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

K. McAulay; J.S.J. Hargreaves; A.R. McFarlane; D.J. Price; N.A. Spencer; N. Bion; F. Can; M. Richard; H.F. Greer; W.Z. Zhou

doi:10.1016/j.catcom.2015.04.016

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

K. McAulay, J.S.J. Hargreaves, A.R. McFarlane, D.J. Price, N.A. Spencer, N. Bion, F. Can, M. Richard, H.F. Greer, W.Z. Zhou

Research output: Contribution to journal › Article › peer-review

Abstract

Abstract 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 providing indirect evidence for formation of an active nitride phase. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed isotopic exchange experiments where H₂:Ar treated material is inactive and its H₂:N₂ treated counterpart active.

Original language	English
Pages (from-to)	53-57
Journal	Catalysis Communications
Volume	68
Early online date	12 Apr 2015
DOIs	https://doi.org/10.1016/j.catcom.2015.04.016
Publication status	Published - 5 Aug 2015

Keywords

Ammonia
Cobalt
Rhenium
Nitrite
Hydrogen

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Greer_2015_CC_Influence_CC
Copyright 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Final published version, 1.34 MBLicence: CC BY

Cite this

@article{694a8a055062467587f8fdb070f11365,

title = "The influence of pre-treatment gas mixture upon the ammonia synthesis activity of Co-Re catalysts",

abstract = "Abstract 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 providing indirect evidence for formation of an active nitride phase. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed isotopic exchange experiments where H2:Ar treated material is inactive and its H2:N2 treated counterpart active.",

keywords = "Ammonia, Cobalt, Rhenium, Nitrite, Hydrogen",

author = "K. McAulay and J.S.J. Hargreaves and A.R. McFarlane and D.J. Price and N.A. Spencer and N. Bion and F. Can and M. Richard and H.F. Greer and W.Z. Zhou",

note = "KMcA and JSJH would like to thank the EPSRC and the School of Chemistry, University of Glasgow for the provision of a DTA Studentship to KM. ARMcF and JSJH gratefully acknowledge the EPSRC for funding through project EP/J018384/1. ",

year = "2015",

month = aug,

day = "5",

doi = "10.1016/j.catcom.2015.04.016",

language = "English",

volume = "68",

pages = "53--57",

journal = "Catalysis Communications",

issn = "1566-7367",

publisher = "Elsevier",

}

TY - JOUR

T1 - The influence of pre-treatment gas mixture upon the ammonia synthesis activity of Co-Re catalysts

AU - McAulay, K.

AU - Hargreaves, J.S.J.

AU - McFarlane, A.R.

AU - Price, D.J.

AU - Spencer, N.A.

AU - Bion, N.

AU - Can, F.

AU - Richard, M.

AU - Greer, H.F.

AU - Zhou, W.Z.

N1 - KMcA and JSJH would like to thank the EPSRC and the School of Chemistry, University of Glasgow for the provision of a DTA Studentship to KM. ARMcF and JSJH gratefully acknowledge the EPSRC for funding through project EP/J018384/1.

PY - 2015/8/5

Y1 - 2015/8/5

N2 - Abstract 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 providing indirect evidence for formation of an active nitride phase. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed isotopic exchange experiments where H2:Ar treated material is inactive and its H2:N2 treated counterpart active.

AB - Abstract 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 providing indirect evidence for formation of an active nitride phase. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed isotopic exchange experiments where H2:Ar treated material is inactive and its H2:N2 treated counterpart active.

KW - Ammonia

KW - Cobalt

KW - Rhenium

KW - Nitrite

KW - Hydrogen

U2 - 10.1016/j.catcom.2015.04.016

DO - 10.1016/j.catcom.2015.04.016

M3 - Article

SN - 1566-7367

VL - 68

SP - 53

EP - 57

JO - Catalysis Communications

JF - Catalysis Communications

ER -

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

Abstract

Keywords

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