Co–H-MFI and Co–silica–alumina catalysts were comparatively characterized and their activities in CH4-SCR and NO oxidation were compared. IR measurements evidence that Co sites distribute between internal cavities and external surface of Co–H-MFI; a large fraction of protonic sites are retained. Co–silica–alumina, unlike Co–H-MFI, is inactive in CH4-SCR and catalyzes only NO oxidation and methane combustion. The CH4-SCR activity is related to Co sites located in the zeolitic cavities. The role of NO2 gas as intermediate in the CH4-SCR reaction appears unlikely. The activity of zeolitic protons in NO oxidation seems negligible in the presence of cobalt.

On the role of external Co sites in NO oxidation and reduction by methane over Co-H-MFI catalysts.

BAGNASCO, GIOVANNI;TURCO, MARIA;
2004

Abstract

Co–H-MFI and Co–silica–alumina catalysts were comparatively characterized and their activities in CH4-SCR and NO oxidation were compared. IR measurements evidence that Co sites distribute between internal cavities and external surface of Co–H-MFI; a large fraction of protonic sites are retained. Co–silica–alumina, unlike Co–H-MFI, is inactive in CH4-SCR and catalyzes only NO oxidation and methane combustion. The CH4-SCR activity is related to Co sites located in the zeolitic cavities. The role of NO2 gas as intermediate in the CH4-SCR reaction appears unlikely. The activity of zeolitic protons in NO oxidation seems negligible in the presence of cobalt.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/204172
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