NOx Adsorber Catalysts with Improved Desulfation Properties and Enhanced Low-Temperature Activity 2009-01-0283
NOx adsorber catalyst technology has been successfully applied on diesel vehicles to enable them to satisfy stringent NOx emission regulations. One limitation of this technology is the requirement to regularly desulfate the adsorber to maintain high NOx conversion efficiency. In addition to adding significant engine and calibration complexity, these high temperature desulfation events accelerate the thermal degradation of the exhaust system components. Minimization of the severity and the frequency of the desulfation events is highly desirable. Laboratory studies to understand desulfation processes and to identify improved NOx Adsorber washcoat compositions are described. These studies led to a new generation of NOx adsorber catalysts with reduced desulfation temperatures, faster desulfation rates and enhanced low-temperature activity. The new generation of catalysts also enabled the potential for PGM thrifting, especially for applications with low engine- out NOx emissions. These PGM thrifted catalysts demonstrated excellent performance after exposure to long-term sulfation/desulfation/thermal aging cycles.
Citation: Chen, H., Mulla, S., Konduru, M., Cox, J. et al., "NOx Adsorber Catalysts with Improved Desulfation Properties and Enhanced Low-Temperature Activity," SAE Technical Paper 2009-01-0283, 2009, https://doi.org/10.4271/2009-01-0283. Download Citation
Author(s):
Hai-Ying Chen, Shadab Mulla, Mahesh Konduru, Julian P. Cox, Paul J. Andersen
Affiliated:
Johnson Matthey Inc
Pages: 7
Event:
SAE World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Diesel Exhaust Emission Control, 2009-SP-2254
Related Topics:
Nitrogen oxides
Environmental regulations and standards
Catalysts
Exhaust systems
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