Basf Corporation

Basf Se Corporation

Basf Mobile Emissions Catalysts LLC

Jeff H Yang

Stanley Allen Roth

Wen-Mei Xue

Kenneth Edwin Voss

Jaya L Mohanan

Ulrich Mueller

Andrei-Nicolae Parvulescu

Stefan Maurer

Sandip D Shah

Subramanian Prasad

Ulrich Müller

Ahmad Moini

Yuejin Li

Patrick L Burk

Olga Gerlach

Xiaofan Yang

Mathias Feyen

Barbara K Slawski

Manuela Gaab

Qi Fu

Georg Uhl

Roger Ruetz

Karsten Seidel

Haiyang Zhu

Stefan Dumser

Faruk Oezkirim

Faruk Özkirim

Hanpeng Jin

Ivan Petrovic

Robin M Huff

Sandip Shah

Ulrich MÜLLER

Hans-Jürgen Lützel

Ulrich Muller

The present disclosure relates to a process for preparing a catalyst for the selective catalytic reduction of nitrogen oxide. The process includes providing a zeolitic material comprising SiOand XOin its framework structure, wherein X is a trivalent element; subjecting the zeolitic material to an ion exchange procedure with one or more copper (II) containing compounds; preparing a slurry comprising the Cu ion-exchanged zeolitic material, one or more iron (II) and/or iron (III) containing compounds, and a solvent system; providing a substrate and coating the slurry onto the substrate; and calcining the coated substrate. Furthermore, the present disclosure relates to a catalyst for the selective catalytic reduction of nitrogen oxide, an exhaust gas treatment system for the treatment of exhaust gas exiting from an internal combustion engine, and a method for the selective catalytic reduction of nitrogen oxides.

Preparation of SCR catalyst comprising Cu and Fe-exchanged zeolite, said catalyst, system comprising said catalyst and exhaust gas treatment using such

The present disclosure provides catalyst compositions for NOx conversion and catalytic articles incorporating such catalyst compositions. Certain catalyst compositions include a zeolite with a silica-to-alumina ratio from 5 to 20 and sufficient Cu exchanged into cation sites of the zeolite such that the zeolite has a Cu/Al ratio of 0.1 to 0.5 and a CuO loading of 1 to 15 wt. %; and a copper trapping component in a concentration in the range of 1 to 20 wt. %, the copper trapping component including a plurality of particles having a particle size of about 0.5 to 20 microns. Certain catalyst compositions include, as the copper trapping component, alumina present as a plurality of alumina particles with a Dparticle size distribution in the range of 0.5 microns to 20 microns.

Catalytic washcoat with added alumina for NOx abatement

The present disclosure provides a method of forming a selective catalytic reduction (SCR) catalyst, the method including receiving a first iron-promoted zeolite having a first iron content, and treating the iron-promoted zeolite with additional iron in an ion exchange step to form a second iron-promoted zeolite with a second iron content, the second iron content being higher than the first iron content. A selective catalytic reduction (SCR) catalyst composition including an ironpromoted zeolite having at least about 6 weight percent iron, based on total weight of the ironpromoted zeolite, wherein the iron content of the zeolite was added to the zeolite in at least two separate steps is also provided herein.

Iron-promoted zeolite and catalyst made therefrom

The present disclosure relates to copper-containing molecular sieve catalysts that are highly suitable for the treatment of exhaust containing NOx pollutants. The copper-containing molecular sieve catalysts contain ion-exchanged copper as Cuand Cu(OH), and DRIFT spectroscopy of the catalyst exhibits perturbed T-O-T vibrational peaks corresponding to the Cuand Cu(OH). In spectra taken of the catalytic materials, a ratio of the Cuto the Cu(OH)peak integration areas preferably can be &#x2265;1. The copper-containing molecular sieve catalysts are aging stable such that the peak integration area percentage of the Cupeak (area Cu/(area Cu+area Cu(OH))) increases by &#x2264;20% upon aging at 800&#xb0; C. for 16 hours in the presence of 10% HO/air, compared to the fresh state.

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 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.

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 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

The present invention relates to a process for the preparation of a zeolitic material having a CHA-type framework structure comprising YOand XO, wherein said process comprises the steps of:

CHA type zeolitic materials and methods for their preparation using combinations of cycloalkyl-and tetraalkylammonium compounds

A process for the post-treatment of a zeolitic material having an MWW framework structure, the process comprising (i) providing a zeolitic material having an MWW framework structure, wherein the framework structure of the zeolitic material comprises XOand YO, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio XO:YOis greater than 0.02:1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio XO:YOof at most 0.02:1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75&#xb0; C.

Post-treatment of deboronated MWW zeolite

A process for the post-treatment of a zeolitic material, the process comprising (i) providing a zeolitic material, wherein the framework structure of the zeolitic material comprises YOand XO, wherein Y is a tetravalent element and X is a trivalent element; (ii) subjecting the zeolitic material provided in (i) to a method comprising (a) treating the zeolitic material with an aqueous solution having a pH of at most 5, (b) treating the zeolitic material obtained from (a) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75&#xb0; C.; wherein in (ii) and after (b), the zeolitic material is optionally subjected to at least one further treatment according to (a) and/or at least one further treatment according to (b).

Post-treatment of a zeolitic material

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Glen Rock, NJ, United States of America

Jeff H Yang