DE102008009672A1 - SCR catalyst with hydrocarbon storage function and catalyst arrangement - Google Patents
SCR catalyst with hydrocarbon storage function and catalyst arrangement Download PDFInfo
- Publication number
- DE102008009672A1 DE102008009672A1 DE102008009672A DE102008009672A DE102008009672A1 DE 102008009672 A1 DE102008009672 A1 DE 102008009672A1 DE 102008009672 A DE102008009672 A DE 102008009672A DE 102008009672 A DE102008009672 A DE 102008009672A DE 102008009672 A1 DE102008009672 A1 DE 102008009672A1
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- Germany
- Prior art keywords
- catalyst
- scr
- scr catalyst
- exhaust gas
- hydrocarbon storage
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims abstract description 151
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 37
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 37
- 238000003860 storage Methods 0.000 title claims abstract description 28
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 23
- 229910021536 Zeolite Inorganic materials 0.000 claims description 22
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- 238000000746 purification Methods 0.000 claims description 16
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- 238000002485 combustion reaction Methods 0.000 claims description 11
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- 230000007062 hydrolysis Effects 0.000 claims description 6
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Classifications
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B01D53/9436—Ammonia
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- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
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- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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Abstract
Die vorliegende Erfindung betrifft einen SCR-Katalysator, welcher eine SCR-aktive Komponente und eine Kohlenwasserstoffspeicherkomponente in einem Bauteil vereint. Die Erfindung betrifft ferner eine Katalysatoranordnung, welche den erfindungsgemäßen SCR-Katalysator enthält.The present invention relates to an SCR catalyst which combines an SCR active component and a hydrocarbon storage component in one component. The invention further relates to a catalyst arrangement which contains the SCR catalyst according to the invention.
Description
Die vorliegende Erfindung betrifft einen SCR-Katalysator, welcher eine SCR-aktive Komponenten und eine Kohlenwasserstoffspeicherkomponente in einem Bauteil vereint. Die Erfindung betrifft ferner eine Katalysatoranordnung, welche den erfindungsgemäßen SCR-Katalysator umfasst.The The present invention relates to an SCR catalyst comprising a SCR-active components and a hydrocarbon storage component united in one component. The invention further relates to a catalyst arrangement, which comprises the inventive SCR catalyst.
Ein Abgassystem für Dieselverbrennungsmotoren besteht in der Regel aus den folgenden Komponenten:
- • DOC zur Oxidation von Kohlenwasserstoffen und als Kohlenwasserstoffspeicher im Kaltstart;
- • DPF zur Verminderung der Partikelemissionen;
- • optional ein H-Katalysator zur Harnstoffaufbereitung;
- • SCR-Katalysator zur Reduktion der Stickoxide;
- • Sperrkatalysator als Ammoniak-Oxidationskatalysator.
- • DOC for the oxidation of hydrocarbons and as hydrocarbon storage in cold start;
- • DPF to reduce particulate emissions;
- • optional H catalyst for urea processing;
- • SCR catalyst for the reduction of nitrogen oxides;
- • Blocking catalyst as ammonia oxidation catalyst.
Unter DOC (Diesel-Oxidationskatalysator) versteht der Fachmann einen Katalysator, welcher einerseits im Kaltstart eine Kohlenwasserstoff-Speicherfunktion erfüllt und im Normalbetrieb unverbrannte Kohlenwasserstoffe oxidiert. Die Behandlung der Abgase von Dieselverbrennungsmotoren mit Katalysatoren erfordert konzeptionelle Änderungen an den Katalysatormaterialien, da ein Dieselmotor im Gegensatz zu einem Benzinmotor immer unter Sauerstoffüberschuss betrieben wird und der Katalysator somit nie reduktiven Bedingungen ausgesetzt ist.Under DOC (Diesel Oxidation Catalyst), the skilled person understands a catalyst, which on the one hand in the cold start a hydrocarbon storage function fulfilled and in normal operation unburned hydrocarbons oxidized. The treatment of the exhaust gases of diesel internal combustion engines with Catalysts requires conceptual changes to the Catalyst materials, as a diesel engine as opposed to a Gasoline engine always operated under excess oxygen and the catalyst is thus never exposed to reductive conditions.
Partikelfilter (DPF, Dieselpartikelfilter) werden eingesetzt, um Rußpartikel aus dem Abgas von Verbrennungsmotoren, speziell Dieselmotoren, herauszufiltern und so deren Ausstoß in die Atmosphäre zu vermindern. Dabei kommen verschiedene Filterkonzepte, wie z. B. so genannte „Wall-flow-Filter" oder Filter aus keramischen oder metallischen Schäumen zur Anwendung. Die eigentliche Schwierigkeit besteht aber nicht in der Filtration der Rußpartikel, sondern in der Regeneration der eingesetzten Filter. Kohlenstoffruß verbrennt je nach betriebsbedingter Zusammensetzung der Partikel spontan erst bei Temperaturen zwischen 500°C und 700°C. Diese Temperaturen werden aber z. B. von modernen Dieselmotoren im Allgemeinen nur bei Volllast erreicht.particulate Filter (DPF, diesel particulate filter) are used to soot particles from the exhaust of internal combustion engines, especially diesel engines, filter out and so reduce their emissions to the atmosphere. Here are various filter concepts, such. B. so-called "wall-flow filter" or Filters made of ceramic or metallic foams for use. The real difficulty is not in the filtration the soot particles, but in the regeneration of the filters used. Carbon soot burns depending on the operational composition the particles spontaneously only at temperatures between 500 ° C. and 700 ° C. These temperatures are but z. B. of modern Diesel engines generally only reached at full load.
Daher sind zusätzliche unterstützende Maßnahmen, beispielsweise zur Oxidation der aus dem Abgas abgetrennten Rußpartikel, notwendig. Dies kann durch Zusatz von Additiven oder durch eine katalytische Beschichtung der Filter oder Katalysatoren geschehen. Aus dem Stand der Technik sind Abgasreinigungskatalysatoren mit einer hohen Oxidationswirkung bekannt, so dass die Partikel bei einer tiefen Temperatur verbrannt werden können. Die Oberfläche der Filterkammer weist deshalb oft eine katalytisch aktive Beschichtung zur Beschleunigung der Verbrennung der auf dem Filter gesammelten Rußpartikel auf. Die katalytisch aktive Beschichtung oxidiert das im Abgas enthaltene Stickstoffmonoxid zu Stickstoffdioxid. Das entstandene Stickstoffdioxid verbessert dann die Oxidation der abgelagerten Partikel.Therefore are additional supportive measures, For example, for the oxidation of the separated from the exhaust soot particles, necessary. This can be done by adding additives or by a catalytic coating of the filters or catalysts happen. From the prior art are exhaust gas purification catalysts with a high oxidation effect, so that the particles in a low temperature can be burned. The surface The filter chamber therefore often has a catalytically active coating to speed up the combustion of the collected on the filter Soot particles on. The catalytically active coating oxidizes the nitrogen monoxide contained in the exhaust gas to nitrogen dioxide. The resulting nitrogen dioxide then improves the oxidation of the deposited Particle.
