Monolithic Catalyst of Ni Foam-Supported MnOx for Boosting Magnetocaloric Oxidation of Toluene

Environ Sci Technol. 2024 Jan 16;58(2):1410-1419. doi: 10.1021/acs.est.3c09541. Epub 2023 Dec 29.

Abstract

Catalytic oxidation has been considered an effective technique for volatile organic compound degradation. Development of metal foam-based monolithic catalysts coupling electromagnetic induction heating (EMIH) with efficiency and low energy is critical yet challenging in industrial applications. Herein, a Mn18.2-NF monolithic catalyst prepared by electrodeposition exhibited superior toluene catalytic activity under EMIH conditions, and the temperature of 90% toluene conversion decreased by 89 °C compared to that in resistance furnace heating. Relevant characterizations proved that the skin effect induced by EMIH encouraged activation of gaseous oxygen, leading to superior low-temperature redox properties of Mn18.2-NF under the EMIH condition. In situ Fourier transform infrared spectroscopy results showed that skin effect-induced activation of oxidizing species further accelerated the conversion of intermediates. As a result, the Mn18.2-NF monolithic catalyst under EMIH demonstrated remarkable performance for the toluene oxidation, surpassing the conventional nonprecious metal catalyst and other reported monolithic catalysts.

Keywords: air pollution control; catalytic oxidation; electromagnetic induction heating; monolithic catalyst; volatile organic compounds.

MeSH terms

  • Catalysis
  • Oxidation-Reduction
  • Oxides* / chemistry
  • Temperature
  • Toluene* / chemistry

Substances

  • Toluene
  • Oxides