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>Fundamentals and application potential of the synergy effect between ZnO and Mo/SiO2 for propene production in the metathesis of ethylene and trans-2-butene
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Fundamentals and application potential of the synergy effect between ZnO and Mo/SiO2 for propene production in the metathesis of ethylene and trans-2-butene
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机译：Fundamentals and application potential of the synergy effect between ZnO and Mo/SiO2 for propene production in the metathesis of ethylene and trans-2-butene
The metathesis of ethylene with 2-butene to propene is a 100%-carbon-efficient process for on-purpose production of this important building block in the chemical industry.Herein,we demonstrate that the activity of Mo/SiO2 can be increased up to 270-fold when using ZnO as a cocatalyst,which is inert for the target reaction.An intimate physical contact between ZnO and Mo/SiO2 is required to efficiently use the enhancing effect of the cocatalyst.H/D isotopic exchange tests with 2-C4H8 and 2-C4D8 suggest that the enhancing effect depends on the ability of ZnO to activate 2-butene.A gas-phase promoter(not 1-butene but probably butene radical)formed in this reaction is suggested to contribute to the formation of catalytically active Mo-carbenes under reaction conditions and/or hinder their transformation into inactive ones.This fundamental knowledge opens the possibility for further improvements through catalyst or cocatalyst design and reactor operation.The obtained results are also attractive from a practical point of view.Both ZnO and Mo/SiO2 can be regenerated without changing their initial performance as proven in several metathesis/regeneration cycles.
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