Abstract
In this study several complementary methods as XRD, HRTEM, O 2 and H 2 adsorption, as well as H 2–O 2 titration were used for characterization of the metallic phase in 0.5–3.0 wt.% Pt/ZnAl 2O 4 catalysts. Three nanocrystalline ZnAl 2O 4 spinels used as a supports were prepared by the solvothermal and co-precipitation method. It was found that irrespective of the preparation method they form very good support materials with a high capacity to achieve high platinum dispersion. O 2 and H 2 chemisorption data showed metal dispersion up to 90% and good correspondence with HRTEM results was observed. The H 2–O 2 titration method may be applied for determination of Pt dispersion only in the high-loaded Pt/ZnAl 2O 4 catalysts. The catalytic performances of Pt supported on the prepared spinels were evaluated in the propane total oxidation reaction.
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