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Sintering of alumina-supported nickel particles under amination conditions: Support effects

Lif, Johan; Odenbrand, Ingemar LU and Skoglundh, Magnus (2007) In Applied Catalysis A: General 317(1). p.62-69
Abstract
The sintering of alumina-supported nickel particles has been studied after heat-treatment in ammonia + hydrogen at 523 K and 250 bar. The investigated samples were nickel supported on gamma-alumina, transalumina and alpha-alumina, and co-precipitated nickel oxide-alumina. The sintering process was mainly followed by hydrogen chemisorption. The samples were also characterised by specific surface area measurements, X-ray diffraction, temperature programmed desorption of ammonia, in situ FTIR spectroscopy and temperature programmed reduction. For nickel supported on gamma-alumina, up to 40% of the initial metal surface area remained after the heat-treatment in ammonia + hydrogen compared with alpha-alumina or transalumina where only 10-20% of... (More)
The sintering of alumina-supported nickel particles has been studied after heat-treatment in ammonia + hydrogen at 523 K and 250 bar. The investigated samples were nickel supported on gamma-alumina, transalumina and alpha-alumina, and co-precipitated nickel oxide-alumina. The sintering process was mainly followed by hydrogen chemisorption. The samples were also characterised by specific surface area measurements, X-ray diffraction, temperature programmed desorption of ammonia, in situ FTIR spectroscopy and temperature programmed reduction. For nickel supported on gamma-alumina, up to 40% of the initial metal surface area remained after the heat-treatment in ammonia + hydrogen compared with alpha-alumina or transalumina where only 10-20% of the initial metal surface area remained after the heat-treatment. The sintering can be correlated to the bond strength between the metal particle and the support. The larger the number of low-coordinated surface aluminium sites is, as for gamma-alumina, the stronger the metal-support interaction is and this in turn suppresses diffusion of nickel particles and/or atoms. (c) 2006 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
amination catalysis, coordination number, Lewis acids sites, alumina, sintering, nickel
in
Applied Catalysis A: General
volume
317
issue
1
pages
62 - 69
publisher
Elsevier
external identifiers
  • wos:000243665000008
  • scopus:33845435549
ISSN
0926-860X
DOI
10.1016/j.apcata.2006.10.003
language
English
LU publication?
yes
id
67af3402-e1f6-451c-9d6c-da9aaa910090 (old id 676747)
date added to LUP
2007-12-13 11:18:38
date last changed
2017-11-19 04:13:33
@article{67af3402-e1f6-451c-9d6c-da9aaa910090,
  abstract     = {The sintering of alumina-supported nickel particles has been studied after heat-treatment in ammonia + hydrogen at 523 K and 250 bar. The investigated samples were nickel supported on gamma-alumina, transalumina and alpha-alumina, and co-precipitated nickel oxide-alumina. The sintering process was mainly followed by hydrogen chemisorption. The samples were also characterised by specific surface area measurements, X-ray diffraction, temperature programmed desorption of ammonia, in situ FTIR spectroscopy and temperature programmed reduction. For nickel supported on gamma-alumina, up to 40% of the initial metal surface area remained after the heat-treatment in ammonia + hydrogen compared with alpha-alumina or transalumina where only 10-20% of the initial metal surface area remained after the heat-treatment. The sintering can be correlated to the bond strength between the metal particle and the support. The larger the number of low-coordinated surface aluminium sites is, as for gamma-alumina, the stronger the metal-support interaction is and this in turn suppresses diffusion of nickel particles and/or atoms. (c) 2006 Elsevier B.V. All rights reserved.},
  author       = {Lif, Johan and Odenbrand, Ingemar and Skoglundh, Magnus},
  issn         = {0926-860X},
  keyword      = {amination catalysis,coordination number,Lewis acids sites,alumina,sintering,nickel},
  language     = {eng},
  number       = {1},
  pages        = {62--69},
  publisher    = {Elsevier},
  series       = {Applied Catalysis A: General},
  title        = {Sintering of alumina-supported nickel particles under amination conditions: Support effects},
  url          = {http://dx.doi.org/10.1016/j.apcata.2006.10.003},
  volume       = {317},
  year         = {2007},
}