Abstract
XPS data indicate that Pt in a highly chlorided (5–10% Cl) Pt-Al2O3 catalyst is present in a metallic form, and is not chlorided. Surface chloride concentration decreases following reduction in hydrogen; exposure to oxygen increases the surface chloride concentration. In contrast, reduction of chloride containing Pt-SiO2 catalyst dramatically reduces the chloride level; in addition, treatment with CCl4 appears to reoxidize at least some of the Pt in the Pt-SiO2 catalyst.
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