(569o) Exploring the Promotional Impact of Nb and Mo on Vanadium-Based Catalysts for the Reduction of NOx with NH3

Nitrogen oxides (NOx) contribute to the generation of harmful particulate matter, posing risks to both human health and the environment. A series of VxNbMoTi catalysts has been synthesized with the aim of enhancing the selective catalytic reduction of NO by NH₃ (NH₃-SCR), specifically targeting improved performance at lower temperatures and increased durability against SO₂. In this investigation, Nb and Mo were chosen as promoters for vanadium-based catalysts in SCR reactions, and the incorporation of an appropriate amount of Nb-Mo was found to enhanced activity and SO₂ resistance at lower temperatures. The introduction of Nb-Mo into VTi led to an increase in the overall NH₃ adsorption and enhancement in the Vⁿ⁺ (n = 3, 4) fraction. Moreover, there was an observed increase in both the quantity of oxygen vacancies and labile oxygen. As a result, introducing the optimal Nb-Mo into V not only enhances SCR performance at low temperatures but also aids in improving durability even in the presence of SO₂/H₂O by reducing the affinity between SO₂ and the catalytic surface.