Selective catalytic reduction of NOx with propylene in the presence of oxygen over Co-Pt promoted H-MFI and HY

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Maisuls, S.E. and Lefferts, L. and Seshan, K. and Furusawa, T. and Aika, K. and Mosqueda-Jimenez, B. and Smidt, M.L. and Lercher, J.A. (2003) Selective catalytic reduction of NOx with propylene in the presence of oxygen over Co-Pt promoted H-MFI and HY. Catalysis Today, 84 (3-4). pp. 139-147. ISSN 0920-5861

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Abstract:Kinetic and in situ spectroscopic studies of Co¿Pt/MFI and Co¿Pt/HY catalysts for the selective reduction of NOx with propylene in the presence of oxygen were carried out. The results of catalytic tests of Co¿Pt/MFI showed that the addition of Pt to Co based catalyst improved the activity, but a small increase in selectivity to N2O (15¿20%) was observed. In the case of Co¿Pt/HY catalyst, the addition of Pt improved the activity more significantly and however, a larger increase in selectivity to N2O (6¿72%) was obtained. It was also found from the results of FT-IR studies of Co¿Pt/MFI that the reduction of NO to N2 was as follows: firstly the oxidation of NO to NO2 occurred over metallic Pt and NO2 forms Co¿NO2, Co¿ONO, and/or Co¿ONO2; secondly, the partial oxidation of C3H6 was happened over Brønsted acid sites and the reaction of NO2 formed on Co sites with partial oxidized C3H6 produced organo-nitro species. These species were dehydrated and isomerized to form isocyanate. Finally, [NCO] type intermediates react with NO from gas phase to selectively yield N2.
Item Type:Article
Copyright:© 2003 Elsevier B.V.
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/40706
Official URL:http://dx.doi.org/10.1016/S0920-5861(03)00267-0
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