Mit SCR (selective catalytic reduction) wird die selektive katalytische Reduktion von Stickoxiden aus Abgasen von Verbrennungsmotoren (und auch Kraftwerken) bezeichnet. Mit einem SCR-Katalysator werden nur die Stickoxide NO und NO2 selektiv redu ziert, wobei für die Reaktion gewöhnlich NH3 (Ammoniak) zugemischt wird. Als Reaktionsprodukt entstehen nur die unbedenklichen Stoffe Wasser und Stickstoff. Für den Einsatz in Kraftfahrzeugen ist das Mitführen von Ammoniak in Druckgasflaschen ein Sicherheitsrisiko. Deshalb werden gewöhnlich Vorläuferverbindungen des Ammoniaks eingesetzt, die im Abgasstrang der Fahrzeuge unter Ammoniakbildung zersetzt werden. Bekannt in diesem Zusammenhang ist beispielsweise die Verwendung von AdBlue®, welches eine etwa 32,5%-ige eutektische Lösung von Harnstoff in Wasser ist. Andere Ammoniakquellen sind beispielsweise Ammoniumcarbamat, Ammoniumformiat oder Harnstoffpellets. Oftmals wird deshalb auch noch ein Hydrolysekatalysator (H-Kat) eingesetzt, welcher aus den Vorläufersubstanzen NH3 generiert.Selective catalytic reduction (SCR) refers to the selective catalytic reduction of nitrogen oxides from exhaust gases of combustion engines (and also power plants). With an SCR catalyst, only the nitrogen oxides NO and NO 2 are selectively reduced, with NH 3 (ammonia) usually being mixed in for the reaction. The reaction product is only the harmless substances water and nitrogen. For use in motor vehicles, carrying ammonia in pressurized gas cylinders poses a safety risk. Therefore, precursor compounds of ammonia are usually used, which are decomposed in the exhaust line of the vehicles with formation of ammonia. Known in this context is, for example, the use of AdBlue® , which is an approximately 32.5% eutectic solution of urea in water. Other sources of ammonia include ammonium carbamate, ammonium formate or urea pellets. Often therefore also a hydrolysis catalyst (H-Cat) is used, which generates from the precursors NH 3 .
Vor der eigentlichen SCR-Reaktion muss aus Harnstoff zunächst Ammoniak gebildet werden. Dies geschieht in zwei Reaktionsschritten, die zusammengefasst als Hydrolysereaktion bezeichnet werden. Zunächst werden in einer Thermolysereaktion NH3 und Isocyansäure gebildet. Anschließend wird in der eigentlichen Hydrolysereaktion Isocyansäure mit Wasser zu Ammoniak und Kohlendioxid umgesetzt.Before the actual SCR reaction, ammonia must first be formed from urea. This is done in two reaction steps, collectively referred to as the hydrolysis reaction. First, NH 3 and isocyanic acid are formed in a thermolysis reaction. Isocyanic acid is then reacted with water to form ammonia and carbon dioxide in the actual hydrolysis reaction.
Zur Vermeidung von festen Ausscheidungen ist es erforderlich, dass die zweite Reaktion durch die Wahl geeigneter Katalysatoren und genügend hoher Temperaturen (ab 250°C) ausreichend schnell erfolgt. Moderne SCR-Reaktoren übernehmen gleichzeitig die Funktion des Hydrolysekatalysators.to Avoiding solid precipitates requires that the second reaction by choosing suitable catalysts and enough high temperatures (from 250 ° C) sufficiently fast. Modern SCR reactors take over the function at the same time the hydrolysis catalyst.
Das
durch die Thermohydrolyse entstandene Ammoniak reagiert am SCR-Katalysator
nach den folgenden Gleichungen:
Bei
niedrigen Temperaturen (< 300°C)
läuft der Umsatz überwiegend über Reaktion
(
Die Oxidation von NO zu NOx erfolgt in einem vorgelagerten Oxidationskatalysator der für einen optimalen Wirkungsgrad erforderlich ist.The oxidation of NO to NO x takes place in an upstream oxidation catalyst which is required for optimum efficiency.
Wird mehr Reduktionsmittel dosiert, als bei der Reduktion mit NOx umgesetzt wird, so kann es zu einem unerwünschten NH3-Schlupf kommen. Die Entfernung des NH3 kann durch einen zusätzlichen Oxidationskatalysator hinter dem SCR-Katalysator erzielt werden. Dieser Sperrkatalysator oxidiert das gegebenenfalls auftretende Ammoniak zu N2 und H2O. Darüber hinaus ist eine sorgfältige Applikation der Harnstoffdosierung unerlässlich.If more reducing agent is metered than is reacted during the reduction with NO x , it can lead to an undesirable NH 3 slip. The removal of the NH 3 can be achieved by an additional oxidation catalyst downstream of the SCR catalyst. This barrier catalyst oxidizes the possibly occurring ammonia to N 2 and H 2 O. In addition, careful application of the urea dosage is essential.
Eine
für die SCR-Katalyse wichtige Kenngröße
ist das so genannte Feedverhältnis α, definiert
als das molare Verhältnis von zudosiertem NH3 zu
dem im Abgas vorhandenen NOx. Bei idealen
Betriebsbedingungen (kein NH3-Schlupf, keine
Nebenreaktionen, keine NH3-Oxidation) ist α direkt
proportional zur NOx-Reduktionsrate:
Bei α =
1 wird theoretisch eine einprozentige NOx-Reduktion
erreicht. Im praktischen Einsatz kann bei einem NH3-Schlupf
von < 20 ppm eine
NOx-Reduktion von 90% im stationären
und instationären Betrieb erzielt werden.An important parameter for SCR catalysis is the so-called feed ratio α, defined as the molar ratio of metered NH 3 to the NO x present in the exhaust gas. Under ideal operating conditions (no NH 3 slip, no side reactions, no NH 3 oxidation), α is directly proportional to the NO x reduction rate:
At α = 1 theoretically a one percent NO x reduction is achieved. In practical use, with NH 3 slip of <20 ppm, a NO x reduction of 90% in stationary and transient operation can be achieved.
