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• W2019862778 abstract "Abstract The effects of different synthesis conditions for MFI and the different locations of Co 2+ on MFI on the catalyst properties for the selective catalytic reduction of NO by C 3 H 8 [C 3 H 8 –SCR] in the presence of excess oxygen were investigated, and the nature of Co 2+ was characterized by XRD, FTIR, H 2 -TPR, XPS, and DTG. H 2 -TPR shows that the exchanged Co ions in MFI are nonreducible even at 750 °C, while the reduction temperature of incorporated Co is at 690 °C. Three types of DTG peaks, which correspond to different temperatures for the thermal decomposition or disassociation of TPA, are observed in the differential thermogravimetric (DTG) analysis of the as-synthesized MFI prepared under different conditions, and are related well to C 3 H 8 –SCR of NO for three different types of Co sites in MFI: incorporated Co 2+ site and two different exchanged Co 2+ sites, respectively. The incorporated Co 2+ in MFI with the DTG peak temperature at 418 °C is almost inactive for C 3 H 8 –SCR of NO. For the Co 2+ -exchanged MFI, the sample with a low Co 2+ -exchange degree has a higher TOF for NO reduction than that having a higher Co 2+ -exchange degree, indicating that at least two types of Co 2+ sites exist in the Co 2+ -exchanged MFI sample. The corresponding DTG peak temperatures located at 455 and 481 °C show two types of exchanged Co ion sites having different surface energies for different activities for SCR of NO, with the Co 2+ site with higher surface energy having higher specific catalytic activity for NO reduction. The exchange degree and position of Co 2+ depend on the alkalinity of the hydrothermal synthesis condition and the sodium content of the resulting Co 2+ -exchanged MFI." @default.
• W2019862778 created "2016-06-24" @default.
• W2019862778 creator A5027922831 @default.
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• W2019862778 date "2004-01-01" @default.
• W2019862778 modified "2023-09-23" @default.
• W2019862778 title "SCR of lean NOx with C3H8 over Co/MFI catalysts: dependence on synthesis condition of MFI and Co location" @default.
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• W2019862778 doi "https://doi.org/10.1016/j.jcat.2003.07.008" @default.
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