The influence of pre-treatment gas mixture upon the ammonia synthesis activity of Co–Re catalysts

CoRe4 catalysts highly active for ammonia synthesis at ambient pressure and 400°C can be prepared without an ammonolysis stage. Pre-treatments under 3:1 H2:N2 and 3:1 H2:Ar atmospheres are shown to influence catalytic performance with the latter treatment leading to an induction period prior to deve...

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Bibliographic Details
Published in:Catalysis communications 2015-08, Vol.68, p.53-57
Main Authors: McAulay, K., Hargreaves, J.S.J., McFarlane, A.R., Price, D.J., Spencer, N.A., Bion, N., Can, F., Richard, M., Greer, H.F., Zhou, W.Z.
Format: Article
Language:English
Subjects:
Ammonia
Catalysis
Chemical Sciences
Cobalt
Hydrogen
Nitride
Rhenium
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Summary:CoRe4 catalysts highly active for ammonia synthesis at ambient pressure and 400°C can be prepared without an ammonolysis stage. Pre-treatments under 3:1 H2:N2 and 3:1 H2:Ar atmospheres are shown to influence catalytic performance with the latter treatment leading to an induction period prior to development of activity upon switching to an ammonia synthesis feedstream. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed nitrogen isotopic exchange experiments where H2:Ar treated material is inactive and its H2:N2 treated counterpart is active. [Display omitted] •Co-Re ammonia synthesis catalysts can be formed by reduction with H2/N2.•In the case of H2/Ar reduction an induction period is evident.•H2/N2 reduced materials are active for homomolecular N2 exchange.•H2/Ar reduced materials are not active for homomolecular N2 exchange.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2015.04.016