Durch die vorgelagerte Hydrolysereaktion wird bei den heutigen SCR-Katalysatoren ein NOx-Umsatz > 50% erst bei Temperaturen oberhalb von ca. 250°C erreicht, optimale Umsatzraten werden im Temperaturfenster von 250–450°C erzielt.Due to the upstream hydrolysis reaction, in today's SCR catalysts an NO x conversion> 50% is achieved only at temperatures above about 250 ° C, optimum conversion rates are achieved in the temperature window of 250-450 ° C.
Die Dosierstrategie ist bei Katalysatoren mit hohem NH3-Speichervermögen von großer Wichtigkeit, da die NH3-Speicherfähigkeit von SCR-Katalysatoren des Standes der Technik typischerweise mit steigender Temperatur abnimmt.The dosing strategy is of great importance in high NH 3 storage capacity catalysts because the NH 3 storage capability of prior art SCR catalysts typically decreases with increasing temperature.
Derzeit werden sowohl im Kraftwerksbereich als auch im Automobilbereich überwiegend SCR-Katalysatoren auf Basis von Titandioxid, Vanadiumpentaoxid und Wolframoxid eingesetzt. Auch ist die Verwendung von SCR-Katalysatoren auf Basis von Zeolithen im Stand der Technik bekannt. In diesem Fall fungiert der Zeolith jedoch lediglich als SCR-aktive Komponente.Currently become predominant both in the power station sector and in the automotive sector SCR catalysts based on titanium dioxide, vanadium pentaoxide and Tungsten oxide used. Also, is the use of SCR catalysts based on zeolites known in the art. In this However, the zeolite only acts as an SCR-active component.
Ferner wird gemäß Stand der Technik häufig ein Ammoniak-Sperrkatalysator verwendet, welcher überschüssiges Ammoniak aus dem SCR-Katalysator oxidiert, da Ammoniak sehr schädlich für die Gesundheit und die Umwelt ist.Further becomes common in the art Ammonia trap catalyst uses which excess Ammonia from the SCR catalyst oxidizes because ammonia is very harmful for the health and the environment.
Wie zu erkennen ist, umfasst ein modernes Abgassystem eine Vielzahl von Komponenten welche gewöhnlich am Fahrzeugboden im Abgasstrang integriert sind. Da dort der zur Verfügung stehende Raum begrenzt ist, wäre es somit wünschenswert, wenn der zur Verfügung stehende Raum effektiver genutzt werden könnte.As can be seen, a modern exhaust system includes a variety of components which usually integrated on the vehicle floor in the exhaust system are. Because there is limited space available it would be desirable if the Available space could be used more effectively.
Die Aufgabe der vorliegenden Erfindung bestand somit darin, ein Katalysator- bzw. Abgassystem bereit zu stellen, das einen reduzierten Raumbedarf aufweist.The The object of the present invention was thus to provide a catalyst or exhaust system to provide that a reduced space requirement having.
Die Aufgabe wird gelöst durch einen SCR-Katalysator, welcher eine SCR-aktive Komponente und eine Kohlenwasserstoffspeicherkomponente umfasst.The Task is solved by an SCR catalyst, which an SCR active component and a hydrocarbon storage component includes.
Die Aufgabe wird ferner gelöst durch ein Abgasreinigungssystem welches
- • einen Rußpartikelfilter (DPF),
- • einen SCR-Katalysator, und
- • einen Oxidationskatalysator umfasst
- A soot particle filter (DPF),
- • an SCR catalyst, and
- • comprises an oxidation catalyst
Überaschend konnte gefunden werden, dass mehrere Katalysatorfunktionen in einzelnen Katalysatorbauteilen kombiniert werden können, wodurch eine enorme Verringerung des Raumbedarfs resultiert.About Aschend could be found that several catalyst functions in individual Catalyst components can be combined, creating a enormous reduction in space requirements results.
Bevorzugt liegen die SCR-aktive Komponente und die Kohlenwasserstoffspeicherkomponente als Beschichtung auf einem Katalysatorträger vor. Geeignete Katalysatorträger können metallische oder keramische Träger sein. Bevorzugt ist der Katalysatorträger ein monolithischer Träger.Prefers For example, the SCR active component and the hydrocarbon storage component are considered Coating on a catalyst support before. suitable Catalyst supports can be metallic or ceramic Be carrier. The catalyst support is preferred a monolithic carrier.
Der erfindungsgemäße SCR-Katalysator umfasst eine Kohlenwasserstoffspeicherkomponente, welche vorzugsweise eine Zeolithkomponente ist. Die Kohlenwasserstoffspeicherkomponente kann einen Zeolithen in der H-Form oder einen metallausgetauschten Zeolithen umfassen. Die Herstellungsverfahren für metallausgetauschte Zeolithe, beispielsweise über Fest- oder Flüssigphasenaustausch, sowie für Zeolithe in der H-Form sind dem Fachmann bekannt.Of the SCR catalyst according to the invention comprises a Hydrocarbon storage component, which is preferably a zeolite component is. The hydrocarbon storage component may be a zeolite in H-form or a metal-exchanged zeolite. The production processes for metal-exchanged zeolites, for example via solid or liquid phase exchange, and for zeolites in the H form are known in the art.
Metallausgetauschte Zeolithe haben ferner den Vorteil, dass diese bi-funktionell sind, d. h. dass sie sowohl eine SCR-Aktivität als auch eine Kohlenwasserstoffspeicheraktivität besitzen.Metal Exchanged Zeolites also have the advantage of being bi-functional, d. H. that they have both an SCR activity and a Possess hydrocarbon storage activity.
Die SCR-aktive Komponente umfasst weiterhin vorzugsweise einen Katalysator auf Basis von Vanadium, Wolfram, Titan und/oder einen Fe-Zeolith.The SCR-active component preferably further comprises a catalyst based on vanadium, tungsten, titanium and / or an Fe zeolite.
