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

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Li, Mingshi and Seshan, K. and Lefferts, Leon (2004) Selective removal of NO2 in the presence of oxygen and NO over Pd/SiO2 catalysts. Applied Catalysis B: Environmental, 50 (3). pp. 143-151. ISSN 0926-3373

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Abstract: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.
Item Type:Article
Copyright:© 2004 Elsevier B.V.
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/49070
Official URL:http://dx.doi.org/10.1016/j.apcatb.2004.01.001
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