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- W4232607776 abstract "Mixed copper-chromium oxides are good catalysts for the selective hydrogenation of polyunsaturated organic compounds. Our previous study of the hydrogenation of light unsaturated molecules in the gaseous phase has been extended to heavier molecules in the liquid phase. The selectivity in monohydrogenation is excellent (100%) for conjugated dienes but much lower for α,β-unsaturated carbonyls. This is due to adsorption competition between the last starting molecules and some primary products such as unsaturated alcohols. The α-unsaturated alcohols react with hydrogen via four different routes: (a) hydrogenation; (b) hydrodehydroxylation; (c) nucleophilic substitution; and (d) bimolecular elimination. The hydrogenation site is an octahedrally coordinated Cu+ ion with two anionic vacancies and an attached hydride ion (H−). The Cr3+ ion in the same environment is probably the active site for reactions (b), (c) and (d). These results are discussed and compared to those obtained in homogeneous systems and striking similarities are demonstrated." @default.
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- W4232607776 date "1989-11-01" @default.
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- W4232607776 title "Selective hydrogenation of heavy polyunsaturated molecules on copper-chromium catalysts" @default.
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- W4232607776 doi "https://doi.org/10.1016/0304-5102(89)80251-2" @default.
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