Geeignete Zeolithe sind ausgewählt aus der Gruppe umfassend AEL, BEA, CHA, EUO, FAO, FER, KFI, LTA, LTL, MAZ, MOR, MEL, MTW, LEV, OFF, TON und MFI.suitable Zeolites are selected from the group comprising AEL, BEA, CHA, EUO, FAO, FER, KFI, LTA, LTL, MAZ, MOR, MEL, MTW, LEV, OFF, TONE and MFI.
Unter
dem Begriff „Zeolith" wird im Rahmen der vorliegenden Erfindung
gemäß der Definition der International Mineralical
Association (
Das Verhältnis von Si/Al = y/x beträgt immer > 1 gemäß der sog. „Löwenstein-Regel", die das benachbarte Auftreten zweier benachbarter negativ geladener AlO4-Tetraeder verbietet. Dabei stehen bei einem geringen Si/Al-Verhältnis zwar mehr Austauschplätze für Metall zur Verfügung, der Zeolith wird jedoch zunehmend thermisch instabiler.The ratio of Si / Al = y / x is always> 1 according to the so-called "Löwenstein rule", which prohibits the adjacent occurrence of two adjacent negatively charged AlO 4 tetrahedra, although there are more at a low Si / Al ratio Exchange places for metal are available, however, the zeolite becomes increasingly thermally unstable.
Die Zeolithstruktur enthält Hohlräume, Kanäle, die für jeden Zeolithen charakteristisch sind. Die Zeolithe werden gemäß ihrer Topologie in verschiedene Strukturen eingeteilt. Das Zeolithgerüst enthält offene Hohlräume in Form von Kanälen und Käfigen, die normalerweise mit Wassermolekülen und zusätzlichen Gerüstkationen besetzt sind, die ausgetauscht werden können. Auf ein Aluminiumatom kommt eine überschüssige negative Ladung, die durch diese Kationen kompensiert wird. Das Innere des Porensystems stellt die katalytisch aktive Oberfläche dar. Je mehr Aluminium und je weniger Silizium ein Zeolith enthält, desto dichter ist die negative Ladung in seinem Gitter und desto polarer seine innere Oberfläche. Die Porengröße und Struktur wird neben den Parametern bei der Herstellung, d. h. Verwendung bzw. Art von Templaten, pH, Druck, Temperatur, Anwesenheit von Impfkristallen, durch das Si/Al-Verhältnis bestimmt, das den größten Teil des katalytischen Charakters eines Zeolithen ausmacht.The Zeolite structure contains cavities, channels, which are characteristic of each zeolite. The zeolites become different structures according to their topology assigned. The zeolite framework contains open cavities in the form of canals and cages that normally with water molecules and additional framework cations are busy, which can be exchanged. On an aluminum atom comes an excess negative charge that is compensated by these cations. The interior of the pore system represents the catalytically active surface. The more aluminum and the less silicon a zeolite contains, the denser is the negative charge in its lattice and the more polar its inner surface. The pore size and Structure is in addition to the parameters in the production, d. H. Use or Type of templates, pH, pressure, temperature, presence of seed crystals, determined by the Si / Al ratio, which is the largest Part of the catalytic character of a zeolite.
Durch Anwesenheit von zwei- oder dreiwertigen Kationen als Tetraederzentrum im Zeolithgerüst erhält der Zeolith eine negative Ladung in Form von sog. Anionenstellen, in deren Nachbarschaft sich die entsprechenden Kationenpositionen befinden. Die negative Ladung wird durch den Einbau von Kationen in die Poren des Zeolithmaterials kompensiert. Die Zeolithe unterscheidet man hauptsächlich nach der Geometrie der Hohlräume, die durch das starre Netzwerk der SiO4/AlO4-Tetraeder gebildet werden. Die Eingänge zu den Hohlräumen werden von 8, 10 oder 12 Ringen gebildet, der Fachmann spricht hier von eng-, mittel- und weitporigen Zeolithen. Bestimmte Zeolithe zeigen einen gleichförmigen Strukturaufbau, z. B. die ZSM-5- oder die MFI-Topologie, mit linearen oder zickzack-förmig verlaufenden Kanälen, bei anderen schließen sich hinter den Porenöffnungen größere Hohlräume an, z. B. bei den Y- oder A-Zeolithen, mit den Topologien FAO und LTA.The presence of divalent or trivalent cations as a tetrahedral center in the zeolite framework gives the zeolite a negative charge in the form of so-called anion sites, in the vicinity of which the corresponding cation positions are located. The negative charge is compensated by the incorporation of cations in the pores of the zeolite material. The zeolites are mainly distinguished by the geometry of the cavities formed by the rigid network of SiO 4 / AlO 4 tetrahedra. The entrances to the cavities are formed by 8, 10 or 12 rings, the expert speaks here of narrow, medium and large pore zeolites. Certain zeolites show a uniform structure structure, e.g. For example, the ZSM-5 or the MFI topology, with linear or zigzag-shaped channels, in others close behind the pore openings larger cavities, z. As in the Y or A zeolites, with the topologies FAO and LTA.
Vorzugsweise befindet sich das Zeolithmaterial der Kohlenwasserstoffspeicherkomponente an der Katalysatoreintrittsseite. Dies hat den Vorteil, dass der Katalysator damit auch die Funktion eines H-Katalysators (Hydrolyse-Katalysator) übernehmen kann, da Zeolithe auch als gute Hydrolyse-Katalysatoren bekannt sind. Dadurch kann eine weitere Katalysatorfunktion in den SCR-Katalysator integriert werden, wodurch die Notwendigkeit eines optionalen Hydrolyse-Katalysators entfällt.Preferably is the zeolite material of the hydrocarbon storage component at the catalyst inlet side. This has the advantage that the Catalyst so that it can also take over the function of an H-catalyst (hydrolysis catalyst), since zeolites are also known as good hydrolysis catalysts. This can be another catalyst function in the SCR catalyst be integrated, eliminating the need for an optional hydrolysis catalyst eliminated.
Gemäß der Anordnung des erfindungsgemäßen Abgasreinigungssystems soll der SCR-Katalysator zwischen dem Rußpartikelfilter (DPF) und dem Oxidationskatalysator angeordnet sein. In dieser Anordnung stellt der Oxidationskatalysator ein eigenes Bauteil dar.According to the Arrangement of the emission control system according to the invention should the SCR catalyst between the soot particle filter (DPF) and the oxidation catalyst. In this arrangement represents the oxidation catalyst is a separate component.
