Umicore Ag & Co Kg

Michiel De Prins

Johan Adriaan Martens

Frank-Walter Schuetze

Elke Jane June Verheyen

Sreeprasanth Pulinthanathu Sree

Stef Jules Peter Kerkhofs

Sam Smet

Frank-Walter Schütze

Andreas Jan Hoffmann

Leen Van Tendeloo

The present invention provides crystalline aluminosilicate zeolites having a maximum pore size of eight tetrahedral atoms, wherein the zeolite has a total proton content of less than 2 mmol per gram. The zeolite may comprise 0.1 to 10 wt.-% of at least one transition metal, calculated as the respective oxide and based on the total weight of the zeolite. It may furthermore comprise at least one alkali or alkaline earth metal in a concentration of 0 to 2 wt.-%, calculated as the respective metal and based on the total weight of the zeolite. The zeolites may be used for the removal of NOx from automotive combustion exhaust gases.

Stable small-pore zeolites

The present invention relates to crystalline aluminosilicate comprising a MOZ framework type material. The MOZ framework type material comprises between 0.1 and 12.5 wt-% of copper, calculated as CuO, and one or more alkali and alkaline earth metal cations in an amount of 0.3 to 9 wt.-%, calculated as pure metals. The process for making the copper containing MOZ type zeolites comprises a) preparing a first aqueous reaction mixture comprising a silica source and potassium hydroxide, b) preparing a second reaction mixture comprising an alumina source, potassium hydroxide and a structure-directing agent selected from N,N-1,4-dimethyl-1,4-diazabicyclo-[2.2.2]octane difluoride, dichloride, dibromide, diiodide or dihydroxide, c) combining the two aqueous reaction mixtures, d) aging the combined reaction mixtures, e) heating the combined reaction mixtures, e) recovering, washing and drying the zeolite obtained thereof, g) calcining the zeolite, f) introducing copper, and i) washing and drying the copper containing MOZ type zeolite. Furthermore, the present invention discloses a washcoat comprising the copper containing MOZ framework type material, an SCR catalyst comprising said copper containing MOZ framework type material, and an exhaust gas purification system containing said SCR catalyst.

Copper containing MOZ zeolite for selective NOx reduction catalysis

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Heverlee, Belgium

Michiel De Prins