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VOCs Photothermo-Catalytic Removal on MnO x -ZrO 2 Catalysts.
- Source :
- Catalysts (2073-4344); Jan2022, Vol. 12 Issue 1, p85-85, 1p
- Publication Year :
- 2022
-
Abstract
- Solar photothermo-catalysis is a fascinating multi-catalytic approach for volatile organic compounds (VOCs) removal. In this work, we have explored the performance and the chemico-physical features of non-critical, noble, metal-free MnO<subscript>x</subscript>-ZrO<subscript>2</subscript> mixed oxides. The structural, morphological, and optical characterizations of these materials pointed to as a low amount of ZrO<subscript>2</subscript> favoured a good interaction and the ionic exchange between the Mn and the Zr ions. This favoured the redox properties of MnO<subscript>x</subscript> increasing the mobility of its oxygens that can participate in the VOCs oxidation through a Mars-van Krevelen mechanism. The further application of solar irradiation sped up the oxidation reactions promoting the VOCs total oxidation to CO<subscript>2</subscript>. The MnO<subscript>x</subscript>-5 wt.%ZrO<subscript>2</subscript> sample showed, in the photothermo-catalytic tests, a toluene T<subscript>90</subscript> (temperature of 90% of conversion) of 180 °C and an ethanol T<subscript>90</subscript> conversion to CO<subscript>2</subscript> of 156 °C, 36 °C, and 205 °C lower compared to the thermocatalytic tests, respectively. Finally, the same sample exhibited 84% toluene conversion and the best selectivity to CO<subscript>2</subscript> in the ethanol removal after 5 h of solar irradiation at room temperature, a photoactivity similar to the most employed TiO<subscript>2</subscript>-based materials. The as-synthetized mixed oxide is promising for an improved sustainability in both catalyst design and environmental applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734344
- Volume :
- 12
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Catalysts (2073-4344)
- Publication Type :
- Academic Journal
- Accession number :
- 154803821
- Full Text :
- https://doi.org/10.3390/catal12010085