Gemäß einer weiteren bevorzugten Anordnung des erfindungsgemäßen Abgasreinigungssystems soll der Oxidationskatalysator ein Bestandteil des SCR-Katalysators sein. Dazu ist es bevorzugt, dass der Oxidationskatalysator als Beschichtung auf dem Katalysatorträger des SCR-Katalysators vorliegt. Die Beschichtung befindet sich bevorzugt an der Austrittsseite des SCR-Katalysators. Es ist ferner bevorzugt, dass etwa 15–25%, besonders bevorzugt etwa 20% der Fläche des SCR-Katalysators mit dem Oxidationskatalysator beschichtet ist.According to one Another preferred arrangement of the invention The exhaust gas purification system is said to be part of the oxidation catalyst Be SCR catalyst. For this purpose, it is preferred that the oxidation catalyst as a coating on the catalyst support of the SCR catalyst is present. The coating is preferably located on the exit side of the SCR catalyst. It is further preferred that about 15-25%, most preferably about 20% of the area of the SCR catalyst coated with the oxidation catalyst.
Der Oxidationskatalysator am Ende des Abgassystems übernimmt zwei Aufgaben. Zum einen die Oxidation der unverbrannten Kohlenwasserstoffe (HC) und Kohlemonoxide (CO) und zum anderen die Oxidation von NH3, der nicht bei der SCR-Reaktion umgesetzt wurde (NH3-Schlupf). Die unverbrannten Kohlenwasserstoffe der Kaltstartphase werden bei erhöhter Temperatur desorbiert und treffen dann auf den Oxidationskatalysator und werden zu CO2 umgesetzt. Durch diese Kombination kann der Ammoniak- Sperrkatalysator in den Oxidationskatalysator integriert werden, was wiederum eine Raumeinsparung mit sich bringt.The oxidation catalyst at the end of the exhaust system performs two tasks. On the one hand, the oxidation of the unburned hydrocarbons (HC) and carbon monoxide (CO) and on the other the oxidation of NH 3 , which was not implemented in the SCR reaction (NH 3 -slip). The unburned hydrocarbons of the cold start phase are desorbed at elevated temperature and then hit the oxidation catalyst and are converted to CO 2 . By this combination, the ammonia barrier catalyst can be integrated into the oxidation catalyst, which in turn brings a space saving.
Bevorzugt im Sinne dieser Erfindung sind der DPF, der SCR-Katalysator und der Oxidationskatalysator als Beschichtungskatalysator ausgebildet. Allgemein können Katalysatoren in Vollkatalysatoren und Beschichtungskatalysatoren eingeteilt werden. Während Vollkatalysatoren zu über 50% aus einem katalytisch aktiven Material bestehen, bestehen Beschichtungskatalysatoren aus einem Katalysatorträgerkörper, der aus einem Metall oder einer Keramik bestehen kann, wobei die Oberfläche des Katalysatorträgerkörpers mit einer Beschichtung versehen ist. Die Beschichtung wird mittels einer sog. Washcoat-Suspension, d. h. einer Aufschlämmung in einem fluiden Medium auf den Katalysatorträger aufgetragen. Gewöhnlich wird anschließend die aufgetragene Washcoat-Suspension getrocknet und kalziniert. Die Beschichtung kann anschließend mit einer weiteren katalytisch aktiven Komponente imprägniert werden, wobei die aktiven Komponenten auch in der Washcoat-Suspension gelöst sein können oder zuvor auf den Metalloxidpartikeln aufgebracht worden sein. Der Vorteil von Beschichtungskatalysatoren besteht in der einfachen Herstellung, die mit einem geringen verfahrenstechnischen Aufwand verbunden ist. In Abgasreinigungsanlagen können mehrere einzelne Katalysatoren durch Parallelschaltung zu großen Katalysatoren kombiniert werden. Ein weiterer Vorteil von Beschichtungskatalysatoren ist, dass geringere Mengen an teuren Aktivkomponenten erforderlich sind.For the purposes of this invention, the DPF, the SCR catalyst and the oxidation catalyst are in the form of a coating catalyst. In general, catalysts can be classified as full catalysts and coating catalysts. While full catalysts consist of more than 50% of a catalytically active material, Be coating catalysts of a catalyst carrier body, which may consist of a metal or a ceramic, wherein the surface of the catalyst carrier body is provided with a coating. The coating is applied to the catalyst support by means of a so-called washcoat suspension, ie a slurry in a fluid medium. Usually, the applied washcoat suspension is then dried and calcined. The coating can then be impregnated with a further catalytically active component, wherein the active components may also be dissolved in the washcoat suspension or have been previously applied to the metal oxide particles. The advantage of coating catalysts is the ease of production, which is associated with a low procedural effort. In emission control systems, several individual catalysts can be combined by parallel connection to large catalysts. Another advantage of coating catalysts is that smaller amounts of expensive active components are required.
In einer bevorzugten Ausführungsform umfasst die Beschichtung des Beschichtungskatalysators (SCR und/oder Oxidationskatalysator) einen mit Eisen dotierten Zeolithen und ein Metalloxid, wobei die Menge an eisendotierten Zeolithen in der Trockenmasse der Beschichtung zwischen 3 und 80 Gew.-%, bevorzugt zwi schen 5 und 75 Gew.-% und am meisten bevorzugt zwischen 10 und 70 Gew.-% liegt.In a preferred embodiment comprises the coating the coating catalyst (SCR and / or oxidation catalyst) an iron-doped zeolite and a metal oxide, wherein the Amount of iron-doped zeolites in the dry mass of the coating between 3 and 80% by weight, preferably between 5 and 75% by weight and on most preferably between 10 and 70 wt .-% is.
Bevorzugt ist das Metalloxid ausgewählt aus der Gruppe bestehend aus Aluminiumoxid, Siliziumoxid, Eisenoxid, Ceroxid, Zirkoniumoxid und einem aus den Metalloxiden ausgewählten Mischoxid. Diese Metalloxide gewährleisten die Herstellung eines Katalysators mit einer hohen Oberfläche. Ferner sind die ausgewählten Metalloxide besonders kostengünstig.Prefers the metal oxide is selected from the group consisting of alumina, silica, iron oxide, ceria, zirconia and a mixed oxide selected from the metal oxides. These metal oxides ensure the production of a catalyst with a high surface area. Furthermore, the selected Metal oxides particularly inexpensive.
