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학술저널
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한국자동차공학회 International journal of automotive technology International journal of automotive technology Vol.8 No.6
발행연도
2007.12
수록면
667 - 674 (8page)

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Various types of NOx storage catalysts for NGV’s were designed, manufactured, and tested in this work on a model gas test bench. As in most of other studies on NOx storage catalyst, alkaline earth metal barium (Ba) was used as the NOx adsorbing substance. The barium-based experimental catalysts were designed to contain different amounts of Ba and precious metals at various ratios. Reaction tests were performed to investigate the NOx storage capacity and the NOx conversion efficiency of the experimental catalysts. From the results, it was found that when Ba loading of a catalyst was increased, the quantity of NOx stored in the catalyst increased in the high temperature range over 350. With more Ba deposition, the NOx conversion efficiency as well as its peak value increased in the high temperature range, but decreased in the low temperature range. The best of de-NOx catalyst tested in this study was catalyst B,which was loaded with 42.8 g/ℓ of Ba in addition to Pt, Pd and Rh in the ratio of 7:7:1. In the low temperature range under 450℃, the NOx conversion efficiencies of the catalysts were lower when CH₄, instead of either C₃H? or C₃H?, was used as the reductant.

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ABSTRACT
1. INTRODUCTION
2. EXPERIMENTAL WORKS
3. RESULTS AND DISCUSSION
4. CONCLUSIONS
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