The Impacts Of Pd In Bea Zeolite On Decreasing Cold-Start Nmog Emission Of An E85 Fuel Vehicle

SAE INTERNATIONAL JOURNAL OF FUELS AND LUBRICANTS(2018)

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摘要
In the development of hydrocarbon (HC) traps for E85 fuel vehicle emission control, the addition of palladium (Pd) to BEA zeolite was studied for trapping and decreasing cold-start ethanol emissions. BEA zeolite after a laboratory aging at 750 degrees C for 25 hours released nearly all of the trapped ethanol as unconverted ethanol at low temperature, and some ethene was released at a higher temperature by a dehydration reaction. The addition of Pd to BEA zeolite showed a decrease in the release of unconverted ethanol emissions even after the lab aging. The release of methane (CH4), acetaldehyde (CH3CHO), carbon monoxide (CO), and CO2 from Pd-BEA zeolite during desorption (temperature programmed desorption (TPD)) demonstrated that multiple ethanol reaction mechanisms were involved including dehydrogenation and decomposition reactions. The amount of Pd loading in BEA zeolite showed a diminished benefit toward eliminating unconverted ethanol release as the Pd loading increased above 0.2 wt% zeolite. Vehicle emission (with E85 fuel) test results also confirmed the benefits of Pd in zeolite in reducing cold-start non-methane organic gas (NMOG) emissions.
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关键词
Pd catalyst, Zeolite, Cold-start emissions, Cold-start catalyst, Ethanol emissions, HC trap, Flex fuel vehicle emission, Three-way catalyst (TWC)
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