Effect of support on a catalytic converter for removing CO and HC emissions from a two-stroke motorcycle

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie970296q· OSTI ID:603775

Lee, C H; Chen, Y W ^[1]

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1. National Central Univ., Chungli (Taiwan, Province of China). Dept. of Chemical Engineering

The effect of support on the noble metal catalysts for carbon monoxide and hydrocarbon oxidation was investigated. The reactions were performed under the stoichiometric and oxygen-deficient conditions. Under the stoichiometric point, the activities of the powder catalysts for CO and C{sub 3}H{sub 6} oxidation are in the order Pt/K{sub 2}O/Al{sub 2}O{sub 3} > Pt/Al{sub 2}O{sub 3} > Pt/Al{sub 2}O{sub 3}-SiO{sub 2}, that is, the same as the order of basicity of these catalysts. Under an oxygen-deficient condition, Pt supported on an acidic support, Al{sub 2}O{sub 3}-SiO{sub 2}, exhibits the higher C{sub 3}H{sub 6} conversion and the higher activity for the steam re-forming reaction. In contrast, Pt supported on a basic support, K{sub 2}O/Al{sub 2}O{sub 3}, exhibits the higher CO conversion and the higher activity for the water-gas shift reaction. The order of activity of the powder catalysts for the water-gas shift reaction is the same as the order of basicity of these catalysts. On the other hand, the testing results of the monolithic PtRh-containing catalysts by the simulative gases and the ECE-40 mode driving cycle also reveal the same trend as that of the Pt powder catalysts. Furthermore, the addition of K{sub 2}O on PtRh/Al{sub 2}O{sub 3}-CeO{sub 2} not only increases the basicity of the catalyst but also significantly reduces the CO emission under the ECE-40 mode driving cycle test. Therefore, K{sub 2}O could be a promising additive to a catalytic converter of a two-stroke motorcycle since it can significantly enhance CO conversion.

• OSTI ID: 603775
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 12 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
ALUMINIUM OXIDES
CARBON MONOXIDE
CATALYST SUPPORTS
CATALYTIC CONVERTERS
OXIDATION
PERFORMANCE
PLATINUM
POTASSIUM OXIDES
PROPYLENE
RHODIUM
SHIFT PROCESSES
SILICON OXIDES
STEAM REFORMER PROCESSES