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- Title
Catalytic Reduction of NOx With NH<sub>3</sub> Over CeO<sub>2</sub> and SiO<sub>2</sub> Supported Tungstophosphoric Acid: Promoting Effects of Ceria Support and Cobalt Proton Substitute.
- Authors
El Arrouji, Imane; Toyir, Jamil; Larabi, Cherif; Szeto, Kai C.; de Mallmann, Aimery; Taoufik, Mostafa; Oulmekki, Abdallah
- Abstract
Grafted tungstophosphoric acid (H3PW12O40/ HPW) is applied as a catalyst in the selective catalytic reduction of NOx with NH3 (NH3-SCR). The HPW/CeO2 catalyst has been found to be effective in the SCR reaction compared to HPW/SiO2. The cobalt-exchanged HPW/CeO2 improved NOx conversion, which reached 98% over a wide operating temperature window (280–500 °C). The better NOx performance of the CoPW/CeO2 catalyst is mainly due to the higher dispersion of tungsten on the CeO2 support, the formation of oxygen vacancies and the production of nitrogenous species. Incorporation of vanadium decreased the acidity of HPW, which reduced SCR activity on the HPVW/CeO2 catalyst.
- Subjects
CERIUM oxides; CATALYTIC reduction; COBALT; PROTONS; VANADIUM; WATER gas shift reactions; ACIDS
- Publication
Catalysis Letters, 2022, Vol 152, Issue 7, p2067
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-021-03774-7