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A series of CeO2/SiO2 and SixCe1-xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET, XRD, SEM and NH3-TPD techniques. The effects of reaction temperature, CeO2/SiO2 loadings and Si/Ce molar ratio on the granular catalysts for NO selective catalytic reduction with ammonia (NH3-SCR) were studied. Results indicated that both CeO2/SiO2/ATS and CeO2/ATS catalysts showed the same active temperature window of 250-300 oC, mainly depending on the chemical composition of ceria. Moreover, the SixCe1-xO2/ATS catalysts exhibited higher activity and stability than those of CeO2/SiO2/ATS, and the Si0.75Ce0.25O2 represented the highest activity of 88.70% at 300 oC and the broadest active temperature window of 250-400 oC. Furthermore, the NH3-SCR of NO over the SixCe1-xO2 complex oxide catalysts was a result from synergetic catalysis between the acid catalysis and the redox catalysis.
A series of CeO2 / SiO2 and SixCe1-xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET, XRD, SEM and NH3 -TPD techniques. The effects of reaction temperature, CeO2 / SiO2 loadings and Si / Ce molar ratio on the granular catalysts for NO selective catalytic reduction with ammonia (NH3-SCR) were studied. Results indicated both of CeO2 / SiO2 / ATS and CeO2 / ATS catalysts showed the same active temperature window of 250-300 oC, mainly depending on the chemical composition of ceria. Moreover, the SixCe1-xO2 / ATS catalysts exhibited higher activity and stability than those of CeO2 / SiO2 / ATS, and the Si0 .75Ce0.25O2 represented the highest activity of 88.70% at 300 oC and the broadest active temperature window of 250-400 oC. Furthermore, the NH3-SCR of NO over the SixCe1-xO2 complex oxide inhibitors was a result from synergetic catalysis between the acid catalysis and the red ox catalysis.