Rhodia Chimie

Rhone-Poulenc Chimie

Other

Faurecia Systemes D'echappement

Renault

Thierry Seguelong

Catherine Hedouin

Pierre Macaudiere

Philippe Barthe

Fabienne Pettini

Denis Huguenin

Gilbert Blanchard

Thierry Birchem

William Pierre Mustel

Christian Sarda

Marc Guyon

Najat Moral

Christophe Bouly

Thierry Pontier

Arno Fritz

Christian Bert

A composition for purifying exhaust gases of an internal combustion engine capable of consuming fuel with lean air-fuel ratios includes elements adsorbing the NOpresent in the exhaust gases, in the presence of excess oxygen and releasing the adsorbed NOwhen the oxygen concentration of the exhaust gases decreases. The NOadsorbing element includes in combination: a first composition comprising a support and an active phase, the active phase being based on manganese and at least another element A selected among, alkalines and alkaline-earths, the manganese and element A being chemically bound; a second composition including a support and an active phase based on manganese and at least another element B selected among alkalines, alkaline-earths and rare earths, the second composition having or being capable of having a specific surface area of at least 80 m/g after being calcined at 800&#xb0; C., and furthermore, a reducing and/or three-way catalyst function is incorporated in the NOadsorbing element.

Purifying composition with NOx treatment and internal combustion engine exhaust gases

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 invention relates to a process for the treatment of gases with high oxygen content, with a view to controlling nitrogen oxide emissions, characterized in that use is made of a catalytic composition comprising manganese oxide and at least one oxide chosen from cerium oxide and zirconium oxide. This composition may furthermore comprise at least one other element chosen from those in groups VIII, IB, IVB and VB. The process of the invention applies in particular to the treatment of exhaust gases of internal-combustion engines, more particularly diesel engines or lean-burn engines.

Process for the treatment of gases with high oxygen content, with a view to controlling nitrogen oxide emissions, using a catalytic composition comprising cerium oxide and/or zirconium oxide

The invention relates to compositions of the NOx trap type. According to a first embodiment, the composition comprises a supported phase containing manganese and at least one other element selected from terbium, gadolinium, europium, samarium, neodymium and praseodymium and a support based on cerium oxide or a mixture of cerium oxide and zirconium oxide. According to a second embodiment, the composition comprises a supported phase and a support of the same type as for the first embodiment, and is characterized in that the manganese and the potassium are supplied by potassium permanganate. According to another embodiment, the composition consists essentially of manganese and of cerium oxide. These compositions can be used in a gas treatment process with a view to reducing nitrogen oxide emissions.

Composition based on manganese and use for trapping NOx for treating exhaust gases

The present invention relates to a compound of the LaMO3 type, M being aluminum, gallium or indium, in the form of a powder or in sintered form, its process of preparation and its use as an oxygen conductor. The compound in powder form is capable of achieving, by pressureless sintering, a density of at least 93% of the theoretical density and of giving a sintered compound substantially free of any electrically active secondary phase of the grain boundaries. The compound in powder form is obtained by the reaction of the salts of lanthanum and of the element M with a base, and then the separation and calcining of the precipitate obtained. It may also be obtained by mixing, in a liquid medium, salts of lanthanum, and of the element M and, optionally, of a base, and then spray-drying and calcining the precipitate obtained. The sintered compound may be used in any application requiring an oxygen-conducting material in oxide form, such as solid-oxide fuel cells.

LaMO3 type composition, M being aluminium, gallium or indium, in powder or sintered form, method of preparation and use as conductor of oxygen

A composition is disclosed for reducing nitrogen oxide emissions from gases which comprises a support based on a cerium oxide, a zirconium oxide and an oxide of scandium or a rare earth other than cerium, and a supported phase based on manganese and at least one other element which is an alkali metal, alkaline-earth metal or a rare earth.

Support composition based on a cerium oxide, a zirconium oxide and a scandium or rare earth oxide and use for treating exhaust gas

The present invention is concerned with a titanium-, -and alkaline- or alkaline-earth-based compound, processes for the preparation thereof, and use thereof as a coloring pigment. The product of the invention is characterized in that it corresponds to formula (1) M,Ce,Ti,O,wherein M represents an alkaline or an alkaline-earth, and x, y and z satisfy the following equations: 0.1&lE;y/z&lE;1.5, 1&lE;(x&plus;z)/y&lE;15, x&plus;y&plus;z&equals;1, (x&plus;3y&equals;4z)/2&lE;t&lE;(x&plus;4y&plus;4z)/2. The product can be prepared by forming a mixture which comprises a titanium salt, sol or suspension, a compound of element M, and a cerium compound and then by drying and calcining the mixture, thus formed, according to a second variant, the compound is prepared by bringing together a cerium compound and a titanium compound in a liquid medium; by adding a base to the mixture thus obtained, whereby a precipitate is obtained; by bringing together a compound of element M and the precipitate thus obtained; by drying and then calcining the mixture obtained.

Titanium, cerium and alkaline or earth-alkaline based compound, preparation methods and use as colouring pigment

Oxygen-rich exhaust gases, for example those emanating from internal combustion engines, e.g., diesel engines, are catalytically treated/converted to reduce emissions of NO.sub.x, in the presence of a catalytically effective amount of a spinel mass oxide essentially having the formula ZnAl.sub.2 O.sub.4 which was prepared by forming a solution or suspension of the salts of the constituent elements of the mass oxide, drying by atomizing the solution or suspension and calcining the salts of the constituent elements of the mass oxide so as to result in the spinel mass oxide.

Spinel-based catalysts for reducing exhaust emissions of NO.sub.x

Oxygen-rich exhaust gases, for example those emanating from internal combustion engines, e.g., diesel engines, are catalytically treated/converted to reduce emissions of NO.sub.x, in the presence of a catalytically effective amount of either (a) a spinel mass oxide essentially having the formula ZnAl.sub.2 O.sub.4, or (b) a normal or inverse spinel oxide other than ZnAl.sub.2 O.sub.4, for example ZnGa.sub.2 O.sub.4, SnZnGa.sub.2 O.sub.4 or MgAl.sub.2 O.sub.4.

Colored/pigmented substrates, for example plastics, paints, varnishes, ceramics, glazes, papers, inks, cosmetics, dyes, binders, coatings, rubbers, etc., include an effective coloration-imparting amount of at least one colorant terbium compound having the formula ATbO.sub.3 and/or ATbMO.sub.3, wherein A is at least one alkaline earth metal and M is cerium, zirconium, praseodymium, or combination thereof.

Pigmented substrates comprising terbium compound colorants

Nontoxic yellow/orange pigment compositions, well suited for the coloration of a wide variety of substrates, for example paints, varnishes, plastics, ceramics, etc., comprise a major amount of a zirconium oxide and an additive amount of cerium, praseodymium and/or terbium values, such rare earth values being in the form of the oxides thereof.

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Puteaux, France

Thierry Seguelong