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Role of NO in Diesel Particulate Emission Control
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English
Abstract
The effective use of a catalyst to initiate regeneration of a diesel particulate trap has traditionally been based on the concept that the catalyst coated onto the trap adsorbs particulate, and activates oxygen in the exhaust causing initiation of particulate combustion. Reported regeneration temperatures generally lie in the range of 350°C and above. This paper reports on a new mechanism of diesel particulate combustion involving activation of oxygen over a catalyst to form NO2, which is then capable of adsorbing on diesel particulate trapped in a filter and initiating combustion at lower temperatures. Diesel particulate has been combusted on a wire mesh trap at temperatures as low as 265°C, and this regeneration capability has been maintained over hundreds of hours of operation. However, the most active catalysts for low temperature activation of diesel particulate are also high sulfate producers. In the absence of low sulfur fuel, future direction must concentrate on improvement of catalyst selectivity such that high NO2 and low SO3 formation may be achieved to obtain the concurrent goals of low regeneration temperature and low sulfate emissions.
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Cooper, B. and Thoss, J., "Role of NO in Diesel Particulate Emission Control," SAE Technical Paper 890404, 1989, https://doi.org/10.4271/890404.Also In
References
- “Mobile Source Emission Standards Summary” United States Environmental Protection Agency Washington, D.C. 1987
- Wall J.C. Shimpi S.A. Yu M.L. “Fuel Sulfur Reduction for Control of Diesel Engine Particulate Emissions” SAE Paper 872139 1987
- Oser P. Thoms U. “Particulate Control Systems for Diesel Engines Using Catalytically Coated and Uncoated Traps with Consideration of Regeneration Techniques” SAE Paper 830087 1983
- Cooper B.J. Harrison B. Shutt E. Lichtenstein I.E. “The Role of Rhodium in Rh/Pt Catalysts for CO/HC/NOx and SO 4 = Emission Control - The Influence of Oxygen on Catalyst Performance” SAE Paper 770367 1977
- Otto K. Sieg M.H. Zinbo M. Bartosiewicz L. “The Oxidation of Soot Deposits from Diesel Engines” SAE Paper 800336 1980
- Satterfield C.N. “Mass Transfer in Heterogeneous Catalysis” Ch. 5.3 p. 225 M.I.T. Press Cambridge, MA 1970