Abstract
Previously it was shown that nitric oxide chemisorbs on a series of supported transition metal surface ions at room temperature, with one NO molecule being adsorbed per surface ion. The study of NO chemisorption on supported cobalt and nickel oxides has been pursued further to characterize the catalyst-support interactions. On cobalt aluminate the chemisorption was found to be very small. This was explained by the shielding of the tetrahedrally coordinated cobaltous ions from the surface by the oxygen ions in this spinel compound. The explanation is supported by the ion-scattering spectra of the COA12O4 surface. Measurement of the NO uptake of cobalt and nickel oxide catalysts variously supported, after heat-treatments at successively increasing temperatures, has revealed the different character of the support-catalyst interaction. On zirconia, the area of the NO uptake reaches the value of the BET area. On alumina, there is diffusion of the cobalt or nickel ions into the bulk of the support accompanied by spinel formation. Diffusion into the bulk occurs also, to some degree, on preformed cobalt-aluminate support. The supported cobalt and nickel catalysts represent complex systems and at low metal ion loadings on a zirconia support, multiple NO adsorption on a surface metal ion was noted.
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© 1975 Plenum Press, New York
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Yao, H.C., Shelef, M. (1975). Use of NO Chemisorption for the Study of Catalyst Support Interactions. In: Klimisch, R.L., Larson, J.G. (eds) The Catalytic Chemistry of Nitrogen Oxides. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8741-5_4
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DOI: https://doi.org/10.1007/978-1-4615-8741-5_4
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