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Conversion and Aging Characteristics of Oxidation Catalyst for Natural Gas Vehicle with Lean-burn System  

최병철 (전남대학교 자동차연구소)
윤성식 (전남대학교 대학원)
정종우 (전남대학교 대학원)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.11, no.2, 2003 , pp. 134-139 More about this Journal
Abstract
This study was carried out to investigate the aging and conversion characteristics of oxidation catalysts for a natural gas vehicle with lean-bum system. The conversion of $CH_4$ was observed over the various composition ratio of PMs(Precious metals) and washcoating methods. On the fresh catalysts, Pd affected on the activity of $CH_4$ at low temperature more than other PMs in Pd-only and Rh/Pd/Pt catalysts. The activity at low temperature increased as a mount of Pd increases. On the aged catalysts, the $CH_4$ conversion efficiency of Pd-only catalyst with mono-layer washcoat decreased more than that of the other catalysts of $CH_4$ conversion. It was observed that the thermal durability of Rh/Pd/Pt catalysts with double-layer washcoat was better than the single washcoat catalyst.
Keywords
Natural gas; Oxidation catalyst; PMs(precious metals);
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