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首页> 外文期刊>Catalysis science & technology >Effect of AlSiOx support modification by alkali or alkaline earth metals on propene formation in the metathesis of C2H4 and 2-C4H8 over MoOx-based catalysts
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Effect of AlSiOx support modification by alkali or alkaline earth metals on propene formation in the metathesis of C2H4 and 2-C4H8 over MoOx-based catalysts

机译：碱金属或碱土金属对碳氧化钼基催化剂复分解中AlSiOx载体改性对丙烯生成的影响

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摘要

The metathesis of ethylene with 2-butene to propene is currently applied for large-scale on-purpose production of this building block of the chemical industry. MoOx-based supported catalysts are promising alternatives to the industrially applied WOx-containing systems. The activity of such catalysts depends on the amount of active Mo–carbene (MoCHR) sites formed in situ upon reaction of supported MoOx species with olefins. Herein, we demonstrate a way to control the ability of such species on the surface of AlSiOx to be transformed into Mo–carbenes by promoting the support with tiny amounts of alkali or alkaline earth metal (Li, Sr, Ca, Mg, Na, K, Ba, Rb, or Cs) oxides. The electrophilic properties of these additives were established to be relevant for in situ transformation of supported MoOx species into Mo–carbenes. The additive electronegativity (Pauling scale) affects olefin adsorption and therefore the formation of carbenes.
机译：乙烯与2-butene的置换作用丙烯是目前大规模应用刻意的构建块的生产化工行业。催化剂是很有前途的替代工业应用WOx-containing系统。这种催化剂活性取决于数量活跃Mo-carbene (Mo空空)网站形成的现场支持MoOx物种与反应烯烃。这种表面物种的能力AlSiOx转化成Mo-carbenes促进与微量的碱的支持或碱土金属(李、Sr、钙、镁、钠、钾、英航、Rb或Cs)氧化物。建立了这些添加剂的性质对原位转化有关支持MoOx Mo-carbenes物种。电负性添加剂(鲍林规模)影响烯烃吸附,因此碳烯的形成。

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