Gemäß einer weiteren bevorzugten Ausführungsform umfasst der Oxidationskatalysator eine katalytisch aktive Komponente umfassend Edelmetalle, insbesondere Palladium, Platin, Rhodium, Iridium, Silber, Gold, oder Metalloxide von Eisen, Mangan, Kupfer und/oder Kombinationen davon.According to one Another preferred embodiment comprises the oxidation catalyst a catalytically active component comprising noble metals, in particular Palladium, platinum, rhodium, iridium, silver, gold, or metal oxides of iron, manganese, copper and / or combinations thereof.
Gemäß der erfindungsgemäßen Katalysatoranordnung soll der Partikelfilter (DPF) als erste Komponente des Abgasreinigungssystems angeordnet sein.According to the The catalyst arrangement according to the invention is intended to be Particulate filter (DPF) as the first component of the emission control system be arranged.
Für einen DPF sind eine Vielzahl von mit katalytisch aktiven Materialien beschichteten Trägern für Abgasfilter bzw. Abgaskatalysatoren bekannt. Vorzugsweise sind die katalytisch aktiven Schichten (geträgerter Katalysator) ausgewählt aus Aluminium-, Cer-, Wolfram-, Titan- und Zirkonoxid, die noch zusätzlich katalytisch aktive Edelmetalle zur Oxidation von Kohlenwasserstoffen, zur Oxidation von CO und von abgelagerten organischen Partikeln, wie z. B. Ruß und dergleichen enthalten.For a DPF are a variety of catalytically active materials coated carriers for exhaust filters or catalytic converters known. Preferably, the catalytically active layers (supported Catalyst) selected from aluminum, cerium, tungsten, Titanium and zirconium oxide, which additionally catalytic active precious metals for the oxidation of hydrocarbons, for oxidation of CO and deposited organic particles, such. B. soot and like that.
Die Katalytisch aktiven Metalloxide oder ihre Hydroxide sind im Wesentlichen wasserunlöslich. Bevorzugt ist es daher, Aluminiumoxide als wässrige Aufschlämmung mit wasserlöslichen Salzen der Oxide, insbesondere Nitrate, Chloride, Hydroxide, Sulfite, Acetate oder Komplexverbindungen der katalytisch ak tiven Metalle auf Substrate aufzubringen bzw. diese damit zu imprägnieren und diese Salze anschließend bei hohen Temperaturen zu zersetzen, wobei deren Oxide entstehen.The Catalytically active metal oxides or their hydroxides are essentially water-insoluble. It is therefore preferred, aluminum oxides as an aqueous slurry with water-soluble Salts of the oxides, in particular nitrates, chlorides, hydroxides, sulfites, Acetates or complex compounds of the catalytically active metals Apply to substrates or impregnate them with it and then these salts at high temperatures decompose, their oxides are formed.
Bevorzugt ist ferner eine kontinuierliche Regeneration des Partikelfilters, ohne dass z. B. eine periodische Nacheinspritzung von Kraftstoff zur Erhöhung der Abgastemperatur erforderlich ist. Um die Effizienz des Katalysators zu erhöhen, sollte daher eine große Oberfläche bereitgestellt werden, damit die katalytisch aktiven Zentren mit den Rußpartikeln in Berührung kommen können. Die dabei notwendige große Oberfläche wird beispielsweise dadurch erzeugt, dass eine Schicht eines Katalysatorträgers, wie beispielsweise oberflächenreiches gamma-Aluminiumoxid oder Titanoxid, auf einem Filtermaterial abgelagert wird und ein Metall, insbesondere ein Metall der Platingruppe, das als aktive Spezies für die Oxidation von Partikelmaterial bekannt ist, mittels einer Metallsalzlösung oder Metallkomplexverbindung in den Filter integriert wird.Prefers is also a continuous regeneration of the particulate filter, without that z. B. a periodic post-injection of fuel to increase the exhaust gas temperature is required. To the efficiency of the catalyst should therefore be a large Surface be provided so that the catalytic active centers with the soot particles in contact can come. The necessary large surface is generated, for example, by a layer of a catalyst support, such as For example, high-surface gamma-alumina or Titanium oxide is deposited on a filter material and a metal, in particular, a platinum group metal that acts as an active species for the oxidation of particulate material is known by means of a metal salt solution or metal complex compound in the filter is integrated.
Für die katalytische Beschichtung von derartigen Substraten, insbesondere mit innerer Oberfläche, d. h. also poröse Substrate bzw. Metallmonolithe mit im Wesentlichen durchgehenden Kanälen, werden wie vorstehend schon ausgeführt unterschiedliche Beschichtungsverfahren und Beschichtungsmaterialien unter Verwendung von so genannten „washcoats" (worunter üblicherweise meist wässrige Aufschlämmungen von Feststoffen verstanden werden) verwendet.For the catalytic coating of such substrates, in particular with inner surface, d. H. so porous substrates or metal monoliths with essentially continuous channels, be different as already stated above Coating methods and coating materials using of so-called "washcoats" (under which usually mostly aqueous slurries of solids understood) are used.
Bevorzugte „Washcoats" im Sinne dieser Erfindung können eine Vielzahl von Oxiden umfassen, die katalytisch aktiv sind, wie beispielsweise La2O3, Co2O3, Nd2O3, TiO2, ZrO2, CeO2 etc., allein oder in Kombination.For the purposes of this invention, preferred "washcoats" may comprise a multiplicity of oxides which are catalytically active, for example La 2 O 3 , Co 2 O 3 , Nd 2 O 3 , TiO 2 , ZrO 2 , CeO 2, etc., alone or in combination.
Weitere bevorzugte Kombinationen umfassen beispielsweise ein Aluminiumoxid mit hoher Oberfläche, des Weiteren Zinkoxid und wenigstens ein Edelmetall aus der Gruppe bestehend aus Palladium, Platin, Rhodium oder einer Kombination davon, die ebenfalls auf einem monolithischen Träger mittels eines Washcoats aufgebracht werden.Further preferred combinations include, for example, an alumina high surface area, further zinc oxide and at least one Precious metal from the group consisting of palladium, platinum, rhodium or a combination thereof, also on a monolithic Carrier be applied by means of a washcoat.
