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• W2120979040 abstract "Catalytic converters have become a viable post-treatment system for reducing emissions from on-highway diesel engines. This investigation attempted to develop and test a catalyst (copper ion-exchanged ZSM-5 zeolite) system for its ability to effectively treat diesel exhaust gas. During the first phase of this investigation [University Transportation Center for Alabama (UTCA) project 02201], catalyst/zeolites were used in a laboratory scale plug flow reactor system to treat sysnthetic diesel exhaust gas maintaining operating temperature at 200-300°F (93.3-148.9°C), pressures at 6 and 12 psig, and the space velocity through the reactor at ~8000 hr supra -1. The exhaust gas composition was monitored before and after passing through the catalyst system using gas chromatography techniques. Despite relatively low operating temperature, the hydrocarbons (particularly methane) removal efficiency was fairly good, ranged from 30% to 80% depending upon the variation in the composition of the catalyst samples/zeolite structures. Therefore, this catalyst system seemed promising for large reduction of hydrocarbons from the diesel exhaust. Two modified catalysts were prepared which involved incorporating CeO2 and ZrO2 as the external coating on the previously made Cu-ZSM-5 catalysts. The size and shape of new catalysts were changed to help minimize pressure drop as well as catalyst loss from the system at high back pressure. The conversion efficiency of methane was tested using both catalysts for temperatures in the range from 200 to 800°F (93.3-426.7°C) at four different space velocities (ranging from ~ 10,000 to ~25,000 hr supra -1) and the conversion efficiency of butane was tested at the same temperature range and the space velocity of ~30,000 hr supra -1. The new catalysts showed very good performance for hydrocarbon conversion and efficiencies up to 100% were achieved. Results of removal of synthetic diesel fuel (using methane and butane gas separately) for two different catalysts at different operating conditions are presented to support the conclusions of this research work. A sample of the developed catalyst was delivered to the University of Alabama Internal Combustion Engines lab and tested by passing diesel engine exhaust through a canister containing the catalyst. The eight engine test conditions used were identified to simulate the federal medium and heavy duty diesel test cycles. Exhaust hydrocarbon reductions from 6 to 25% were measured, with an overall weighted average of 16% reduction, for canister space velocities of about 19,300 hr supra -1 for canister temperatures of 325-350°C (617-662°F)." @default.
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• W2120979040 date "2006-05-23" @default.
• W2120979040 modified "2023-09-27" @default.
• W2120979040 title "Diesel Exhaust Treatment Using Catalysts/Zeolites-II" @default.
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