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- W4302024481 abstract "Ce-doped γ-Fe2O3 catalyst has excellent deNOx and poisoning resistance. However, the NH3-SCR mechanism of improving of Ca poisoning by Ce at atomic level is still unclear. Therefore, the effects of alkali earth metal Ca poisoning on the γ-Fe2O3 (0 0 1) surface and Ce modified Ca-γ-Fe2O3 (0 0 1) surface in the selective catalytic reduction (SCR) of NOx by NH3 were studied. γ-Fe2O3 catalyst poisoned by Ca results from the decrease of surface acidity and the improvement of stable nitrite/nitrate species. Ce brings extra Lewis acid sites for the NH3 adsorption when it is used to modify the poisoned catalyst, which improves the NH3 adsorption and activation. The adsorption of NO and O2 as well as the decomposition of O2 may be inhibited by the presence of Ce. Most of the stable, inactive nitrite/nitrate species are active and decomposed. The production of NH2 is aided by the enhancement of the dehydrogenation process of NH3. This study provides a direction for prolonging the service life of low-temperature Fe-based deNOx catalysts in industrial cement furnaces." @default.
- W4302024481 created "2022-10-06" @default.
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- W4302024481 date "2023-01-01" @default.
- W4302024481 modified "2023-10-16" @default.
- W4302024481 title "Microscopic impact mechanism of alkali earth metal poisoning and Ce modification on the deNOx over the γ-Fe2O3 (0 0 1) surface" @default.
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- W4302024481 doi "https://doi.org/10.1016/j.apsusc.2022.155178" @default.
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