copyright © 2013 American Chemical Society
• First Published: First published in ACS Catalysis 3(8):1719-1725
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher