摘要:
Es wird ein Dieselpartikelfilter vorgestellt, das ein keramisches Wandflußfiltersubstrat und eine in den Anströmkanälen aufgebrachte Beschichtung aus hochschmelzendem Material enthält. Die Beschichtung (6) ist so beschaffen, daß sie die die Anströmkanäle (1) und Abströmkanäle (2) verbindenden Poren (5) in der Wand (4) anströmseitig für Rußpartikel (7) verschließt, ohne dabei den Durchtritt der gasförmigen Abgasbestandteile zu verhindern. Die Beschichtung kann aus einem oder mehreren hochschmelzenden Oxiden oder aus hochschmelzendem Fasermaterial hergestellt werden. In beiden Fällen führt die Beschichtung dazu, daß die Tiefenfiltration deutlich vermindert und somit der während der Tiefenfiltrationsphase zu beobachtende Staudruckanstieg signifikant verringert wird.
摘要:
A diesel particle filter having an oxidation catalyst comprising platinum and palladium deposited thereon is described. The conversion of hydrocarbons and carbon monoxide can be significantly improved by mixing zeolites as HC storage components into the oxidation catalyst. Furthermore, the particle filter is coated with a second catalyst which does not contain any zeolites from the inlet end to part of the length.
摘要:
Die Erfindung betrifft eine Anordnung zur Behandlung von Stickoxide (NO x ) und Kohlenwasserstoffe (HC) enthaltenden Dieselmotorenabgasen, wobei ein SCR-System aus einem SCR-Katalysator und einer Einspritzeinrichtung für Reduktionsmittel vor einem Oxidationskatalysator angeordnet ist, wobei der SCR-Katalysator einen mit Kupfer (Cu) und/oder Eisen (Fe) ausgetauschten Zeolithen enthält und der Zeolith so beschaffen ist, dass die im Abgas enthaltenen Kohlenwasserstoffe durch die molekularsiebartige Wirkung des Zeolithen von den aktiven Zentren im Katalysator, an denen die Umsetzungen stattfinden, ferngehalten werden, wobei der Zeolith eine größte untere Kanalweite von 2,6 Ä - 4,2 Ä aufweist.
摘要:
The invention relates to a nitrogen oxide storage catalyst consisting of at least two catalytically active coatings on a supporting body, a lower coating (A) containing cerium oxide in addition to platinum and/or palladium and no alkaline earth compound and an upper coating (B), which is arranged above coating (A), containing an alkaline earth compound and a basic magnesium-aluminium mixed oxide in addition to platinum and palladium. The invention also relates to a method for converting NOx in the exhaust gases of motor vehicles operated using lean-burn engines.
摘要:
To equip a diesel particle filter with a zeolitic coating evenly distributed over the entire length of the particle filter and with another non-zeolitic coating applied from the inlet side of the filter up to only a certain length of the filter, it is proposed to first apply the non-zeolitic coating from the inlet side of the filter and only then to apply the zeolitic coating over the entire length of the filter from the outlet side of the filter. Through this sequence of coatings, a better adhesion strength of the coatings is guaranteed than if both coatings are applied from the inlet side.
摘要:
The invention relates to a catalyst comprising at least two catalytically active layers A and B, wherein A contains a carrier oxide and the components A1 and A2, and B contains a carrier oxide and the components B1, B2, and B3, wherein A1, A2, and B1 to B3 are defined as disclosed in claim 1. The proportion of component A1 in layer A is thereby greater than the proportion of component B1 in layer B, wherein the proportion of layer A with respect to the total weight of layers A and B is greater than the proportion of layer B. The invention further relates to a method for reducing nitrogen oxides in exhaust gases of lean-burn internal combustion engines, and to an exhaust gas cleaning system.
摘要:
The invention relates to a catalytically active material for reacting nitrogen oxides with ammonia in the presence of hydrocarbons. The material consists of an inner core (1) made of a zeolite exchanged with one or more transition metals or a zeolite-like compound exchanged with one or more transition metals. The core of the catalytically active material is encased by a shell (2), which is made of one or more oxides selected from silicon dioxide, germanium dioxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, zirconium dioxide, and mixed oxides thereof.