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Effects of Sulfate Adsorption on Performance of Diesel Oxidation Catalysts
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Abstract
Several types of oxidation catalyst material are tested in repeated particulate emission measurements over the US HDD transient test procedure. Particulates are effectively reduced in the initial stage of the measurements. However, particulates tend to increase when repeating the measurements. This is believed to be caused by sulfate adsorption on the catalyst surfaces. Hence, oxidation catalysts are tested after stabilizing surface adsorption. Test results show that an oxidation catalyst which forms more sulfates is not effective in reducing particulates because the sulfate increase offsets the SOF reduction effect. An effective catalyst for particulate reduction is developed by suppressing sulfate formation.
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Harayama, N., Niimura, K., and Watanabe, Y., "Effects of Sulfate Adsorption on Performance of Diesel Oxidation Catalysts," SAE Technical Paper 920852, 1992, https://doi.org/10.4271/920852.Also In
References
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- Gill A.P. Design Choices for 1990's Low Emission Diesel Engines SAE Paper 880350 1988
- Horiuchi M. et al Sulfur Storage and Discharge Behavior on Flow-Through Type Oxidation Catalyst SAE Paper 910605 1991
- Arai M. SOF Reduction and Sulfate Formation Characteristics by Diesel Catalyst SAE Paper 910328 1991