CATALYTIC ARTICLE COMPRISING VANADIUM-BASED CATALYST AND MOLECULAR SIEVE-BASED CATALYST

CATALYTIC ARTICLE COMPRISING VANADIUM-BASED CATALYST AND MOLECULAR SIEVE-BASED CATALYST

The present invention relates to a catalytic article for purifying an exhaust gas containing nitrogen oxides, which comprises a first region containing a vanadium-based SCR catalyst, a second region containing a metal-promoted molecular sieve catalyst, and a third region containing a vanadium-based...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Beard, Kevin, Patchett, Joseph A, Becker, Jan Martin, Chen, Liang, Huennekes, Edgar Viktor, Lv, Shuxin, Kalwei, Martin, Zhang, Yu, Wu, Yijiang, Zhang, Jiadi
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
STEAM ENGINES
THEIR RELEVANT APPARATUS
TRANSPORTING
WEAPONS
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Beschreibung
Zusammenfassung:The present invention relates to a catalytic article for purifying an exhaust gas containing nitrogen oxides, which comprises a first region containing a vanadium-based SCR catalyst, a second region containing a metal-promoted molecular sieve catalyst, and a third region containing a vanadium-based SCR catalyst, wherein at least part of the second region is located downstream of at least part of the first region and upstream of at least part of the third region in the exhaust gas flow direction, provided that no part of the second region is located upstream of the first region or downstream of the third region. The present invention also relates to a method and a system for treatment of an exhaust gas containing nitrogen oxides by selective catalytic reduction using the catalytic article.