Volume 8 Issue 6
Dec.  2023
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Article Navigation >  Green Energy&Environment  > 2023  >  8(6): 1654-1663
Yijun Shi, Xiaolin Guo, Yiyan Wang, Fanzhe Kong, Renxian Zhou. New insight into the design of highly dispersed Pt supported CeO2-TiO2 catalysts with superior activity for VOCs low-temperature removal. Green Energy&Environment, 2023, 8(6): 1654-1663. doi: 10.1016/j.gee.2022.03.009
Citation: Yijun Shi, Xiaolin Guo, Yiyan Wang, Fanzhe Kong, Renxian Zhou. New insight into the design of highly dispersed Pt supported CeO2-TiO2 catalysts with superior activity for VOCs low-temperature removal. Green Energy&Environment, 2023, 8(6): 1654-1663. doi: 10.1016/j.gee.2022.03.009
shu

New insight into the design of highly dispersed Pt supported CeO2-TiO2 catalysts with superior activity for VOCs low-temperature removal

doi: 10.1016/j.gee.2022.03.009

  • a. Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou, 310028, China;

  • b. College of Materials and Chemistry, China Jiliang University, Hangzhou, 310018, China

Funds:

This work was supported by a grant from the National Key Research and Development Program of China (2016YFC0204300) and the National Nature Science Foundation of China (21477109).

  • Received date 14 January 2022, Accepted date 25 March 2022, RevRecd date 02 March 2022, Publish date 31 March 2022,
    Abstract
  • 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 n-hexane 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 ℃. 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.

     

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