Basf Corporation

N.e. Chemcat Corporation

Heesung Catalysts Corporation

Heesung Cataysts Corporation

Basf Se Corporation

Basf Mobile Emissions Catalysts LLC

Jaya L Mohanan

Barbara K Slawski

Patrick L Burk

Michael Breen

Kenneth Edwin Voss

John K Hochmuth

Yasuyuki Banno

Eunseok Kim

Makoto Nagata

Qi Fu

Jeff H Yang

Subramanian Prasad

Sandip D Shah

Ulrich Müller

Ahmad Moini

Stanley Allen Roth

Wen-Mei Xue

Natalia Trukhan

Xiaofan Yang

Gary A Gramiccioni

Martin W Kraus

Martin C Wende

Ulrich Mueller

Martin Dieterle

Torsten Neubauer

Susanne Stiebels

Ivan Petrovic

Kevin A Hallstrom

Claudia Wendt

Weiyong Tang

Kenneth R Brown

Joseph J Petenko

Brian Todd Jones

Makato Nagata

Barbara Slawski

Kenneth E Voss

Sandip Shah

The present disclosure recognizes a correlation between zeolitic surface area (ZSA) of a catalyst composition and its catalytic activity. Particularly, the disclosure provides catalyst articles for diesel NOabatement, including a substrate and a washcoat layer containing metal-promoted molecular sieves, wherein the zeolitic surface area (ZSA) of the catalyst article is about 100 m/g or greater, the volumetric surface area is about 900 m/inor greater, and/or the total zeolitic surface area (tZSA) is about 1200 mor greater. The disclosure further relates to methods for evaluating ZSA, volumetric ZSA, and tZSA, e.g., including the steps of coating a catalyst composition comprising metal-promoted molecular sieves onto a substrate; calcining and aging the catalyst composition; determining the ZSA (or volumetric ZSA or tZSA) thereof; and correlating the ZSA (or volumetric ZSA or tZSA) with catalyst composition NOabatement activity to determine whether the catalyst composition is suitable for an intended use.

Catalytic washcoat with controlled porosity for NOabatement

Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low NO formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings containing copper-containing molecular sieves disposed thereon, where for example a concentration of catalytic copper in an upstream zone is lower than the concentration of catalytic copper in a downstream zone.

Selective catalytic reduction articles and systems

Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low NO formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings disposed thereon, for example, a zoned coating comprising an upstream zone comprising a coating layer comprising a steam-activated iron-containing molecular sieve and a downstream zone comprising a coating layer comprising a high copper-containing molecular sieve.

Described are exhaust gas treatment systems for treatment of an engine exhaust gas stream containing NOx. The exhaust gas treatment system comprises an engine, a catalyst system including a selective catalytic reduction article comprising two zones, an upstream zone comprising iron-promoted first molecular sieves and a downstream zone comprising copper-promoted second molecular sieves. The catalyst system is effective to reduce high NOx levels in the exhaust gas stream. Also described are methods for treatment of engine exhaust gas streams, comprising treating engine exhaust gas streams containing high NOx levels with catalyst systems including selective catalytic reduction articles having two zones.

Exhaust gas treatment system

Described are catalytic articles comprising a substrate having a washcoat on the substrate, the washcoat containing a catalytic component having a first average (D50) particle size and a functional binder component having a second average (D50) particle size in the range of about 10 nm to about 1000 nm, wherein the ratio of the first average (D50) particle size to the second average (D50) particle size is greater than about 10:1. The catalytic articles are useful in methods and systems to purify exhaust gas streams from an engine.

Nano-sized functional binder

Described are compositions and catalytic articles comprising both a first molecular sieve promoted with copper and a second molecular sieve promoted with iron, the first and second molecular sieves having a d6r unit and the first molecular sieves having cubic shaped crystals with an average crystal size of about 0.5 to about 2 microns. The weight ratio of the copper-promoted molecular sieve to the iron-promoted molecular sieve can be about 1:1 to about 4:1. The catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Mixed metal large crystal molecular sieve catalyst compositions, catalytic articles, systems and methods

Described is a selective catalytic reduction material comprising a spherical particle including an agglomeration of crystals of a molecular sieve. The catalyst is a crystalline material that is effective to catalyze the selective catalytic reduction of nitrogen oxides in the presence of a reductant at temperatures between 200&#xb0; C. and 600&#xb0; C. A method for selectively reducing nitrogen oxides and an exhaust gas treatment system are also described.

Molecular sieve catalyst compositions, catalyst composites, systems, and methods

Described is a catalyst composition suitable for use as a selective catalytic reduction catalyst, including small-pore molecular sieve particles having a pore structure and a maximum ring size of eight tetrahedral atoms and impregnated with a promoter metal, and metal oxide particles dispersed within the small-pore molecular sieve particles and external to the pore structure of the small-pore molecular sieve particles, wherein the metal oxide particles include one or more oxides of a transition metal or lanthanide of Group 3 or Group 4 of the Periodic Table. A method for preparing the catalyst, a method for selectively reducing nitrogen oxides, and an exhaust gas treatment system are also described.

Exhaust gas treatment catalyst

Described are catalyst materials and catalytic articles comprising a metal exchanged SAPO material comprising a plurality of substitutional sites consisting essentially of Si(4Al) sites and substantially free of Si(0Al) sites. The materials and catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Stabilized metal-exchanged SAPO material

Described are compositions and catalytic articles comprising both a copper-promoted 8-ring small pore molecular sieve and an iron-promoted 8-ring small pore molecular sieve. The catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

Mixed metal 8-ring small pore molecular sieve catalyst compositions, catalytic articles, systems, and methods

Described is a catalyst, preferably for use in selective catalytic reduction (SCR), said catalyst comprising one or more zeolites of the MFI structure type, and one or more zeolites of the CHA structure type, wherein at least part of the one or more zeolites of the MFI structure type contain iron (Fe), and wherein at least part of the one or more zeolites of the CHA structure type contain copper (Cu). An exhaust gas treatment system is described, comprising said catalyst as well as a process for the treatment of a gas stream comprising NOusing said catalyst as well.

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Described is a selective catalytic reduction catalyst comprising an iron-promoted 8-ring small pore molecular sieve. Systems and methods for using these iron-promoted 8-ring small molecular sieves as catalysts in a variety of processes such as abating pollutants in exhaust gases and conversion processes are also described.

8-ring small pore molecular sieve as high temperature SCR catalyst

Described are compositions and catalytic articles comprising a copper-promoted 8-ring small pore molecular sieve and an iron-promoted 8-ring small pore molecular sieve. The catalytic articles are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.

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Edison, NJ, United States of America

Jaya L Mohanan