| Autor: |
Yijun Shi, Xiaolin Guo, Yiyan Wang, Fanzhe Kong, Renxian Zhou |
| Předmět: |
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| Zdroj: |
Green Energy & Environment; Dec2023, Vol. 8 Issue 6, p1654-1663, 10p |
| Abstrakt: |
A series of CeO2-TiO2 mixed oxides supports with various Ce/Ti molar ratio were synthesized by modified coprecipitation method. The corresponding Pt loaded (0.5 wt% Pt) catalysts were prepared by electronless deposition method and evaluated for the deep oxidation of nhexane as a model VOCs. The results show that the CeO2 and TiOx nanoparticles can highly disperse into each other and form Ce2Ti2O7 solid solution with appropriate Ce/Ti molar ratio, which significantly improves their redox ability by enhancing the interaction between CeO2 and TiOx. The dispersibility of Pt species can also be adjusted by altering the Ce/Ti molar ratio, and Pt/CeTi-2/1 catalyst with Ce/Ti molar ratio of 2:1 exhibits the best Pt dispersibility that Pt species mainly exist as Pt single atoms. The high dispersion of Pt species in the Pt/CeO2-TiO2 catalysts would promote the catalytic activity of VOCs oxidation with low T90% values (1000 ppm, GHSV = 15,000 h-1), such as for n-hexane degradation with T90% of 139 °C. The characterizations reveal that the superior activity is mainly related to possessing the more Pt2+ species, adsorbed oxygen species and higher low-temperature reducibility owing to the strong interaction between highly dispersed Pt species and CeO2-TiO2 as well as the promoted migration of lattice oxygen by the formation of more Ce2Ti2O7 species. Furthermore, the Pt/CeTi-2/1 catalyst also exhibits excellent stability for chlorinated and other non-chlorinated VOCs oxidation, making it very promising for real application under various operating conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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