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Impact of biodiesel impurities on the performance and durability of DOC, DPF and SCR technologies : preprint

Author: Aaron Michael Williams; National Renewable Energy Laboratory (U.S.)
Publisher: Golden, CO : National Renewable Energy Laboratory, [2011]
Series: Conference paper (National Renewable Energy Laboratory (U.S.)), 5400-50297.
Edition/Format:   eBook : Document : Conference publication : National government publication : English
Database:WorldCat
Summary:
An accelerated durability test method determined the potential impact of biodiesel ash impurities, including engine testing with multiple diesel particulate filter (DPF) substrate types, as well as diesel oxidation catalyst (DOC) and selective catalyst reduction (SCR) catalysts. The results showed no significant degradation in the thermo-mechanical properties of a DPF after exposure to 150,000-mile equivalent  Read more...
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Details

Genre/Form: Congresses
Material Type: Conference publication, Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Aaron Michael Williams; National Renewable Energy Laboratory (U.S.)
OCLC Number: 754846934
Notes: Title from title screen (viewed Sept. 27, 2011).
"April 2011."
"To be presented at the SAE 2011 World Congress, Detroit, Michigan, April 12-14, 2011."
Description: 1 online resource (20 pages) : illustrations.
Details: Full text available via Internet in .pdf format. Adobe Acrobat Reader required.
Series Title: Conference paper (National Renewable Energy Laboratory (U.S.)), 5400-50297.
Other Titles: Impact of biodiesel impurities on the performance and durability of diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and selective catalyst reduction (SCR) technologies
Responsibility: Aaron Williams [and others].

Abstract:

An accelerated durability test method determined the potential impact of biodiesel ash impurities, including engine testing with multiple diesel particulate filter (DPF) substrate types, as well as diesel oxidation catalyst (DOC) and selective catalyst reduction (SCR) catalysts. The results showed no significant degradation in the thermo-mechanical properties of a DPF after exposure to 150,000-mile equivalent biodiesel ash and thermal aging. However, exposure to 435,000-mile equivalent aging resulted in a 69% decrease in thermal shock resistance. A decrease in DOC activity was seen after exposure to 150,000-mile equivalent aging, resulting in higher hydrocarbon slip and a reduction in NO2 formation. The SCR catalyst experienced a slight loss in activity after exposure to 435,000-mile equivalent aging. The SCR catalyst, placed downstream of the DPF and exposed to B20 exhaust suffered a 5% reduction in overall NOx conversion activity over the HDDT test cycle. It is estimated that the additional ash from 150,000 miles of biodiesel use would also result in a moderate increases in exhaust backpressure for a DPF. The results of this study suggest that long-term operation with B20 at the current specification limits for alkali and alkaline earth metal impurities will adversely impact the performance of DOC, DPF and SCR systems.

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