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Effect of Support on Metathesis of n-Decane: Drastic Improvement in Alkane Metathesis with WMe5 Linked to Silica-Alumina

机译:载体对正癸烷复分解的影响:WMe5与二氧化硅-氧化铝连接的烷烃复分解反应的显着改善。

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[WMe6] (1) supported on the surface of SiO2-Al2O3(500) (2) has been extensively characterized by solid-state NMR spectroscopy, elemental analysis, and gas quantification, which clearly reveal the formation of a mixture of monopodal and bipodal species with the migration of methyl from W to Al. The supported species SiO2-Al2O3(500) (2) transformed at 120 degrees C into two types of carbynic centers, one of which is cationic and the other neutral. These species are very efficient for the metathesis of n-decane. Comparison with already-synthesized neutral bipodal tungsten indicates that the high increase in activity is due to the cationic character of the grafted tungsten.
机译:[WMe6](1)负载在SiO2-Al2O3(500)(2)的表面已通过固态NMR光谱,元素分析和气体定量进行了广泛表征,清楚地揭示了单足和双足混合物的形成物种从W迁移到Al。负载的SiO2-Al2O3(500)(2)物种在120摄氏度下转变为两种碳烯中心,一种是阳离子型,另一种是中性的。这些物质对于正癸烷的复分解非常有效。与已经合成的中性双足性钨的比较表明,活性的高增加是由于接枝钨的阳离子特性。

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