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AbstractA US Global Automotive Manufacturer, invites proposals for selective catalyst technologies that preferentially oxidize CO to CO2 over NH3 to NOx and/or N2.DetailsEnvironmental concerns are demanding increasingly effective control of automotive exhaust emissions. Hydrocarbon and CO emissions, as well as NOx emissions are of concern. Hydrocarbons and CO emissions are treated with an oxidation catalyst to convert them to CO2 and water. Under oxygen-rich environments, NOx emissions are controlled through the use of a selective catalytic reduction (SCR) device. This technology requires the introduction of ammonia to faciliate the conversion of NOx to N2. The ammonia intermediary is critical to ensuring the reduction reactions occur per design and result in minimum NOx emissions leaving the tailpipe.The client seeks to further reduce CO emissions by using an additional oxidation catalyst in the vicinity of the SCR device. However, if this oxidation catalyst is not discriminating, some of the injected ammonia can be oxidized to NOx and/or N2 – thereby defeating the purpose of ammonia injection and reducing the effectivenss of the SCR device. Thus, the client wishes to identify and develop new selective catalyst materials and/or designs which can selectively oxidize CO to CO2 over NH3 to NOx. POSSIBLE APPROACHES Possible approaches might include, but are not limited to: • Novel oxide-based catalysts • Zeolite based catalysts APPROACHES NOT OF INTEREST The following approaches are not of interest: • Systems based on conventional Pt or Pd catalysts • Non-catalytic systems Technical Specifications / Specific technical requirements: The successful technology will: • Convert CO to CO2 at a rate of =80% • Convert NH3 to NOx/N2 at a rate of =10% • Operate in the temperature range of 150 to 600°C • Be free of highly corrosive, toxic, or volatile components • Be compatible with both diesel and direct injection gasoline engines • Cost <1.5 times price of currently available selective catalysts
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