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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70 Scopus citations

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.

Original languageEnglish
Article number122577
JournalJournal of Hazardous Materials
Volume397
DOIs
StatePublished - 5 Oct 2020

Keywords

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

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