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Conversion Efficiency of Catalyst for Lean-bum Natural Gas Vehicles with Steady and Unsteady State Temperature Change  

Cho Byung-Chul (Automobile Research Center, Chonnam National University)
Juhng Woo-Nam (Automobile Research Center, Chonnam National University)
Piao Fengai (Graduate School of Mechanical Engineering, Chonnam National University)
Lee Choon-Hee (Graduate School of Mechanical Engineering, Chonnam National University)
Lee Jang-Hee (Engine R&D Group)
Yun Jeong-Eui (Samcheok National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.3, 2005 , pp. 123-130 More about this Journal
Abstract
In this study, we evaluated the CH4 and CO conversion efficiencies over the oxidation catalysts for natural gas vehicle with lean-burn system. On the fresh catalyst, the conversion efficiency was increased when the loading of precious metal was increased. On the aged catalyst, the conversion efficiency was decreased as increasing the excess air ratio. We could confirm the measuring conversion efficiency of the unsteady state with the FTIR and that of steady state with the GC The temperature increasing ratio of unsteady state is acceptable from 3$^{\circ}C$/min. to 15$^{\circ}C$/min. for the evaluation of catalyst conversion performance , which has within the 4$\%$ of the difference of conversion efficiency. We observed a physical behavior of the thermal aged catalyst's surface using TEM and BET device. It was found that the precious metal was grown to the micro-scopic size by thermal aging process.
Keywords
천연가스자동차;귀금속;비정상상태온도;
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Times Cited By KSCI : 1  (Citation Analysis)
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