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http://dx.doi.org/10.5762/KAIS.2018.19.6.167

Simultaneous Reduction of CH4 and NOx of NGOC/LNT Catalysts for CNG buses  

Seo, Choong-Kil (Department of Automotive & Mechanical Engineering, Howon University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.6, 2018 , pp. 167-175 More about this Journal
Abstract
Natural gas is a clean fuel that discharges almost no air-contaminating substances. This study examined the simultaneous reduction of $CH_4$ and NOx of NGOC/LNT catalysts for CNG buses related to the improvement of the $de-CH_4/NOx$ performance, focusing mainly on identifying the additive catalysts, loading of the washcoat, stirring time, and types of substrates. The 3wt. % Ni-loaded NGOC generally exhibited superior $CH_4$ reduction performance through $CH_4$ conversion, because Ni is an alkaline, toxic oxide, and exerts a reducing effect on $CH_4$. A excessively small loading resulted in insufficient adsorption capacity of harmful gases, whereasa too high loading of washcoat caused clogging of the substrate cells. In addition, with the economic feasibility of catalysts considered, the appropriate amount of catalyst washcoat loading was estimated to be 124g/L. The NOx conversion rate of the NGOC/LNT catalysts stirred from $200^{\circ}C$ to $550^{\circ}C$ for 5 hours showed 10-15% better performance than the NGOC/LNT catalysts mixed for 2 hours over the entire temperature range. The NGOC/LNT catalysts exhibitedapproximately 20% higher $de-CH_4$ performance on the ceramic substrates than on the metal substrates.
Keywords
Catalyst; $CH_4$; Compressed Natural Gas; Metal; NOx; Palladium;
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