Catalytic Reduction of NOx With NH3 Over CeO2 and SiO2 Supported Tungstophosphoric Acid: Promoting Effects of Ceria Support and Cobalt Proton Substitute

Autor:	Jamil Toyir, Abdallah Oulmekki, Imane El Arrouji, Aimery de Mallmann, Kai C. Szeto, Mostafa Taoufik, Cherif Larabi
Rok vydání:	2021
Předmět:	chemistry Inorganic chemistry chemistry.chemical_element Vanadium Selective catalytic reduction General Chemistry Tungsten Dispersion (chemistry) Oxygen Cobalt Catalysis NOx
Zdroj:	Catalysis Letters. 152:2067-2077
ISSN:	1572-879X 1011-372X
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5ece75373bc54f099dbb2357f434ecce https://doi.org/10.1007/s10562-021-03774-7 Zobrazit plný text záznamu Full text from SpringerLink