This study focused on promotional effect of Sb₂O₅ and Nb₂O₅ addition to V-SCR on decomposition of NH₄HSO₄, reactivity of NH₄HSO₄ and NO, and sulfur resistance. Adding Sb₂O₅ and Nb₂O₅ increased the electron cloud density around the S atoms in SO₄²⁻, which exerted a positive effect on the transformation of SO₄²⁻ to SO₂ in the lower temperature region. As a result, the decomposition behavior of NH₄HSO₄ was obviously enhanced on the promoters-modified catalysts. Meanwhile, a high reactivity of NH₄HSO₄ with NO was observed with the introduction of Sb₂O₅ and Nb₂O₅, which could be explained by the increased amount of V⁵⁺ and reactive electrophilic oxygen species on the Sb₂O₅- and Nb₂O₅-doped catalyst surfaces. Finally, the deactivation of catalysts by SO₂ and H₂O was impeded in a certain extent through introducing Nb₂O₅ and Sb₂O₅, suggesting that these promoters-modified catalysts might be typically used in the low-temperature SCR systems in the future.

这项研究的重点是在V-SCR中添加Sb ₂ O ₅和Nb ₂ O ₅对NH ₄ HSO _4的分解，NH ₄ HSO ₄和NO的反应性以及耐硫性的促进作用。Sb ₂ O ₅和Nb ₂ O _5的添加增加了SO ₄ ^2-中S原子周围的电子云密度，对低温区域中SO ₄ ^2-向SO ₂的转化产生了积极影响。结果，NH ₄ HSO的分解行为在促进剂改性的催化剂上，₄明显增强。同时，通过引入Sb ₂ O ₅和Nb ₂ O ₅可以观察到NH ₄ HSO ₄与NO的高反应性，这可以通过Sb ₂ O上V ⁵⁺和反应性亲电性氧含量的增加来解释。₅和Nb ₂ O ₅掺杂的催化剂表面。最后，通过引入Nb ₂ O ₅和Sb ₂在一定程度上阻止了SO ₂和H ₂ O对催化剂的失活。O ₅，表明这些促进剂改性的催化剂将来可能会典型地用于低温SCR系统中。