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Research on NO and SO2 removal using TiO2-supported iron catalyst with vaporized H2O2 in a catalytic oxidation combined with absorption process.
- Source :
- Environmental Science & Pollution Research; May2020, Vol. 27 Issue 15, p18329-18344, 16p
- Publication Year :
- 2020
-
Abstract
- Simultaneous removal of NOx and SO<subscript>2</subscript> is carried out by an oxidation-absorption process, which NO oxidized by active hydroxyl radicals (·OH) derived from catalytic decomposition of vaporized H<subscript>2</subscript>O<subscript>2</subscript> over Fe<subscript>3</subscript>O<subscript>4</subscript>/TiO<subscript>2</subscript> and then adsorbed by NaOH solution along with SO<subscript>2</subscript>. Fe<subscript>3</subscript>O<subscript>4</subscript>/TiO<subscript>2</subscript> synthesized by wet impregnation method with an additional reduction under H<subscript>2</subscript> atmosphere was characterized by XRD, FTIR, BET, XPS, and VSM analysis. Effects of H<subscript>2</subscript>O<subscript>2</subscript> concentration, H<subscript>2</subscript>O<subscript>2</subscript> injection rate, reaction temperature, gas flow rate, and flue gas component on simultaneous removal were investigated. The experimental results show that NO can be effectively oxidized by highly reactive ·OH radicals generated from H<subscript>2</subscript>O<subscript>2</subscript> decomposition over Fe<subscript>3</subscript>O<subscript>4</subscript>/TiO<subscript>2</subscript> catalyst, and removal efficiencies of 93.31% for NO, 85.90% for NOx, and 100% for SO<subscript>2</subscript> were obtained. The surface zero-valent iron (Fe<superscript>0</superscript>) and divalent iron (Fe<superscript>2+</superscript>) are the key factors of the catalytic oxidation with hydroxyl radical. H<subscript>2</subscript>O<subscript>2</subscript> adsorption and dissociation mechanism on catalyst surface was studied using DFT calculation. The calculation results demonstrate that H<subscript>2</subscript>O<subscript>2</subscript> prefers to dissociate on iron containing surface, and ·OH radicals generation follow by Haber-Weiss (H–W) mechanism. The stable oxidative product of HNO<subscript>2</subscript> and HNO<subscript>3</subscript> were generated through NO/NO<subscript>2</subscript> and H<subscript>2</subscript>O<subscript>2</subscript> co-adsorption on the FeO/TiO<subscript>2</subscript> (0 0 1) surface. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09441344
- Volume :
- 27
- Issue :
- 15
- Database :
- Complementary Index
- Journal :
- Environmental Science & Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 143094499
- Full Text :
- https://doi.org/10.1007/s11356-020-08042-6