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- W2024157904 abstract "The decomposition of NO over four Co-containing ZSM-5 zeolites and Pr-, Ga-, and Cu-exchanged ZSM-5 zeolites was investigated using the isotope labeled15N18O and a temperature-programmed desorption (TPD) technique. We found that [Co]-ZSM-5 that contains Co in the framework had the highest activity for NO decomposition (TOF: 2.05×10−3s−1at 442°C and 0.2 vol% NO and 0.8 vol% O2), almost an order of magnitude greater than that previously reported for a zeolite catalyst, namely Cu-ZSM-5 (TOF: 2.27×10−4s−1at 335°C and 0.2 vol% NO and 0.8 vol% O2) obtained under steady-state conditions. The phenomenally high activity of [Co]-ZSM-5 is due to the unique incorporation of Co2+in the siliceous MFI structure. For all the catalysts investigated, co-adsorption of NO and O2led to a substantial increase in the amount of NOxadsorbed. However, the adsorbed species were not necessarily NO2as reported by others. We believe that the interaction between adsorbed NOxspecies and O2is responsible for enhancing the rate of NOxdecomposition. It is obvious that the framework Co2+behaves very differently from Co2+in the countercation position and from extra-framework CoO such as that supported on or dispersed on the surface of silicalite also having the same MFI structure." @default.
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- W2024157904 date "1998-09-01" @default.
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- W2024157904 title "Decomposition of NO over [Co]-ZSM-5 Zeolite: Effect of Co-adsorbed O2" @default.
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- W2024157904 doi "https://doi.org/10.1006/jcat.1998.2170" @default.
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