Weitere einfache Verfahren, wie das Eintauchen des Katalysatorträgers in einen Washcoat und das Entfernen von überschüssigem Washcoat durch Ausblasen mit Luft, sind ebenfalls aus dem Stand der Technik bekannt, wie auch Beschichtungsverfahren unter Einsatz von Zentrifugen. Ebenso ist auch die Möglichkeit des Besprühens poröser Formkörper mit einem Washcoat vorgeschlagen worden. Als Beschichtung werden zumeist in der Regel auf Aluminiumoxid basierende Washcoats eingesetzt, die durch ihre große Oberfläche charakterisiert sind.Further simple procedures, such as dipping the catalyst support into a washcoat and removing excess Washcoat by blowing out with air, are also out of the state the technique known, as well as coating method using of centrifuges. As well as the possibility of spraying porous molded body proposed with a washcoat Service. As a coating are usually usually on alumina based washcoats used by their large surface area are characterized.
Dabei werden in dem auf beispielsweise Aluminiumoxid basierenden Washcoat Metalle wie die Metalle der Platingruppe, z. B. durch Lösung, Totalabsorption oder durch Tränken mit Edelmetall-haltigen Lösungen oder durch Einarbeiten in den Washcoat vor der Beschichtung, integriert.there are in the example based on alumina washcoat Metals such as platinum group metals, e.g. By solution, Total absorption or by impregnation with precious metal-containing Solutions or by incorporating in the washcoat before Coating, integrated.
Die für die Partikeloxidation zur Verfügung stehende Oberfläche hat einen erheblichen Einfluss auf den katalytischen Umsatz und insbesondere auf die Langzeitstabilität des Katalysators. Es ist bekannt, dass zur Erhöhung der Stabilität der Aluiniumoxidoberfläche den Washcoats oft stabilisierende Elemente, wie z. B. Cer oder Lanthan, beigemischt werden können.The available for particle oxidation Surface has a significant influence on the catalytic Sales and in particular the long - term stability of the Catalyst. It is known that to increase stability the alumina surface of washcoats often stabilizing elements, such as As cerium or lanthanum, can be added.
Durch die erfindungsgemäße Katalysatoranordnung, wobei verschiedene katalytische Funktionen in einzelnen Bauteilen kombiniert wurden, konnte ersichtlich eine Verringerung des Raumbedarfs für ein Abgassystem erreicht werden.By the catalyst arrangement according to the invention, wherein combined different catalytic functions in individual components were able to clearly see a reduction in space requirements for a Exhaust system can be achieved.
Zusammengefasst werden konnte insbesondere eine SCR-aktive Komponente, eine Kohlenwasserstoffspeicherkomponente und zusätzlich noch eine hydrolytisch aktive Komponente (H-Kat) in einem Bauteil (SCR-Katalysator).Summarized In particular, an SCR-active component, a hydrocarbon storage component, could be used and additionally a hydrolytically active component (H-Cat) in one component (SCR catalyst).
Zusammengefasst werden konnten ferner der Oxidationskatalysator und der Ammoniak-Sperrkatalysator in einem Bauteil (Oxidationskatalysator).Summarized could also be the oxidation catalyst and the ammonia barrier catalyst in one component (oxidation catalyst).
Darüber hinaus konnte eine SCR-aktive Komponente, eine Kohlenwasserstoffspeicherkomponente und ein Oxidationskatalysator in einem Bauteil zusammengefasst werden.About that In addition, an SCR-active component, a hydrocarbon storage component and an oxidation catalyst are combined in one component.
Der erfindungsgemäße SCR-Katalysator und das Abgasreinigungssystem können zur Abgasbehandlung von Abgasen von Verbrennungsmotoren verwendet werden. Verbrennungsmotoren im Sinne dieser Erfindung sind beispielsweise Dieselmotoren oder Stationärmotoren.Of the SCR catalyst according to the invention and the exhaust gas purification system can be used for the exhaust gas treatment of exhaust gases of internal combustion engines become. Internal combustion engines in the context of this invention are, for example Diesel engines or stationary engines.
Die Erfindung soll nun anhand einiger Beispiele, welche nicht als einschränkend auf den Umfang der Erfindung zu verstehen sind, unter Bezugnahme auf die Figuren näher erläutert werden.The Invention will now be described by way of some examples, which are not to be considered as limiting to the scope of the invention, with reference be explained in more detail on the figures.
Dabei
zeigt
Ausführungsbeispieleembodiments
Anordnung 1 (siehe
DPF (
Als
DPF (
SCR-Katalysator
(
Oxidationskatalysator (
Als
Oxidationskatalysator (
Harnstoffdosierung (
Die
Einrichtung zur Harnstoffdosierung (
Anordnung
In
diesem Fall trägt der SCR-Katalysator (
DPF (
Als
DPF (
SCR-Katalysator (
Für
den SCR-Katalysator (
Harnstoffdosierung (
Die
Einrichtung zur Harnstoffdosierung (
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
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Zitierte Nicht-PatentliteraturCited non-patent literature
- - D. S. Coombs et al., Canadian Mineralogist, 35, 1979, 1571 [0028] DS Coombs et al., Canadian Mineralogist, 35, 1979, 1571 [0028]
Claims (24)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102008009672.5A DE102008009672B4 (en) | 2008-02-18 | 2008-02-18 | Hydrocarbon storage function SCR catalyst, its use and emission control system and its use |
PCT/EP2009/000623 WO2009103406A1 (en) | 2008-02-18 | 2009-01-30 | Scr catalyst comprising a hydrocarbon accumulator function and catalyst assembly |
Applications Claiming Priority (1)
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DE102008009672.5A DE102008009672B4 (en) | 2008-02-18 | 2008-02-18 | Hydrocarbon storage function SCR catalyst, its use and emission control system and its use |
Publications (2)
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DE102008009672A1 true DE102008009672A1 (en) | 2009-08-27 |
DE102008009672B4 DE102008009672B4 (en) | 2016-02-25 |
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DE102008009672.5A Expired - Fee Related DE102008009672B4 (en) | 2008-02-18 | 2008-02-18 | Hydrocarbon storage function SCR catalyst, its use and emission control system and its use |
