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کاتالیزور کاربردی a: عمومی 2012
جزئیات رویداد
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  • liquid- and vapor-phase hydrogenation of 1-epoxy-3-butene using self-assembled monolayer coated palladium and platinum catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     alkanethiol self-assembled monolayers (sams) have recently been shown to be effective catalyst modifiers for increasing the selectivity of the hydrogenation of 1-epoxy-3-butene (epb) to 1-epoxybutane in the gas phase. in the results reported here, we demonstrate that sam coatings can similarly be applied to other supported metals (pt) and in liquid-phase reaction environments. coating a pt/al2o3 catalyst with n-octadecanethiol resulted in a large improvement in selectivity during vapor-phase epb hydrogenation, similar to that observed for supported pd. the liquid phase hydrogenation of epb using sam-coated catalysts showed similar selectivity trends in some cases, but interactions of the solvent with the sam were also important in controlling selectivity. in particular, using a heptane solvent, epoxybutane selectivity increased from 36% with an uncoated pd/al2o3 catalyst to 74% with a thioglycerol sam-coated catalyst. sam quality was shown to have a strong impact on the rate of reaction but little effect on selectivity. the results generally indicated that selectivity modification with thiol sams is extendable to other supported metals and a variety of reaction environments.

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