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US 7,605,109 B1Granted
Platinum-bismuth catalysts for treating engine exhaust
AssigneeNanostellar, Inc.
InventorsJifei Jia, Kyle L. Fujdala, Timothy J. Truex
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AssigneeNanostellar, Inc.
InventorsJifei Jia, Kyle L. Fujdala, Timothy J. Truex
Estimating the term…
An engine exhaust catalyst containing precious metal nanoparticles is promoted with bismuth. The bismuth promotion improves the catalyst's CO oxidation performance. Also, by varying the amount of bismuth that is added, the NO conversion rate that can be realized with the catalyst can be controlled. The control over the NO conversion rate is important because the passive regenerative performance of a particulate filter used in engine exhaust systems is based on the amount NO2 that is present in the exhaust stream that reaches the particulate filter. The amount of NO2 being produced needs to be optimized (not necessarily maximized) so that adequate particulate filter regeneration performance can be maintained while avoiding unused, toxic NO2 from being exhausted into the atmosphere.
An engine exhaust catalyst comprising an alumina carrier promoted with bismuth, the alumina carrier having a plurality of pores in which platinum metal particles are supported, wherein the platinum metal particles have been reduced in the pores of the alumina carrier.
A diesel engine exhaust catalyst comprising an alumina carrier promoted with bismuth, the alumina carrier having a plurality of pores, in which platinum metal particles are supported, wherein the amount of bismuth in the catalyst is about 0.1 weight percent to about 20 weight percent, and the amount of platinum in the catalyst is about 0.1 weight percent to about 10 weight percent.
Dependencies are inferred from the claim text.