The thermostabilizing effect of lanthanum on γ-Al2O3 studied by low-energy ion scattering
- van Leerdam, G.C.
- Brongersma, H. H.
- Tijburg, I. I.M.
- Geus, J. W.
DOIAbstract
Low-energy ion scattering has been used to study the surface of lanthanum thermostabilized γ-Al2O3 during several stages of the sintering process. Deposition of lanthanum onto the support by specific adsorption of a [La(EDTA)]- complex turns out to be homogeneous. After calcination at 550°C La2O3 particles have been formed on the surface, while LEIS results after sintering at 1050°C indicate the formation of a lanthanum-aluminate surface layer. The presence of lanthanum prevents transformation of γ-Al2O3 to α-Al2O3 at 1050°C
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