Institut Francais Du Pe'trole

Christophe Gautreau

Blaise Didillon

Charles Cameron

Denis Uzio

Helene Olivier-Bourbigou

Gerard Hillion

David Proriol

Laurent Savary

A process for the selective hydrogenation of diolefinic compounds to mono-olefinic compounds uses a catalyst composition comprising at least one salt of a transition metal from groups IB, IIB, VB, VIB, VIIB and VIII of the periodic table, at least one ligand and at least one organometallic reducing agent, optionally in the presence of a non-aqueous ionic liquid selected from the group formed by liquid salts with general formula QA(in which Qrepresents a quaternary ammonium and/or quaternary phosphonium and Arepresents any anion which can form a liquid salt below 90&#xb0; C.).

Method for selective hydrogenation of polyunsaturated compounds into monounsaturated compounds using a homogeneous catalyst

A catalyst for selective hydrogenation of unsaturated diolefinic and styrenic compounds in gasolines without hydrogenating the aromatic and mono-olerinic compounds is described. It can also eliminate marcaptans when they are present in these gasolines. The catalyst comprises particulate support on which palladium is deposited, distributed at the periphery of the catalyst particles, and at least one metal selected from molybdenum and tungsten, in the form of at least one oxide.

Catalyst for treating gasoline cuts containing diolefins, styrenic compounds and possibly mercaptans

For transforming unsaturated diolefinic hydrocarbons to a &agr;-olefinic hydrocarbons at rates which are at least 1.5 times higher than the rate of hydrogenation of &agr;-olefinic hydrocarbons to saturated compounds, the catalyst contains palladium distributed at the periphery of particles (spherules or extrduates), and at least one element selected from tin and lead. Further, the tin and/or lead is advantageously distributed at the periphery of the spherules or extrudates.

Selective hydrogenation of diolefins to the olefins employing catalysts containing palladium, also tin and/or lead

A particulate selective hydrogenation catalyst for hydrogenating unsaturated diolefinic hydrocarbons to &agr;-olefinic hydrocarbons at rates which are at least 1.5 times higher than the rate of hydrogenation of &agr;-olefinic hydrocarbons to saturated compounds contains palladium distributed at the periphery of particles (spherules or extrudates), and at least one element selected from tin and lead. Further, the tin and/or lead is advantageously distributed at the periphery of the spherules or extrudates.

Selective hydrogenation catalysts containing palladium, also tin and/or lead, and the preparation and use thereof

A particulate selective hydrogenation catalyst for transforming unsaturated diolefinic hydrocarbons to .alpha.-olefinic hydrocarbons is described, for the hydrogenation of diolefinic compounds to .alpha.-olefinic compounds at rates which are at least 1.5 times higher than the rate of hydrogenation of .alpha.-olefinic hydrocarbons to saturated compounds. The catalyst contains palladium distributed at the periphery of particles (spherules or extrudates), and at least one element selected from tin and lead. Further, the tin and/or lead is advantageously distributed at the periphery of the spherules or extrudates. The catalyst preparation is also described, as well as a process for selective hydrogenation of diolefins to .alpha.-olefins using the catalyst.

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Montesson, France

Christophe Gautreau