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AssigneeBASF Mobile Emissions Catalysts LLC
InventorsXinyi Wei, Xiaoming Xu, Evan Vincent Miu
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The present disclosure is directed to Low Temperature NOx-Absorber (LT-NA) catalyst compositions, catalyst articles, and an emission treatment system for treating an exhaust gas, each including the LT-NA catalyst compositions. Further provided are methods for reducing a NOx level in an exhaust gas stream using the catalyst article. In particular, the LT-NA compositions include a zeolite containing a first metal component including palladium and a second metal component which is an alkaline earth metal component, an oxide of an alkaline earth metal component, a rare earth metal component, an oxide of a rare earth metal component, or a combination thereof. The LT-NA compositions exhibit increased low temperature NOx adsorption capacity and enhanced hydrothermal stability.
A Low Temperature NOx Adsorber (LT-NA) composition comprising a zeolite having at least a first metal component and a second metal component included therewith, wherein the first metal component includes palladium, and wherein the second metal component is selected from the group consisting of an alkaline earth metal component, an oxide of an alkaline earth metal component, a rare earth metal component, an oxide of a rare earth metal component, and combinations thereof wherein more than 50% of exchange sites of the zeolite are exchanged with palladium ions.
A method for modulating one or both of a NOx adsorption/desorption profile of a LT-NA composition and a NOx desorption temperature range of a LT-NA composition, the LT-NA composition comprising a zeolite comprising a first metal component and a second metal component, wherein the first metal component includes palladium, and the second metal component is selected from the group consisting of an alkaline earth metal component, an oxide of an alkaline earth metal component, a rare earth metal component, an oxide of a rare earth metal component, and a combination thereof, the method comprising selecting the second metal component and the loading thereof wherein more than 50% of exchange sites of the zeolite are exchanged with palladium ions.
Dependencies are inferred from the claim text.