INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Denitrification and Anti-sulfur Activity of Cum-Fen/Ti1-xSnxO2 Composite Catalyst |
TAN Yifeng, ZHANG Ting, ZHANG Yunfei, SUN Qi, TIAN Mengkui*
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Chemistry and Chemical Engineering College, Guizhou University, Guiyang 550025, China |
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Abstract The Ti1-xSnxO2 composite oxide was prepared by co-precipitation method, and a series of Cum-Fen/Ti1-xSnxO2 catalysts were prepared by impregnating active components of CuOx and FeOy with a mass fraction of 10%. The effect of different n(Ti)∶n(Sn) and n(Cu)∶n(Fe) on the NH3-SCR reaction activity of the catalyst was investigated. The results showed that the Ti0.67Sn0.33O2 composite oxide carrier could promote the interaction between the active components CuOx and FeOy. When n(Cu)∶n(Fe) was 3∶1, the conversion rate of NOx reached 91.3% at 300 ℃. Then after 100 ppm of SO2 was introduced into the reaction system for 3 h, the NOx conversion of Cu3-Fe1/Ti0.67Sn0.33O2 decreased by only 2.6%. X-ray photoelectron spectroscopy (XPS), temperature programmed reduction(H2-TPR) and temperature programmed desorption (NH3-TPD and NOx-TPD) showed that the interaction existed between CuOx and FeOy. Compared with Cu/Ti0.67Sn0.33O2 and Fe/Ti0.67Sn0.33O2, the adsorption oxygen concentration on the surface of the composite catalyst increased by 15%~33%, and the total acid amount increased by 56%, which improved the catalyst activity.
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Published: 25 February 2022
Online: 2022-02-28
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Fund:National Key Research and Development Program of China (2018YFC1801706-01), the National Natural Science Foundation of China (21663009), the Science and Technology Support Project of Guizhou Province( [2019]2835, [2021]480). |
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