Catalyst consisting of a transition metal supported on a...

B - Operations – Transporting – 01 – J

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B01J 23/30 (2006.01) B01J 21/08 (2006.01) C07C 6/04 (2006.01) B01J 23/28 (2006.01) B01J 23/36 (2006.01) B01J 37/02 (2006.01)

Patent

CA 2450374

An olefin metathesis catalyst consists essentially of a transition metal or oxide thereof, preferably tungsten oxide, supported on a high purity silica support possessing less than 150 ppm Mg, less than 900 ppm Ca, less than 900 ppm Na, less than 200 ppm Al, and less than 40 ppm Fe. The support possesses low amounts of acidic or basic sites such that in the reaction of pure butene- 1 over said catalyst under metathesis reaction conditions the reaction possesses a weight selectivity to hexene-3 of at least 55 wt%.

L'invention concerne un catalyseur de métathèse d'oléfines comprenant principalement un métal de transition ou un oxyde de celui-ci, de préférence un oxyde de tungstène, monté sur un support de silice pur contenant moins de 150 ppm de Mg, moins de 900 ppm de Ca, moins de 900 ppm de Na, moins de 200 ppm d'Al, et moins de 40 ppm de Fe. Ce support présente de faibles quantités de sites acides ou basiques de sortie que lorsqu'on fait réagir du butène-1 pur sur ledit catalyseur dans des conditions réactionnelles de métathèse, cette réaction présente une sélectivité de poids pour l'hexène-3 atteignant moins 55% en poids.

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