Abstract
The 14N/15N isotopic exchange pathways over Co 3Mo3N, a material of interest as an ammonia synthesis catalyst and for the development of nitrogen transfer reactions, have been investigated. Both the homomolecular and heterolytic exchange processes have been studied, and it has been shown that lattice nitrogen species are exchangeable. The exchange behavior was found to be a strong function of pretreatment with ca. 25% of lattice N atoms being exchanged after 40 min at 600 C after N2 pretreatment at 700 C compared to only 6% following similar Ar pretreatment. This observation, for which the potential contribution of adsorbed N species can be discounted, is significant in terms of the application of this material. In the case of the Co6Mo6N phase, regeneration to Co3Mo3N under 15N 2 at 600 C occurs concurrently with 14N15N formation. These observations demonstrate the reactivity of nitrogen in the Co-Mo-N system to be a strong function of pretreatment and worthy of further consideration.
| Original language | English |
|---|---|
| Pages (from-to) | 1719-1725 |
| Number of pages | 7 |
| Journal | ACS Catalysis |
| Volume | 3 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2 2013 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Catalysis
- Chemistry(all)
Cite this
A study of 15N/14N isotopic exchange over cobalt molybdenum nitrides. / Hunter, Stuart M.; Gregory, Duncan H.; Hargreaves, Justin S.J.; Richard, Mélissandre; Duprez, Daniel; Bion, Nicolas.
In: ACS Catalysis, Vol. 3, No. 8, 02.08.2013, p. 1719-1725.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A study of 15N/14N isotopic exchange over cobalt molybdenum nitrides
AU - Hunter, Stuart M.
AU - Gregory, Duncan H.
AU - Hargreaves, Justin S.J.
AU - Richard, Mélissandre
AU - Duprez, Daniel
AU - Bion, Nicolas
PY - 2013/8/2
Y1 - 2013/8/2
N2 - The 14N/15N isotopic exchange pathways over Co 3Mo3N, a material of interest as an ammonia synthesis catalyst and for the development of nitrogen transfer reactions, have been investigated. Both the homomolecular and heterolytic exchange processes have been studied, and it has been shown that lattice nitrogen species are exchangeable. The exchange behavior was found to be a strong function of pretreatment with ca. 25% of lattice N atoms being exchanged after 40 min at 600 C after N2 pretreatment at 700 C compared to only 6% following similar Ar pretreatment. This observation, for which the potential contribution of adsorbed N species can be discounted, is significant in terms of the application of this material. In the case of the Co6Mo6N phase, regeneration to Co3Mo3N under 15N 2 at 600 C occurs concurrently with 14N15N formation. These observations demonstrate the reactivity of nitrogen in the Co-Mo-N system to be a strong function of pretreatment and worthy of further consideration.
AB - The 14N/15N isotopic exchange pathways over Co 3Mo3N, a material of interest as an ammonia synthesis catalyst and for the development of nitrogen transfer reactions, have been investigated. Both the homomolecular and heterolytic exchange processes have been studied, and it has been shown that lattice nitrogen species are exchangeable. The exchange behavior was found to be a strong function of pretreatment with ca. 25% of lattice N atoms being exchanged after 40 min at 600 C after N2 pretreatment at 700 C compared to only 6% following similar Ar pretreatment. This observation, for which the potential contribution of adsorbed N species can be discounted, is significant in terms of the application of this material. In the case of the Co6Mo6N phase, regeneration to Co3Mo3N under 15N 2 at 600 C occurs concurrently with 14N15N formation. These observations demonstrate the reactivity of nitrogen in the Co-Mo-N system to be a strong function of pretreatment and worthy of further consideration.
UR - http://www.scopus.com/inward/record.url?scp=84881289328&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84881289328&partnerID=8YFLogxK
U2 - 10.1021/cs400336z
DO - 10.1021/cs400336z
M3 - Article
AN - SCOPUS:84881289328
VL - 3
SP - 1719
EP - 1725
JO - ACS Catalysis
JF - ACS Catalysis
SN - 2155-5435
IS - 8
ER -