Catalytic material and method for abatement of nitrogen oxides

A three-way catalytic material contains palladium-containing inorganic support particles that include lanthanum and praseodymium and is preferably substantially free of neodymium and barium. The combination of lanthanum and praseodymium together with the palladium serves to signigicantly enhance NOx...

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Bibliographische Detailangaben
Hauptverfasser:	CHUNG-ZONG WAN, ALAN R. AMUNDSEN, SHAU-LIN F. CHEN
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:	A three-way catalytic material contains palladium-containing inorganic support particles that include lanthanum and praseodymium and is preferably substantially free of neodymium and barium. The combination of lanthanum and praseodymium together with the palladium serves to signigicantly enhance NOx reduction in gas streams that do not contain significant quantities of SO2. The catalytic material may also include other platinum grup metals, e.g., platinum, rhodium, etc. Optionally, the palladium, lanthanum and praseodymium-containing particles may be different from the particles containing the other platinum group metals.