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- W1985016856 abstract "STM, NEXAFS, XPS, and TPR have been used to characterize the adsorption and reactivity of methyl pyruvate on Pt{111}. In the absence of coadsorbed hydrogen, methyl pyruvate polymerizes at room temperature yielding polymer chains, partly dendritic. The STM and XPS data provide independent estimates of the average length, found to be ∼9 monomer units. NEXAFS shows that this polymer contains CO bonds and no CC bonds; the CO bonds are inclined at 64° ± 5° with respect to the metal surface. It is proposed that polymerization occurs by hydrogen elimination from the monomer, followed by an aldol condensation that involves elimination of methanol. This mechanism is in excellent accord with the intramolecular bonding, shape, and reactivity of the polymer deduced from the NEXAFS, STM, and TPR results. Coadsorbed hydrogen completely suppresses polymerization. These findings suggest that irreversible deactivation during start-up or steady-state operation of Pt catalysts during enantioselective hydrogenation of alkyl ..." @default.
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- W1985016856 date "2000-09-15" @default.
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- W1985016856 title "Fundamental Aspects of Enantioselective Heterogeneous Catalysis: the Surface Chemistry of Methyl Pyruvate on Pt{111}" @default.
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- W1985016856 doi "https://doi.org/10.1021/jp002063+" @default.
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