title: Effect of support on metathesis of n-decane: drastic improvement in alkane metathesis with WMe5 linked to silica-alumina.
abstract: [WMe6 ] (1) supported on the surface of SiO2 -Al2 O3(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 -Al2 O3(500) (2) transformed at 120 °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.
authors.affiliation: KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal 23955-6900 (Kingdom of Saudi Arabia).
authors.forename: Manoja K
authors.initials: MK
authors.lastname: Samantaray
authors.forename: Raju
authors.initials: R
authors.lastname: Dey
authors.forename: Edy
authors.initials: E
authors.lastname: Abou-Hamad
authors.forename: Ali
authors.initials: A
authors.lastname: Hamieh
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Basset
keywords: alkanes; metathesis; solid-state NMR spectroscopy; supported catalysts; tungsten