Sintering of alumina-supported nickel particles under amination conditions: Support effects
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/676747
- author
- Lif, Johan ; Odenbrand, Ingemar LU and Skoglundh, Magnus
- organization
- publishing date
- 2007
- 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
- 2016-04-01 16:54:01
- date last changed
- 2023-11-14 19:56:53
@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}},
keywords = {{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}},
doi = {{10.1016/j.apcata.2006.10.003}},
volume = {{317}},
year = {{2007}},
}