Abstract
The catalytic performances of metal-exchanged ZSM5, perovskite and γ-alumina catalysts for the reduction of nitrogen dioxide (NO2) by diesel soot were investigated. The reaction tests were performed through temperature-programmed reaction (TPR), in which NO2 and O2 were passed through a fixed bed of catalyst-soot mixture. On the three types of catalyst, NO2 was reduced to N2 by model soot (Printex-U) and most of the soot was converted into CO2. Pt-, Cu- and Co-exchanged ZSM5 catalysts exhibited reduction activities with conversions of NO2 into N2 of about 20%. Among the perovskite catalysts tested, La0.9K0.1FeO3 showed a 32% conversion of NO2 into N2. The catalytic activities of the perovskite catalysts were largely influenced by the number and stability of oxygen vacancies. For the γ-alumina catalyst, the peak reduction activity appeared at a relatively high temperature of around 500 °C, but the NO2 reduction was more effective than the NO reduction, in contrast to the results of the ZSM-5 and perovskite catalysts.
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This paper is dedicated to Professor Jae Chun Hyun for celebrating his retirement from Department of Chemical and Biological Engineering of Korea University.
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Lee, DW., Song, SJ. & Lee, KY. Reduction of lean NO2 with diesel soot over metal-exchanged ZSM5, perovskite and γ-alumina catalysts. Korean J. Chem. Eng. 27, 452–458 (2010). https://doi.org/10.1007/s11814-010-0075-0
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DOI: https://doi.org/10.1007/s11814-010-0075-0