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- W2320362371 abstract "The alkali metal-induced deactivation of a novel CeO2–WO3 (CeW) catalyst used for selective catalytic reduction (SCR) was investigated. The CeW catalyst could resist greater amounts of alkali metals than V2O5–WO3/TiO2. At the same molar concentration, the K-poisoned catalyst exhibited a greater loss in activity compared with the Na-poisoned catalyst below 200 °C. A combination of experimental and theoretical methods, including NH3-TPD, DRIFTS, H2-TPR, and density functional theory (DFT) calculations, were used to elucidate the mechanism of the alkali metal deactivation of the CeW catalyst in SCR reaction. Experiments results indicated that decreases in the reduction activity and the quantity of Brønsted acid sites rather than the acid strength were responsible for the catalyst deactivation. The DFT calculations revealed that Na and K could easily adsorb on the CeW (110) surface and that the surface oxygen could migrate to cover the active tungsten, and then inhibit the SCR of NOx with ammonia. Hot water washing is a convenient and effective method to regenerate alkali metal-poisoned CeW catalysts, and the catalytic activity could be recovered 90% of the fresh catalyst." @default.
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- W2320362371 date "2012-02-13" @default.
- W2320362371 modified "2023-10-16" @default.
- W2320362371 title "Alkali Metal Poisoning of a CeO<sub>2</sub>–WO<sub>3</sub> Catalyst Used in the Selective Catalytic Reduction of NO<sub><i>x</i></sub> with NH<sub>3</sub>: an Experimental and Theoretical Study" @default.
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- W2320362371 doi "https://doi.org/10.1021/es203619w" @default.
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