Abstract
The effect of adding Sn to Pt and Rh particles on SiO, is examined by transmission electron microscopy following heat treatments in H 2 and O 2 atmospheres. With both metals, after heating in H 2, no fcc metal is observed but rather a series of intermetallic compounds with multiple phases coexisting within most 20 to 200-A particles. The surfaces of these particles are the Sn-rich MSn 4 phases. When Pt-Sn is oxidized, the only phases observed are Pt metal and SnO 2. Dark field imaging shows that the SnO 2 forms 10 to 30-Å crystals which surround the single-crystal Pt particles and are in contact with the SiO 2. When Rh-Sn is oxidized Rh, Rh 2O 3, and SnO 2 are detected, but SnO 2 forms before Rh 2O 3, and the presence of Sn retards the oxidation of Rh.
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