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• W1974463089 abstract "Co/ZSM-5 catalysts were prepared by several methods, including wet ion exchange (WIE), its combination with impregnation (IMP), solid state ion exchange (SSI) and sublimation (SUB). FTIR results show that the zeolite protons in H-ZSM-5 are completely removed when CoCl2 vapor is deposited. TPR shows peaks for Co2+ ions at 695–705°C and for Co3O4 at 385–390°C, but a peak in the 220–250°C region appears to indicate Co2+ oxo-ions. The catalysts have been tested for the selective reduction of NOx with iso-C4H10 under O2-rich conditions and in the absence of O2, both with dry and wet feeds. A bifunctional mechanism appears to operate at low temperature: oxo-ions or Co3O4 clusters first oxidize NO to NO2, which is chemisorbed as NOy (y≥2) and reduced. In this modus operandi catalyst SUB shows the highest N2 yield ∼90% near 390°C for dry and wet feeds. It is found to be quite stable in a 52 h run with a wet feed. In contrast, the WIE catalyst, which mainly contains isolated Co2+ ions and has poor activity below 400°C, excels at T>430°C. This and the observation that, at high temperature, NO is reduced in O2-free feeds over Co/MFI catalysts, suggest that NO can be reduced over Co2+ ions without intermediate formation of NO2. The bifunctional mechanism at low temperature is supported by the fact that a strongly enhanced performance is obtained by mixing WIE with Fe/FER, a catalyst known to promote NO2 formation." @default.
• W1974463089 created "2016-06-24" @default.
• W1974463089 creator A5044936528 @default.
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• W1974463089 date "2000-06-05" @default.
• W1974463089 modified "2023-10-14" @default.
• W1974463089 title "Catalytic reduction of NOx by hydrocarbons over Co/ZSM-5 catalysts prepared with different methods" @default.
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• W1974463089 doi "https://doi.org/10.1016/s0926-3373(00)00125-9" @default.
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