A novel catalyst of silicon cerium complex oxides for selective catalytic reduction of NO by NH3
来源期刊：Journal of Rare Earths2010年第5期
论文作者：徐海涛 沈岳松 邵成华 林福文 祝社民 丘泰
文章页码：721 - 726
摘 要：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.
徐海涛1，沈岳松2，邵成华2，林福文2，祝社民2，丘泰2
1. School of Energy & Environment, Southeast University2. College of Materials Science and Engineering, Nanjing University of Technology
摘 要：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.
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