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The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N

The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N
The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N
The preparation route has been shown to have a significant influence upon the catalytic behaviour of Ni2Mo3N samples for ambient pressure ammonia synthesis. Materials prepared from a NiMoO4 precursor necessarily contain a significant fraction of Ni impurity phase. Materials prepared from this precursor are relatively inactive for ammonia synthesis, whereas Ni2Mo3N of much greater phase purity and catalytic activity can be prepared from precursors employing a modified Pechini method with the use of citrate gels. Ni2Mo3N can be prepared by N2/H2 pre-treatment which represents a significant advantage over routes employing ammonolysis. Bulk lattice nitrogen appears to be relatively unreactive in Ni2Mo3N, although heterolytic nitrogen isotopic exchange studies indicate that a significant degree is exchangeable subject to pre-treatment conditions. The modified Pechini method based route has also been shown to be applicable to the preparation of CoNiMo3N of relatively high phase purity, thereby allowing access to the preparation of quaternary nitrides for catalytic screening.
Nitrides, ammonia, nitrogen, pechini method
0926-860X
Bion, N.
f63add6e-be5f-4114-b296-4aa8e03379f1
Can, F.
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Cook, J
1a9d7348-984c-4734-b2c1-f4f02d0e7fc5
Hargreaves, J.S.J.
998b0c44-afa8-4299-835d-bfd76d47d82f
Hector, Andrew Lee
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Levason, William
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
McFarlane, A.R.
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Richard, M.
663db9af-07d3-462f-918a-1ec2a2172e48
Sardar, K
ab186afa-7f51-4db1-b695-2a481b36dfc7
Bion, N.
f63add6e-be5f-4114-b296-4aa8e03379f1
Can, F.
62dc5d4b-20fa-4f30-aef7-3f0a2a03566b
Cook, J
1a9d7348-984c-4734-b2c1-f4f02d0e7fc5
Hargreaves, J.S.J.
998b0c44-afa8-4299-835d-bfd76d47d82f
Hector, Andrew Lee
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Levason, William
e7f6d7c7-643c-49f5-8b57-0ebbe1bb52cd
McFarlane, A.R.
61cff38b-e735-4621-acd2-b555cb3d4c99
Richard, M.
663db9af-07d3-462f-918a-1ec2a2172e48
Sardar, K
ab186afa-7f51-4db1-b695-2a481b36dfc7

Bion, N., Can, F., Cook, J, Hargreaves, J.S.J., Hector, Andrew Lee, Levason, William, McFarlane, A.R., Richard, M. and Sardar, K (2015) The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N. Applied Catalysis A: General. (doi:10.1016/j.apcata.2014.10.030).

Record type: Article

Abstract

The preparation route has been shown to have a significant influence upon the catalytic behaviour of Ni2Mo3N samples for ambient pressure ammonia synthesis. Materials prepared from a NiMoO4 precursor necessarily contain a significant fraction of Ni impurity phase. Materials prepared from this precursor are relatively inactive for ammonia synthesis, whereas Ni2Mo3N of much greater phase purity and catalytic activity can be prepared from precursors employing a modified Pechini method with the use of citrate gels. Ni2Mo3N can be prepared by N2/H2 pre-treatment which represents a significant advantage over routes employing ammonolysis. Bulk lattice nitrogen appears to be relatively unreactive in Ni2Mo3N, although heterolytic nitrogen isotopic exchange studies indicate that a significant degree is exchangeable subject to pre-treatment conditions. The modified Pechini method based route has also been shown to be applicable to the preparation of CoNiMo3N of relatively high phase purity, thereby allowing access to the preparation of quaternary nitrides for catalytic screening.

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e-pub ahead of print date: 27 October 2014
Published date: 5 September 2015
Keywords: Nitrides, ammonia, nitrogen, pechini method
Organisations: Electrochemistry

Identifiers

Local EPrints ID: 373036
URI: https://eprints.soton.ac.uk/id/eprint/373036
ISSN: 0926-860X
PURE UUID: 00f065b7-1870-4f1f-93a7-3831e8a444fa
ORCID for Andrew Lee Hector: ORCID iD orcid.org/0000-0002-9964-2163
ORCID for William Levason: ORCID iD orcid.org/0000-0003-3540-0971

Catalogue record

Date deposited: 06 Jan 2015 11:50
Last modified: 31 Jul 2019 00:54

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