Rhodia Chimie

Rhone-poulenc Chimie

Rhodia Operations

Rhodia Electronics & Catalysis

Adisseo Ireland Limited

Rhodial Chimie

Psa Automobiles Sa

Irma

Gilbert Blanchard

Olivier Touret

Eric Quemere

Jean-Yves Chane-Ching

Virginie Harle

Maryline Aubert

Thierry Seguelong

Patrick Rey

Christian Hamon

Claire Pitois

Thierry Birchem

Bruno Tolla

William Pierre Mustel

Val&eacute;rie Visciglio

Valerie Visciglio

Nils Matthess

Jean-Nicolas Lesueur

Alain Sassi

Stéphan Verdier

Thierry Bertin

The invention relates to a dispersion of the type comprising particles of a rare earth compound, particularly a compound of cerium, an acid and an organic phase, characterized in further comprising an anti-oxidant agent which can particularly be selected from substituted derivatives of phenol, aromatic amines or tocopherols. Said dispersion may be used as additive for diesel fuel for internal combustion engines, in particular as additive for diesel for diesel engines.

Colloidal dispersion of a rare earth compound comprising an anti-oxidant agent and use thereof as additive for diesel fuel for internal combustion engines

The invention relates to a process for preparing 2-oxo-4-methylthiobutyric acid (I), its salts and its derivatives 

Synthesis and applications of 2-oxo-4-methylthiobutyric acid, its salts and its derivatives

The colloidal dispersion of the invention is characterized in that it comprises an organic phase; particles of an iron compound in its amorphous form; and at least one amphiphilic agent. It is prepared by a process in which either an iron salt in the presence of an iron complexing agent or an iron complex is reacted with a base, maintaining the pH of the reaction medium at a value of at most 8 to obtain a precipitate, the iron complexing agent being selected from hydrosoluble carboxylic acids with a complexing constant K such that the pK is at least 3 and the iron complex being selected from the products of reacting iron salts with said acids; then the precipitate obtained or a suspension containing said precipitate is brought into contact with an organic phase in the presence of an amphiphilic agent to obtain the dispersion in an organic phase. The dispersion of the invention can be used as a combustion additive in liquid fuel or motor fuel.

Organic colloidal dispersion of iron particles, method for preparing same and use thereof as fuel additive for internal combustion engines

A process for the combustion treatment of carbonaceous particles collected on a filter situated in an exhausted circuit of an internal combustion engine is disclosed. The combustion of the particles is brought about by contacting them with a gas mixture including at least nitrogen dioxide generated within the exhaust circuit of the engine, the particles having been seeded prior to their combustion with at least one catalyst of their oxidation.

Method for treating by combustion carbon-containing particles in an internal combustion engine exhaust circuit

The present invention relates to a composition based on cerium oxide or on cerium and zirconium oxides, in the extruded form, to a process for the preparation thereof and to the use thereof as catalyst. The process for the preparation of the composition of the invention is characterized in that a cerium hydroxide or oxyhydroxide or cerium and zirconium hydroxides or oxyhydroxides are extruded. The composition of the invention can be used as catalyst or catalyst support, in particular in the treatment of exhaust gases from internal combustion engines, in the process for the dehydrogenation of ethylbenzene to styrene, in the catalysis of methanation or in the treatment of a solution or suspension of organic compounds by oxidation via a wet route.

Composition based on cerium oxide or on cerium and zirconium oxides, in the extruded form, process for the preparation thereof and use thereof as catalyst

The present invention relates to a process for the treatment of exhaust gases from internal combustion engines operating with a fuel containing sulphur. This process is characterized in that use is made, as catalyst, of a composition based on a cerium oxide and on a zirconium oxide, in a cerium/zirconium atomic proportion of at least 1, and on at least one oxide chosen from yttrium, lanthanum and praseodymium oxide and which exhibits a specific surface, after calcination for 6 hours at 900 &deg; C., of at least 35 m /g.

Method for treating exhaust gas of internal combustion engines functioning with sulphur-containing fuel

A composition based on cerium oxide and on zirconium oxide and, optionally, on a yttrium, scandium or rare-earth metal oxide. The cerium/zirconium atomic proportion is at least 1. The compound exhibits a specific surface, after calcination for 6 hours at 900&deg; C. of at least 35 m,/g and an oxygen storage capacity at 400&deg; C. of at least 1.5 ml of O,/g. The composition is prepared by mixing, in a liquid medium, a cerium compound, a zirconium compound and, if appropriate, a yttrium, scandium or rare-earth metal compound; heating and calcining the precipitate obtained; and using a zirconium solution having an amount of base necessary to reach the equivalent point during an acid/base titration of the solution having a molar ratio of OH,/Zr&lE;1.65. The composition thus obtained is used in the manufacture of multi-functional catalysts.

Composition based on cerium oxide and on zirconium oxide with a high specific surface and a high oxygen storage capacity, process of preparation and use in catalysis

Composition based on zirconium oxide and cerium oxide, preparation method therefor and use thereof

Catalytic composition comprising a mixture of cerium oxide with

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Lagny le Sec, France

Gilbert Blanchard