The role of composition for cobalt molybdenum carbide in ammonia synthesis

AlShibane, I., Daisley, A., Hargreaves, J. S.J. , Hector, A. L., Laassiri, S., Rico, J. L. and Smith, R. I. (2017) The role of composition for cobalt molybdenum carbide in ammonia synthesis. ACS Sustainable Chemistry and Engineering, 5(10), pp. 9214-9222. (doi: 10.1021/acssuschemeng.7b02168)

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The performance of Co3Mo3N, Co3Mo3C and Co6Mo6C for ammonia synthesis has been compared. In contrast to Co3Mo3N which is active at 400°C, a reaction temperature of 500°C, which was preceded by an induction period, was necessary for the establishment of steady state activity for Co3Mo3C. Co6Mo6C was found to be inactive under the conditions tested. During the induction period, nitridation of the Co3Mo3C lattice was found to occur and this continued throughout the period of steady state reaction with the material transforming in composition towards Co3Mo3N. Taken together, these observations demonstrate that ammonia synthesis activity in ternary cobalt molybdenum systems is associated with the presence of N in the 16c Wyckoff lattice site.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Laassiri, Dr Said and Daisley, Miss Angela and Alshibane, Ihfaf and Hargreaves, Professor Justin and Rico Cerda, Dr Jose Luis
Authors: AlShibane, I., Daisley, A., Hargreaves, J. S.J., Hector, A. L., Laassiri, S., Rico, J. L., and Smith, R. I.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:ACS Sustainable Chemistry and Engineering
Publisher:American Chemical Society
ISSN (Online):2168-0485
Published Online:23 August 2017
Copyright Holders:Copyright © 2017 American Chemical Society
First Published:First published in ACS Sustainable Chemistry and Engineering 5(10):9214–9222
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
652781First principles design of novel ammonia synthesis catalystsJustin HargreavesEngineering and Physical Sciences Research Council (EPSRC)EP/L02537X/1CHEM - CHEMISTRY