Palladium-based catalyst for selective hydrogenation of...

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B01J 23/44 (2006.01) B01J 37/02 (2006.01) C07C 5/09 (2006.01)

Patent

CA 2519994

The present invention describes a Pd-catalyst, further consisting of La, Ti, Nb, K or Si, which have high ethylene selectivity even after a low temperature reduction in the se-lective hydrogenation of acetylene to ethylene and the production method of the same. A catalyst of the invention consists essentially of 0.05 to 2.0% by weight, based on the supported catalyst, of palladium and one or two metals chosen form the group consist-ing of lanthanum, niobium, titanium, potassium and silicon. The said catalyst is pre- pared by the following procedure: 1) Impregnating a support in aqueous solution of tetra amine palladium hydroxide, followed by drying and calcination; 2) The second and, if necessary, a third metal is impregnated by impregnating the Pd-catalyst in the solution of the metal precursor followed by drying and calcina-tion; 3) The catalyst according to step (2) is then reduced in hydrogen at 200~C to 600~C for 1 to 5 hours.

La présente invention concerne: un catalyseur à base de Pd comprenant en outre La, Ti, Nb, K ou Si, lesquels corps présentent une grande sélectivité pour l'éthylène, même après réduction à basse température dans le processus d'hydrogénation sélective du l'acétylène en éthylène; et un procédé de fabrication correspondant. Le catalyseur de l'invention comprend essentiellement de 0,05 à 2.0 % en poids, basé sur le catalyseur supporté, de palladium et de un ou deux métaux pris dans le groupe composé de lanthanum, niobium, titane, potassium et silicium. Ledit catalyseur est préalablement préparé comme suit: 1) imprégnation d'un support de séchage et de calcination; 2) imprégnation du second et, au besoin d'un troisième métal par imprégnation du catalyseur Pd dans la solution du précurseur métallique suivie de séchage et de calcination; 3) réduction du catalyseur selon l'opération (2) en hydrogène à 200-600 ·C pendant 1 à 5 heures.

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