Abstract
Summary Reduction of ion exchanged Pt 2+ and Cu 2+ ions with H 2 forms metal atoms and protons of high Bronsted acidity. The “coke” deposits formed during methylcyclopentane (MCP) conversion have been analyzed by temperature programmed oxidation (TPO). Acid sites are instrumental in ring enlargement of MCP; Cu atoms dilute Pt ensembles required for ring opening. Coke deposits on metal and acid sites give rise to different TPO peaks, the high temperature peak increases with the concentration of Bronsted sites. For high Cu/Pt ratios, coke formation on metal particles is negligible, showing that coke formation on metal surfaces is ensemble-specific.
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