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The role of composition for cobalt molybdenum carbide in ammonia synthesis

The role of composition for cobalt molybdenum carbide in ammonia synthesis
The role of composition for cobalt molybdenum carbide in ammonia synthesis
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 toward 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.
Ammonia synthesis, Co3Mo3C, Co3Mo3N, In situ neutron diffraction, Mars-van Krevelen
9214-9222
Al Shibane, Ihfaf
22653f81-49c2-44e2-ab9d-9acfa1fea095
Daisley, Angela
88540ea0-e9a9-4757-a77d-40e219985875
Hargreaves, Justin S.J.
d95754e7-6e2d-4c98-b151-b6b73b0f8024
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Laassiri, Said
ee91bba8-bbb2-4460-b515-bd1833ccfad0
Rico, Jose L.
ae90db06-f78f-457b-9d48-7f7492f05512
Smith, Ronald I.
a48f18fe-2e34-4575-95b6-994e50ad3f50
Al Shibane, Ihfaf
22653f81-49c2-44e2-ab9d-9acfa1fea095
Daisley, Angela
88540ea0-e9a9-4757-a77d-40e219985875
Hargreaves, Justin S.J.
d95754e7-6e2d-4c98-b151-b6b73b0f8024
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Laassiri, Said
ee91bba8-bbb2-4460-b515-bd1833ccfad0
Rico, Jose L.
ae90db06-f78f-457b-9d48-7f7492f05512
Smith, Ronald I.
a48f18fe-2e34-4575-95b6-994e50ad3f50

Al Shibane, Ihfaf, Daisley, Angela, Hargreaves, Justin S.J., Hector, Andrew L., Laassiri, Said, Rico, Jose L. and Smith, Ronald I. (2017) The role of composition for cobalt molybdenum carbide in ammonia synthesis. ACS Sustainable Chemistry & Engineering, 5 (10), 9214-9222. (doi:10.1021/acssuschemeng.7b02168).

Record type: Article

Abstract

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 toward 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.

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Accepted/In Press date: 23 August 2017
e-pub ahead of print date: 23 August 2017
Published date: 23 August 2017
Keywords: Ammonia synthesis, Co3Mo3C, Co3Mo3N, In situ neutron diffraction, Mars-van Krevelen

Identifiers

Local EPrints ID: 416042
URI: https://eprints.soton.ac.uk/id/eprint/416042
PURE UUID: fb901af5-6acf-48a9-8784-1cc5208319f0
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

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Date deposited: 30 Nov 2017 17:30
Last modified: 15 Aug 2019 00:53

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