CexTi1-xO2 Mixed Oxides Supported CuO Catalyst for NO Reduction by CO
来源期刊：JOURNAL OF RARE EARTHS2003年第3期
论文作者：蒋晓原 周仁贤 吕光烈 楼莉萍 郑小明 陈英旭
Key words：catalitic chemistry; CexTi1-xO2 mixed oxides; CuO/CexTi1-xO2 catalysts; CeTi2O6 phase; NO+CO reaction activity; rare earths;
Abstract: CexTi1-xO2 mixed oxides of different mole ratios (x=0, 0.1, 0.2～0.9, 1.0) were prepared by co-precipitation of TiCl4 with Ce(NO3)3 and then loaded with different amounts of CuO. The effects of CuO on NO+CO reaction were investigated, and the structure and reductive properties of various CuO/CexTi1-xO2 were characterized by the methodologies of BET, TPR and XRD. The results show that different Ce/Ti mole ratios and calcination temperatures induce changes of structure and reductive properties of the CexTi1-xO2 mixed oxides. When x=0.1～0.5, amorphous CeTi2O6 phase mainly forms at 650 ℃ compared to the formation of CeTi2O6 which crystallizes at 800 ℃. When x＞0.6, some TiO2 enters the CeO2 lattice and a CeO2-TiO2 solid solution is formed. The activity of 6%CuO/CexTi1-xO2 calcined at 650 ℃ is largely affected by the x values, which is the highest when x=0.3, 0.4 and 0.9. The NO conversion reaches 70% at a reaction temperature of 150 ℃. By comparison, the x values have little effect on the activity of 6%CuO/CexTi1-xO2 calcined at 800 ℃. There are strong interactions between CuO and CeTi2O6, I.e., formation of the CeTi2O6 phase shifts the CuO reduction peak temperature from 380 to 200 ℃, and CuO, in turn, shifts the CeTi2O6 reduction peak temperature from 600 to 300 ℃.
蒋晓原1，周仁贤1，吕光烈2，楼莉萍4，郑小明1，陈英旭4
(1.Institute of Catalysis, Hangzhou 310029, China;
2.Analysis and Test Center;
3. Zhejiang University, Hangzhou 310029, China;
4.Department of Environment Engineering, Hangzhou 310029, China)
Abstract:CexTi1-xO2 mixed oxides of different mole ratios (x=0, 0.1, 0.2～0.9, 1.0) were prepared by co-precipitation of TiCl4 with Ce(NO3)3 and then loaded with different amounts of CuO. The effects of CuO on NO+CO reaction were investigated, and the structure and reductive properties of various CuO/CexTi1-xO2 were characterized by the methodologies of BET, TPR and XRD. The results show that different Ce/Ti mole ratios and calcination temperatures induce changes of structure and reductive properties of the CexTi1-xO2 mixed oxides. When x=0.1～0.5, amorphous CeTi2O6 phase mainly forms at 650 ℃ compared to the formation of CeTi2O6 which crystallizes at 800 ℃. When x＞0.6, some TiO2 enters the CeO2 lattice and a CeO2-TiO2 solid solution is formed. The activity of 6%CuO/CexTi1-xO2 calcined at 650 ℃ is largely affected by the x values, which is the highest when x=0.3, 0.4 and 0.9. The NO conversion reaches 70% at a reaction temperature of 150 ℃. By comparison, the x values have little effect on the activity of 6%CuO/CexTi1-xO2 calcined at 800 ℃. There are strong interactions between CuO and CeTi2O6, I.e., formation of the CeTi2O6 phase shifts the CuO reduction peak temperature from 380 to 200 ℃, and CuO, in turn, shifts the CeTi2O6 reduction peak temperature from 600 to 300 ℃.
Key words:catalitic chemistry; CexTi1-xO2 mixed oxides; CuO/CexTi1-xO2 catalysts; CeTi2O6 phase; NO+CO reaction activity; rare earths;
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