Ifp Energies Nouvelles

Alexandre Chambard

Amandine Cabiac

Cecile Thomazeau

Yohan Florent Oudart

Vincent Zozaya

Disclosed are a catalyst, its preparation and use in selective hydrogenation, which catalyst has a porous support grain on which are deposited palladium and silver, and at least one alkali and/or alkaline earth metal; the porous support contains a refractory silica, alumina and/or silica-alumina oxide, where at least 80 wt. % of the palladium is distributed in a crust at the periphery of the support, and at least 80 wt. % of the silver is distributed in a crust at the periphery of the support, the local content of palladium at each point along the diameter of the grain follows the same course as the local content of silver.

Catalyst comprising palladium and silver, and its application for selective hydrogenation

The invention relates to a method of preparing a dehydrogenation catalyst comprising a group VIII metal, a group IVA metal and a refractory oxide support. The method comprises stages of preparing the dry impregnation aqueous solution containing said group VIII metal, ammonia, either in solution or in gas form, and a complexing agent. It then comprises stages of aging the aqueous solution, of dry impregnation of the support, of maturing the impregnated support, of drying the impregnated support and of calcining the dried support.

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Javerlhac, France

Alexandre Chambard