Abstract:
Die vorliegende Erfindung betrifft ein Katalysatorsystem zur Reduktion von Stickoxiden, das einen Stickoxidspeicherkatalysator und einen SCR- Katalysator umfasst, wobei der Stickoxid-Speicherkatalysator aus mindestens zwei katalytisch aktiven Washcoatschichten auf einem Tragkörper besteht, wobei eine untere Washcoatschicht A Ceroxid, eine Erdalkaliverbindung und/oder Alkaliverbindung, sowie Platin und Palladium enthält und eine obere Washcoatschicht B, die über der Washcoatschicht A angeordnet ist, Ceroxid, Platin und Palladium und keine Alkali- und Erdalkaliverbindung enthält, sowie ein Verfahren zur Konvertierung von NOx in Abgasen von Kraftfahrzeugen, die mit mager betriebenen Motoren, betrieben werden.
Abstract:
La présente invention concerne une masse de captation comprenant une matrice oxyde majoritairement aluminique calcinée et une phase active comprenant au moins un sulfure métallique dont le métal est choisi dans le groupe constitué par le cuivre, le chrome, le manganèse, le fer, le cobalt et le nickel, ladite phase active étant au moins en partie comalaxée au sein de ladite matrice oxyde majoritairement aluminique calcinée, le pourcentage poids du ou des métaux de la phase active, exprimé par rapport aux poids total de la masse de captation étant compris entre 4 et 55 %, ladite masse étant caractérisée par une distribution en taille de pores trimodale. Elle concerne également des procédés de préparation de ladite masse par comalaxage et son utilisation dans un procédé de captation de métaux lourds dans un effluent gazeux ou liquide.
Abstract:
Process for manufacturing ZPGM catalysts systems that may allow the prevention of formation or the conversion of corrosion causing compounds, such as hexavalent chromium compounds, within ZPGM catalyst systems is disclosed. In one embodiment, disclosed ZPGM catalysts systems, may include metallic substrate, which may include alloys of iron and chromium, a washcoat and an overcoat. Disclosed manufacturing process may include a thermal decomposition of hexavalent chromium compounds which may allow the decomposition of such compounds into trivalent chromium compounds, and may also produce metallic catalyst, such as silver. Such conversion may prevent corrosion formation, such as red color corrosion within ZPGM catalyst system. An embodiment of the disclosed process may include a reducing agent, which may be present in exhaust conditions, which may convert hexavalent chromium compounds into trivalent chromium compounds as well as produce metallic catalyst, such as silver. Employing the disclosed manufacturing process may allow the production of ZPGM catalyst systems that may exhibit high activity and enhanced performance.
Abstract:
본 발명은 공기 정화 장치에 관한 것이다. 본 발명은 외부로부터 유입되는 공기에 포함된 가스상 오염 물질이 흡착 및 정화되는 정화 부재; 및 상기 정화 부재에 흡착된 상기 가스상 오염 물질을 마이크로파 가열에 의해 분해 및 탈착시키는 탈착 수단을 포함하고, 상기 정화 부재는 상기 가스상 오염 물질을 흡착하는 흡착제, 상기 마이크로파를 흡수하는 유전 물질 및 상기 흡착된 가스상 오염 물질을 산화하기 위한 산화 촉매를 포함하는 것을 특징으로 한다. 본 발명에 따르면, 본 발명에 의하면 외부로부터 유입되는 오염 공기에 포함된 가스상 오염 물질의 흡착, 탈착, 및 정화가 연속적 또는 간헐적으로 이루어져 정화 부재가 재생될 수 있으므로 정화 부재의 흡착 효율을 지속적으로 유지함과 동시에 수명을 크게 향상시킬 수 있는 효과를 갖는다.
Abstract:
Compositions and methods for the preparation of ZPGM oxidation catalytic converters are disclosed. ZPGM oxidation catalyst systems are completely free of PGM catalyst and may include: a substrate, a washcoat, and an overcoat. Washcoat may include silver as ZPGM catalyst, and carrier material oxides. Similarly, overcoat may include at least one ZPGM catalyst, carrier material oxides and OSMs. Overcoat of the disclosed ZPGM catalyst system may include copper and cerium as ZPGM catalysts. Suitable known in the art chemical techniques, deposition methods and treatment systems may be employed in order to form the disclosed ZPGM catalyst systems. ZPGM catalyst systems may include high surface area, low conversion temperature catalysts that may exhibit high efficiency in the conversion of exhaust gases.
Abstract:
A catalyst composition comprises a mixed metal catalyst which comprises unalloyed palladium and palladium-gold alloy disposed on a support, wherein the palladium-gold alloy is enriched in gold and at least one promoter in which said promoter comprises at least one reducible metal oxide.
Abstract:
Die Erfindung betrifft die Verwendung eines Katalysators, enthaltend (a) 0,001 bis 10 Gew.-% (bezogen auf das Gesamtsystem) einer oder mehrerer Übergangs-metalle, (b) 0,01 bis 10 Gew.-% (bezogen auf das Gesamtsystem) Stickstoff, (c) 10 bis 99,989 Gew.-% (bezogen auf das Gesamtsystem) einer oder mehrerer leitfähiger Träger, und (d) 0 bis 89,989 Gew.-% (bezogen auf das Gesamtsystem) einer oder mehrerer weiterer Komponenten, zur elektrochemischen Oxidation von Schwefel(IV)-Verbindungen.