Abstract
Metal atoms of Pt and Sn have been solvated at low temperatures, and these solvated metal atoms have been used for depositing Pt-Sn bimetallic particles on Al 2O 3 (full SMAD method). Spectroscopic investigations with XPS, XRD, EXAFS, and Mössbauer have confirmed the presence of very small and/or amorphous Pt-Sn particles. Catalytic performance tests show that these particles are active for dehydrocyclization reactions, but depress unwanted hydrogenolysis reactions. Our results, compared with results for conventionally prepared and half-SMAD methods (Sn 0 on preformed Pt particles), show that Sn 0 within and on Pt particles has a significant effect on catalyst performance, and suggest that such performance can be predictably modified by using the correct preparation procedure (SMAD or conventional). The effect of tin is also perhaps now better understood due to these results.
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