Effect of K2O on a Pd-Containing Catalytic Converter for Removing CO and HC Emissions from a Two-Stroke Motorcycle

Chiou Hwang Lee, Yu Wen Chen

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7 Scopus citations


Noble metals (Pt, Pd, and Eh) supported on Al2O3, K2O/Al2O3, CeO2/Al2O3, and K2O/CeO2/Al2O3 were prepared and characterized with respect to surface area, pore volume, and temperature- programmed desorption of CO2. The effects of K2O on the noble-metal catalysts for carbon monoxide and hydrocarbon oxidation were investigated. The reactions were carried out under the stoichiometric and oxygen-deficient conditions. Under the stoichiometric point, the Pd- containing catalysts exhibit higher activity than the Pt-containing catalysts for both CO and C3H6 oxidation. Moreover, Pd/K2O/CeO2/Al2O3 is the most active catalyst among the powder catalysts in this study. Under the oxygen-deficient conditions and in the presence of water, the CO conversions on Pd/Al2O3 and Pd/CeO2/Al2O3 are significantly lower than those on Pt/Al2O3 and Pt/CeO2/Al2O3, respectively. In contrast, the Pd-containing catalysts exhibit higher C3H6 conversion than the Pt-containing catalysts. However, the CO conversions on the Pd-containing catalysts can be promoted by the addition of K2O. On the other hand, the test results of the monolithic catalysts revealed that the CO conversion on PdRh/K2O/Al2O3-CeO2 is quite close to that on PtRh/Al2O3-CeO2 under the simulative gases and the ECE-40 mode driving cycle test. PtRh/Al2O3-CeO2 is the typical composition of catalytic converters for two-stroke motorcycles. It infers that PdRh/K2O/Al2O3-CeO2 is a promising catalytic converter for a two- stroke motorcycle.

Original languageEnglish
Pages (from-to)1260-1266
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Issue number4
StatePublished - 1998


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