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Deactivation of Alumina Supported Catalysts Due to Spinel Formation

Published online by Cambridge University Press:  15 February 2011

P. H. Bolt ,
M. E. Van Ipenburg ,
J. W. Geus  and
F. H. P. M. Habraken
P. H. Bolt
Affiliation:
Debye Institute, Utrecht University Department of Atomic and Interface Physics, P.O. Box 80000, 3508 TA Utrecht, the Netherlands Department of Inorganic Chemistry, P.O. Box 80083, 3508 TB Utrecht, the Netherlands
M. E. Van Ipenburg
Affiliation:
Debye Institute, Utrecht University Department of Atomic and Interface Physics, P.O. Box 80000, 3508 TA Utrecht, the Netherlands
J. W. Geus
Affiliation:
Debye Institute, Utrecht University Department of Inorganic Chemistry, P.O. Box 80083, 3508 TB Utrecht, the Netherlands
F. H. P. M. Habraken
Affiliation:
Debye Institute, Utrecht University Department of Atomic and Interface Physics, P.O. Box 80000, 3508 TA Utrecht, the Netherlands
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Abstract

An important cause of deactivation of alumina supported transition metal (oxide) catalysts is a solid state reaction between the active component and the support. We therefore studied the hightemperature behavior of Me layers (Me = Co, Ni, Cu and Fe) on polycrystalline α-A12O3 and γ- Al2O3 substrates. The samples were first oxidized at moderate temperatures and then annealed at high temperatures (up to 1000 °C) in O2, N2, or N2/O2 mixtures. The interfacial reaction to MeA12O4 was assessed using Rutherford Backscattering Spectrometry and X-ray diffraction. The reaction rate strongly depends on the transition metal element Me: Fe < Ni < Co < Cu. Low oxygen pressures favour spinel formation. γ-A12O3 shows a much higher reactivity towards the MeOx overlayers than α-Al2O3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 15
Copyright
Copyright © Materials Research Society 1994

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