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Revealing the Promotion Effects of Nb on Alkali Resistance of FeVO4/TiO2 Catalysts for NOx Reduction

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Reaction pathway? More adsorption of NH3/NH4 + species and the higher reactivity with gaseous NO maintain the process of E−R reaction path, leading to a satisfactory SCR activity of K poisoned NbFeVOx/TiO2. Whereas the decreased adsorption and reactivity of NH3/NH4 + and NOx restrains the process of L−H reaction path, thus showing inferior SCR activity of K poisoned FeVO4/TiO2.


Abstract

FeVO4-based catalysts with a wide temperature window and high SO2 tolerance have attracted increasing attention for the selective catalytic reduction of NOx with NH3. However, the alkali-resistance of FeVO4-based catalysts is still challenging. In this study, the K-resistance of FeVO4/TiO2 was markedly improved via the Nb modification. It was demonstrated that the adsorption and reactivity of NH3/NH4 + and NOx species on K poisoned FeVO4/TiO2 both decreased, which restrained the process of Langmuir-Hinshelwood reaction path. As a comparison, more adsorption of NH3/NH4 + species and the higher reactivity with gaseous NO maintain the process of Eley-Rideal reaction path, leading to a satisifactory SCR activity. This work demonstrated an effective route to improve alkali-resistance via modulating reactivity and reaction path of adsorbed NH3/NH4 + and NOx species over Nb modified vanadate catalysts, which presented a new point for the development of high-performance alkali-resistant SCR catalysts.

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