Selective removal of NO2 in the presence of oxygen and NO over Pd/SiO2 catalysts

M. Li, Kulathuiyer Seshan, Leonardus Lefferts

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Catalytic reduction of NO2 in the presence of excess oxygen and NO has been studied over a 0.2% Pd/SiO2 catalyst between 120 and 260 °C. CO is effective in selective reduction of NO2 at temperatures below 180 °C. Temperature programmed desorption (TPD) and FT-IR studies have been used to investigate the adsorption sites during the reaction conditions. A Langmuir¿Hinshelwood mechanism involving oxidised Pd sites is proposed for the reduction of NO2 with CO, where both reactants adsorb competitively on Pd2+ sites. Cl deactivates the catalyst for the reduction of NO2 with CO. This problem can be overcome by using propylene as a co-reductant. Furthermore, addition of propylene widens the temperature window of operation.
Original languageUndefined
Pages (from-to)143-151
Number of pages9
JournalApplied catalysis B: environmental
Issue number3
Publication statusPublished - 2004


  • IR-49070
  • METIS-221052

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