摘要:
The invention concerns recyclable solid oxidation catalysts comprising a metal compound of a pentavalent or hexavalent metal M and selected among the group consisting of tantalum, vanadium, niobium, chromium, molybdenum, tungsten, grafted at the surface of a solid oxide with at least one, preferably one, covalent bond between an oxygen atom of the solid oxide and the metal M atom, the grafted metal compound having at least two alkoxy groups bound to the metal by the oxygen atom. Preferably, at least 2 alkoxy groups bound to the metal M belong to a polyol unit, preferably diol. The invention also concerns oxidation methods, in particular epoxidation methods using same.
摘要:
The invention relates to a method of reducing the ionic metal content of aqueous effluents. The inventive method consists in bringing an aqueous effluent loaded with metal ions into contact with at least one hydrogen-covered metal.
摘要:
New 1,2,3- or 1,2,3,4- or 1,2,3,4,5- substituted imidazolium salts and their uses as solvent in catalysed organic reactions, as well as compositions containing them and a transition metal compound. They can be used in the following reactions: telomerisation of conjugated dienes, dimerisation of olefins, oligomerisation of olefins, polymerization of olefins, alkylation of olefins, hydrogenations of olefins, olefin metathesis, hydroformylation of olefins, ring-closing metathesis of olefins, ring-opening metathesis polymerisation of olefins, symmetric or asymmetric epoxidation of olefins (including heteroatom substituted olefins) and cyclopropanation of olefins, condensation reaction, hydrogenation reactions, isomerisation reaction, Suzuki cross-coupling reactions, amination reaction, partial oxidation of alkanes, kinetic resolution of racemic mixtures, hydrogenation of imines, hydrogenation of ketones, transfer hydrogenation and hydroxylation of aromatic organic compounds.
摘要:
The invention concerns the use of a catalyst comprising chromium hydride species heat-stable at 400 °C, bound to the surface of a mineral support, in particular silica, for olefin polymerisation.
摘要:
The invention relates to a method for the elimination of metal ions from aqueous media, such as zinc, lead, chrome, copper, iron, aluminium, manganese, cadmium, cerium or silver and mixtures of said metals present in a trace or ultratrace state in aqueous effluents, by adsorption on a solid charge containing a metal chosen from group VIII.