Catalytic ozonation of toluene using Mn-M bimetallic HZSM-5 (M: Fe, Cu, Ru, Ag) catalysts at room temperature

Jihee KIM, Jung Eun LEE, Hyung Won LEE, Jong-Ki JEON, Ji Hyeon SONG, Sang-Chul JUNG, Yiu Fai TSANG, Young-Kwon PARK

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1 Citation (Scopus)

Abstract

We investigated the catalytic efficiency of Mn-based bimetallic oxides in degrading toluene and ozone at room temperature. The room temperature-active bimetallic oxide catalysts were prepared by the addition of Fe, Cu, Ru, and Ag precursors to Mn/HZSM-5. We obtained H₂-temperature-programmed reduction (H₂-TPR) profiles, X-ray diffraction patterns, and X-ray photoelectron spectra to investigate the characteristics of the prepared catalysts. The catalytic efficiency of Mn-based bimetallic oxide catalysts in degrading toluene and ozone at room temperature was mostly improved by the addition of the secondary metals. The prepared bimetallic oxide catalysts, Cu-Mn/HZSM-5, Fe-Mn/HZSM-5, Ru-Mn/HZSM-5, and Ag-Mn/HZSM-5, enhanced efficiency for toluene removal compared to Mn/HZSM-5. The H₂-TPR profiles of the Mn-based bimetallic oxide catalysts showed stronger and broader adsorption-desorption bands at lower temperatures than the profile of Mn/HZSM-5. Additionally, the ratio of the surface defective oxygen over the lattice oxygen on the bimetallic oxide catalysts was higher than that of Mn-only catalysts; the ratio of Mn³⁺ over Mn⁴⁺ was higher for all bimetallic oxide catalysts, as well. Among the bimetallic oxide catalysts, Ru-Mn/HZSM-5 showed the highest efficiency for the removal of toluene to COₓ due to the synergetic effect of the oxidation state and reducible potential at room temperature. Copyright © 2020 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number122577
JournalJournal of Hazardous Materials
Volume397
Early online dateMay 2020
DOIs
Publication statusPublished - 05 Oct 2020

Citation

Kim, J., Lee, J. E., Lee, H. W., Jeon, J.-K., Song, J. H., Jung, S.-C., . . . Park, Y.-K. (2020). Catalytic ozonation of toluene using Mn-M bimetallic HZSM-5 (M: Fe, Cu, Ru, Ag) catalysts at room temperature. Journal of Hazardous Materials, 397. Retrieved from https://doi.org/10.1016/j.jhazmat.2020.122577

Keywords

  • Toluene
  • Ozone
  • Mn bimetallic oxide catalysts
  • HZSM-5
  • Catalytic ozonation

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