Johnson Matthey Public Limited Company

There is provided a catalyst article for treating an exhaust gas comprising NO<x>, the catalyst article comprising a catalyst composition disposed on a substrate, the catalyst composition comprising: a copper-loaded molecular sieve; and a binder comprising a titanium-doped aluminium hydroxide oxide and/or a titanium-doped alumina.

There is provided a catalyst article for treating an exhaust gas comprising NO<x>, the catalyst article comprising a catalyst composition disposed on a substrate, the catalyst composition comprising: a copper-loaded molecular sieve; and a binder comprising a cerium-doped aluminium hydroxide oxide and/or a cerium-doped alumina.

The present invention provides a catalyst article for the treatment of exhaust gas, the catalyst article comprising:a wall-flow filter substrate having porous walls and having a first face and a second face defining a longitudinal direction therebetween from an inlet end to an outlet end of the catalyst article and first and second pluralities of channels extending in the longitudinal direction, wherein the first plurality of channels is open at the first face and closed at the second face, and wherein the second plurality of channels is open at the second face and closed at the first face, wherein the first plurality of channels provide a first plurality of inner surfaces and wherein the second plurality of channels provide a second plurality of inner surfaces;a first coating disposed on the first plurality of inner surfaces and/or within the porous walls, and extending from the first face; anda second coating disposed on the second plurality of inner surfaces and/or within the porous walls, and extending from the second face;wherein the first coating comprises an Fe-loaded molecular sieve having an FER Framework Type and the second coating comprises a Cu-loaded molecular sieve having a CHA Framework Type and/or a Cu-loaded molecular sieve having an AEI Framework Type. The catalyst article is able to provide a good balance of high NO₂ conversion, high overall NO_x conversion and low NH₃ slip, while having good N₂O selectivity, at both low and high temperatures.

The present invention provides a method of manufacturing a catalyst article, the method comprising: providing a substrate;providing a washcoat slurry, the washcoat slurry comprising a solvent, a support material, platinum group metal (PGM) ions, e.g. palladium, barium ions and a chelating agent of formula (1);coating the substrate with the washcoat slurry to provide a coated substrate; andheating the coated substrate to calcine the washcoat slurry;wherein formula (1) is defined by:wherein R is CH₂OH, COOH orwherein R' is CH₂OH or COOH.

The present invention provides an all-active, extruded selective catalytic reduction (SCR) catalyst, comprising a metal-loaded zeolite and a binder in the form of silica-alumina, wherein the silica content of the silica-alumina is in the range of about 1% to 20% by weight. The invention further provides a method of preparing such an SCR catalyst comprising (a) forming a plastic mixture having a solids content of greater than 50 % by weight by mixing together a metal-loaded zeolite or a zeolite in an H+ or NH4+ form and an active metal precursor; an inorganic matrix component comprising silica-containing boehmite, wherein the silica content of the silica-boehmite is in the range about 1% to 20% by weight; an organic auxiliary agent, an aqueous solvent and optionally inorganic fibres; (b) moulding the plastic mixture into a shaped article; and (c) calcining the shaped article to form a solid catalyst body.

The present invention provides a selective catalytic reduction (SCR) catalyst, for treating a gas mixture comprising NOx, the SCR catalyst comprising 50 to 90 wt% of a metal loaded zeolite and > 5 to 35 wt% of a binder in the form of titanium dioxide or silica-stabilised titanium dioxide.

This invention relates to a method for making a selective catalytic reduction catalyst, a catalyst article made according to the method and the use of the catalyst article in the selective catalytic reduction of NO<x>. The invention specifically relates to a method for producing a catalyst for the selective catalytic reduction of NO<x> in a gas mixture, the method comprising the steps of preparing a slurry comprising vanadium (V), antimony (Sb) and a reactive media, such as a hydrogen peroxide solution, to form a colloidal sol of VSbO<4>; combining the colloidal sol of VSbO<4> with a catalyst support material, such as titania, to form a mixture; and optionally drying and calcining the resulting mixture.

A catalytic article for treating exhaust gas from gasoline engines comprising: a substrate comprising an inlet end and an outlet end with an axial length L, a first catalytic region comprising a first platinum group metal (PGM) component and a first metal component, wherein the first PGM component is platinum or palladium; wherein the first metal component is Fe; wherein when the first PGM component is platinum, the molar ratio between the first metal component and the first PGM component in the first catalytic region is from 35:1 to 8:1; wherein when the first PGM component is palladium, the molar ratio between the first metal component and the first PGM component in the first catalytic region is from 10:1 to 1:5; and wherein the first catalytic region further comprises a first oxygen storage capacity (OSC) material and a first inorganic oxide. The invention also relates to a catalytic article comprising a first catalytic region comprising Fe and Pd, wherein the molar ratio of Fe to Pd is 120:1 to 1:5. The invention also relates to a catalytic article comprising a first catalytic region comprising no more than 2wt.% of Zn based on element.

A method of quantifying a content of an insoluble metal compound in an aqueous suspension comprising an insoluble metal compound and a metal ion-exchanged molecular sieve is disclosed, The method comprises: treating the aqueous suspension of the insoluble metal compound and the metal ion-exchanged molecular sieve with a selective solubilising agent for the insoluble metal compound, thus producing a treated mixture comprising a metal solution comprising a dissolved metal from the insoluble metal compound and undissolved metal ion-exchanged molecular sieve; and quantifying a dissolved metal content of the treated mixture using a suitable analytical technique.

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