Sintering of alumina-supported nickel particles under amination conditions: Support effects
Journal article, 2007

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

Amination catalysis

Lewis acids sites

Nickel

Sintering

Coordination number

Alumina

Author

Johan Lif

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Ingemar Odenbrand

Lund University

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Applied Catalysis A: General

0926-860X (ISSN) 1873-3875 (eISSN)

Vol. 317 1 62-69

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Energy

Materials Science

Subject Categories

Chemical Engineering

DOI

10.1016/j.apcata.2006.10.003

More information

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3/2/2018 9