Abstract
Vapor-phase dehydrogenation of 1,3-butanediol into 4-hydroxy-2-butanone was examined over copper catalysts modified with ZnO, ZrO 2, Al 2O 3, and MgO. 4-Hydroxy-2-butanone was efficiently produced by the dehydrogenation of 1,3-butanediol over pure Cu and Cu/ZnO catalysts. However, the selectivity to 4-hydroxy-2-butanone decreases with increasing conversion of 1,3-butanediol, while the selectivity to butanone increases. Addition of Al 2O 3 and ZrO 2 to the catalysts decreases the selectivity to 4-hydroxy-2-butanone because of the enhancement of dehydration of 4-hydroxy-2-butanone into 3-buten-2-one and the following hydrogenation into butanone. An addition of basic MgO increases the formation of propanone via the retro-aldol reaction of 4-hydroxy-2-butanone.
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