A catalytic NOx reduction system using periodic steps, lean and rich operations |
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Authors: | Tadao Nakatsuji and Veikko Komppa |
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Affiliation: | VTT Chemical Technology, P.O. Box 1401, Espoo FIN-02044, Finland |
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Abstract: | Catalytic lean NO reduction system in periodic two steps, lean/rich operations has been investigated over Rh-based catalysts. The investigation was done using a pulse reaction. In the reaction, after H2 or CO was pulse-injected for a moment to achieve reducing conditions, the highly dispersed Rh catalyst could catalyze NO reduction at 200–400 °C in lean conditions for 1 min. Furthermore, NO was effectively reduced over the highly dispersed Rh/β-zeolite after exposure to the gas composed of 3% of O2, 40 ppm of SO2 and balance of He at 300 and 400 °C for 24 h. |
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Keywords: | NO reduction system Lean and rich operations Rh/β-zeolite |
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