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Effect of Different Metal Loading on the Structures and Catalytic Oxidation NO Performance of Cr/Al2O3-TiO2 Catalysts |
Author Name | Affiliation | E-mail | WEI Wei | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | | MOU Yi-Meng | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | | LIANG Hong | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | lhong@zghu.edu.cn | LI Shu-Hua | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | | QIAO Zhi-Wei | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | | PENG Feng | Guangzhou Key Laboratory for New Energy and Green Catalysis, College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China | fpeng@zghu.edu.cn |
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Abstract: A series of Cr/Al2O3-TiO2 catalysts were successfully synthesized by the combination of sol-gel method and impregnation method for catalytic oxidation of NO. The effects of Cr load, different metal loading and calcination temperature on the physical-chemical properties of Cr/Al2O3-TiO2 catalysts were exhaustively investigated by using different characterization techniques, such as the temperature programmed oxidation (TPO), X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), N2 adsorption-desorption method and X-ray photoelectron spectroscopy (XPS). The TPO results showed that the 10%(w/w) Cr/Al2O3-TiO2 possessed the highest performance. Compared the doping of different metals, Co-Cr/Al2O3-TiO2 obtained excellent catalytic activity and high specific surface area at 550℃ calcination temperature. H2-TPR show that both the Co loading and calcination temperature can significantly improve the low-temperature redox ability of the catalyst, and be beneficial to form more active species of Cr6+, indicating that Co-Cr has good synergistic catalysis. XPS revealed that the Co doping greatly increased the content of Cr6+, surface adsorbed oxygen (Oβ), and oxygen vacancies. Besides, when the calcination temperature increased (450~550℃), the lattice oxygen continuously moved to the surface of catalyst and increased the ratio of Oβ, leading to the further enhancement of catalytic activity of Co-Cr/Al2O3-TiO2. Based the characterization results and catalytic performance of Cr/Al2O3-TiO2, it is proved that both Cr6+ and Oβ are important active species for the catalytic oxidation of NO. |
Keywords: loading Co-Cr/Al2O3-TiO2 calcination temperature catalytic oxidation NO |
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WEI Wei,MOU Yi-Meng,LIANG Hong,LI Shu-Hua,QIAO Zhi-Wei,PENG Feng.Effect of Different Metal Loading on the Structures and Catalytic Oxidation NO Performance of Cr/Al2O3-TiO2 Catalysts[J].Chinese Journal of Inorganic Chemistry,2019,35(6):978-986. |
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