Buscar
Mostrando ítems 1-10 de 74
Keggin heteropolyacids Mo-based as catalysts in the green and selective oxidation of diphenyl sulfide
(Elsevier, 2013-03)
Heteropolyacids are used as redox catalysts due to their bifunctional properties. Some advantages over conventional catalysts, such as selectivity, easy isolation and reuse, are worth noting. In homogeneous conditions their ...
Effect of the support on a new metanethole synthesis heterogeneously catalyzed by Keggin heteropolyacids
(Elsevier Science, 2006-02)
Keggin heteropolyacids, supported on solids of different nature and textural characteristics, were used in the reaction of anethole dimerization in order to obtain metanethole. The characterization by Fourier transform ...
Heteropolyacids with Keggin structure supported on silica-alumina
(Inderscience Enterprises, 2006-08-16)
The behaviour of molybdophosphoric acid, with Keggin structure, supported on different silica-alumina mixtures, obtained by sol-gel method, was studied. Different techniques were used to synthesise the supports. In one of ...
Simple and Friendly Sulfones Synthesis Using Aqueous Hydrogen Peroxide with a Reusable Keggin Molybdenum Heteropolyacid, Immobilized on Aminopropyl-Functionalized Silica
(Taylor & Francis, 2009-11-19)
Keggin molybdenum heteropolyacid (H3PMo12O40), immobilized on aminopropyl-functionalized silica catalysts, were made using two immobilization methods: incipient wetness and equilibrium adsorption. The material prepared for ...
Vanadium-substituted keggin type heteropolyacid are used for the selective oxidation of sulfides to sulfoxides and sulfones using hydrogen peroxide
(Bentham Science Publishers, 2007-12)
Various types of aromatic and aliphatic sulfides are selectively oxidized to sulfoxides and sulfones with good to excellent yields using H2O2 35% p/V in the presence of catalytic amounts of Keggin heteropolyacid (H5PMo11Al0.5O40) ...
Selective Oxidation of Sulfides to Sulfoxides Using Modified Keggin Heteropolyacids as Catalyst
(Taylor & Francis Ltd, 2014-11-21)
The use of modified Keggin phosphomolybdic heteropolyacids (HPA) (V and Al) as catalysts in the selective oxidation of sulfides to the corresponding sulfoxides is reported. Excellent yields were obtained (13 examples: ...