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AssigneesBASF Mobile Emissions Catalysts LLC, University of Central Flordia Research Foundation, Inc.
InventorsFudong Liu, Yuejin Li, Shaohua Xie
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The present disclosure provides SCR catalyst compositions capable of reducing nitrogen oxide (NOx) emissions in engine exhaust. The catalyst compositions include a reducible metal oxide support containing ceria, one or more transition metal oxides as a redox promotor; and an oxide of niobium, tungsten, silicon, molybdenum, or a combination thereof as an acidic promotor. The redox promotor and the acid promotor are both supported on the reducible metal oxide support. Further provided are SCR catalyst articles coated with such compositions, processes for preparing such catalyst compositions and articles, an exhaust gas treatment system including such catalyst articles, and methods for reducing NOx in an exhaust gas stream using such catalyst articles and systems.
A selective catalytic reduction (SCR) catalyst composition for the abatement of nitrogen oxides (NOx), the catalyst composition comprising:
A selective catalytic reduction (SCR) catalyst article to abate nitrogen oxides (NOx), the SCR catalyst article comprising a substrate having a SCR catalyst composition disposed on at least a portion thereof,
A method for preparing a selective catalytic reduction (SCR) catalyst composition comprising a reducible metal oxide support comprising ceria, a redox promotor comprising one or more transition metal oxides, and an acidic acid promotor comprising an oxide of niobium, tungsten, silicon, or a combination thereof, wherein the redox promotor and the acid promotor are supported on the reducible metal oxide support, and the acid promotor is niobium (V) oxide (Nb2O5), present in an amount of about 6% to about 10% by weight on an oxide basis, based on the total weight of the catalyst composition, the method comprising:
Dependencies are inferred from the claim text.