Country Status (2)
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DE (1) | DE102008009672B4 (en) |
WO (1) | WO2009103406A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2324916A1 (en) * | 2009-11-19 | 2011-05-25 | Ibiden Co., Ltd. | Honeycomb structure and exhaust gas converter |
DE102012209852A1 (en) | 2012-06-12 | 2013-12-12 | Robert Bosch Gmbh | Exhaust gas purification system for arrangement in exhaust section of exhaust gas system of diesel internal combustion engine in motor vehicle, has input-oxidation catalyzer for oxidation of hydrocarbons and carbon monoxide |
EP2436899A3 (en) * | 2010-10-02 | 2014-07-09 | Volkswagen Aktiengesellschaft | Method for operating a combustion engine and device for implementing the method |
WO2015011452A1 (en) * | 2013-07-26 | 2015-01-29 | Johnson Matthey Public Limited Company | Tungsten/titania oxidation catalyst |
DE102015205843A1 (en) * | 2015-03-31 | 2016-10-06 | Johnson Matthey Catalysts (Germany) Gmbh | Catalyst, in particular for exhaust gas purification |
EP3327262A1 (en) * | 2016-11-28 | 2018-05-30 | Hyundai Motor Company | Device for purifying exhaust gas |
DE102015121216B4 (en) | 2015-09-30 | 2022-06-09 | Hyundai Motor Company | Exhaust Aftertreatment System |
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DE102010050312A1 (en) * | 2010-11-03 | 2012-05-03 | Süd-Chemie AG | Ammonia oxidation catalyst with low N2O by-product formation |
EP2755764B1 (en) | 2012-08-17 | 2016-07-27 | Johnson Matthey Public Limited Company | Zeolite promoted v/ti/w catalysts |
CN108786783A (en) * | 2018-06-11 | 2018-11-13 | 上海电力学院 | The SCR catalyst and preparation method thereof that a kind of resistant to potassium for denitrating flue gas poisons |
Citations (2)
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WO2002100520A1 (en) * | 2001-06-09 | 2002-12-19 | Umicore Ag & Co. Kg | Redox-catalyst for selective catalytic reduction and method for the production thereof |
WO2008006427A1 (en) * | 2006-07-08 | 2008-01-17 | Umicore Ag & Co. Kg | Textured scr catalyst for the reduction of nitrogen oxides from the exhaust gases of a lean-mixture engine with the use of ammonia as reducing agent |
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US5024981A (en) * | 1989-04-20 | 1991-06-18 | Engelhard Corporation | Staged metal-promoted zeolite catalysts and method for catalytic reduction of nitrogen oxides using the same |
US5120695A (en) * | 1989-07-28 | 1992-06-09 | Degusaa Aktiengesellschaft (Degussa Ag) | Catalyst for purifying exhaust gases from internal combustion engines and gas turbines operated at above the stoichiometric ratio |
US6093378A (en) * | 1997-05-07 | 2000-07-25 | Engelhard Corporation | Four-way diesel exhaust catalyst and method of use |
DE10308287B4 (en) * | 2003-02-26 | 2006-11-30 | Umicore Ag & Co. Kg | Process for exhaust gas purification |
US7481983B2 (en) * | 2004-08-23 | 2009-01-27 | Basf Catalysts Llc | Zone coated catalyst to simultaneously reduce NOx and unreacted ammonia |
JP5296291B2 (en) * | 2005-12-08 | 2013-09-25 | いすゞ自動車株式会社 | Exhaust gas purification system |
DE102005061713B4 (en) * | 2005-12-22 | 2015-05-21 | Süd-Chemie Ip Gmbh & Co. Kg | Volatile hydrocarbon adsorber unit, method of making a zeolitic adsorbent material and zeolitic adsorbent material obtainable by the method |
DE102006031650B4 (en) * | 2006-07-08 | 2014-11-20 | Man Truck & Bus Ag | Arrangement for reducing nitrogen oxides in exhaust gases |
GB0617070D0 (en) * | 2006-08-30 | 2006-10-11 | Johnson Matthey Plc | Low Temperature Hydrocarbon SCR |
DE102007003155A1 (en) * | 2007-01-22 | 2008-07-24 | Süd-Chemie AG | Catalyst composition for the reduction of nitrogen oxides |
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2008
- 2008-02-18 DE DE102008009672.5A patent/DE102008009672B4/en not_active Expired - Fee Related
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2009
- 2009-01-30 WO PCT/EP2009/000623 patent/WO2009103406A1/en active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2002100520A1 (en) * | 2001-06-09 | 2002-12-19 | Umicore Ag & Co. Kg | Redox-catalyst for selective catalytic reduction and method for the production thereof |
WO2008006427A1 (en) * | 2006-07-08 | 2008-01-17 | Umicore Ag & Co. Kg | Textured scr catalyst for the reduction of nitrogen oxides from the exhaust gases of a lean-mixture engine with the use of ammonia as reducing agent |
Non-Patent Citations (1)
Title |
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D. S. Coombs et al., Canadian Mineralogist, 35, 1979, 1571 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2324916A1 (en) * | 2009-11-19 | 2011-05-25 | Ibiden Co., Ltd. | Honeycomb structure and exhaust gas converter |
US8691157B2 (en) | 2009-11-19 | 2014-04-08 | Ibiden Co., Ltd. | Honeycomb structure and exhaust gas converter |
US8961886B2 (en) | 2009-11-19 | 2015-02-24 | Ibiden Co., Ltd. | Honeycomb structure |
EP2436899A3 (en) * | 2010-10-02 | 2014-07-09 | Volkswagen Aktiengesellschaft | Method for operating a combustion engine and device for implementing the method |
DE102012209852A1 (en) | 2012-06-12 | 2013-12-12 | Robert Bosch Gmbh | Exhaust gas purification system for arrangement in exhaust section of exhaust gas system of diesel internal combustion engine in motor vehicle, has input-oxidation catalyzer for oxidation of hydrocarbons and carbon monoxide |
WO2015011452A1 (en) * | 2013-07-26 | 2015-01-29 | Johnson Matthey Public Limited Company | Tungsten/titania oxidation catalyst |
US9943830B2 (en) | 2013-07-26 | 2018-04-17 | Johnson Matthey Public Limited Company | Tungsten/titania oxidation catalyst |
DE102015205843A1 (en) * | 2015-03-31 | 2016-10-06 | Johnson Matthey Catalysts (Germany) Gmbh | Catalyst, in particular for exhaust gas purification |
DE102015121216B4 (en) | 2015-09-30 | 2022-06-09 | Hyundai Motor Company | Exhaust Aftertreatment System |
EP3327262A1 (en) * | 2016-11-28 | 2018-05-30 | Hyundai Motor Company | Device for purifying exhaust gas |
Also Published As
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DE102008009672B4 (en) | 2016-02-25 |
WO2009103406A1 (en) | 2009-08-27 |
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