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Addition of propene to carbon monoxide-hydrogen in higher alcohol synthesis over unpromoted and caesium-promoted ZnCrO catalysts

Applied Catalysis A: General, ISSN: 0926-860X, Vol: 79, Issue: 2, Page: 181-190
1991
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Catalytic activity tests in higher alcohol synthesis over unpromoted and caesium-promoted ZnCrO catalysts with the addition of propene to CO-H 2 have been performed to clarify the role of alkenes in the chain growth to higher oxygenates. Over the unpromoted catalyst, the observed increments of selected products (1-butanol, 2-methyl-1-butanol, 1-methoxy-2-methyl-butane, C 7 ketone) upon the addition of propene are consistent with the occurrence of a hydrocarbonylation reaction of propylene to an aldehydic linear C 4 intermediate, which is successively transformed according to previously established reaction paths of higher alcohol synthesis over ZnCrO catalysts. Hydrocarbonylation is slower than aldol condensation, and the influence of propene addition is greatly reduced over the caesium-promoted catalyst as well as at higher reaction temperatures. We conclude that the contribution of alkenes to the reaction scheme of higher alcohol synthesis over alkali-promoted ZnCrO catalysts is apparently unimportant.

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