Citrate-gel preparation and ammonia synthesis activity of compounds in the quaternary (Ni,M)2Mo3N (M = Cu or Fe) systems

Al Sobhi, S., Hargreaves, J. S.J. , Hector, A. L. and Laassiri, S. (2019) Citrate-gel preparation and ammonia synthesis activity of compounds in the quaternary (Ni,M)2Mo3N (M = Cu or Fe) systems. Dalton Transactions, 48(44), pp. 16786-16792. (doi:10.1039/C9DT03673C) (PMID:31681936)

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Abstract

Single phase solid solutions based on copper and iron substitution into the nickel sites of Ni2Mo3N are produced using a citrate gel approach followed by ammonolysis. These metal nitrides show good ammonia synthesis activity at 500 °C and ambient pressure. The activity fell with copper content and increased with iron content, although these changes appear to be related to the surface areas of the catalysts. The oxide intermediates from the citrate gel process cleanly converted to the metal nitride under the ammonia synthesis gas stream (75% H2, 25% N2) providing more active catalysts than those pre-nitrided by ammonolysis.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Laassiri, Dr Said and Hargreaves, Professor Justin
Authors: Al Sobhi, S., Hargreaves, J. S.J., Hector, A. L., and Laassiri, S.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Dalton Transactions
Publisher:Royal Society of Chemistry
ISSN:1477-9226
ISSN (Online):1477-9234
Published Online:25 October 2019

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
170245First principles design of novel ammonia synthesis catalystsJustin HargreavesEngineering and Physical Sciences Research Council (EPSRC)EP/L02537X/1Chemistry