Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 22 Issue 2
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- Pages.205-212
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
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Temperature and exhaust gas conversion efficiency of catalytic converters for natural gas vehicles
천연가스자동차 촉매의 온도분포 및 배기정화 특성
- Published : 1998.02.01
Abstract
Experiments were conducted to investigate the temperature profile and the emissions conversion efficiency of catalytic converters for natural gas vehicles. Two types of the catalyst structure and several transient engine operating conditions were used. The dual-bed catalyst effectively reduced the emissions in a transient period due to the low heat capacity of the front bed. The lanthanoid additives were effective in improving catalyst durability. When the natural gas fueled engine were operated outside of a very narrow window of excess air ratio (from 0.993 to 1.004), the HC and NOx conversion efficiency dropped off. The drop-off were especially fast on the lean side of the window.
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