Arsenic and potassium species were considered as the major poisons for V₂O₅-WO₃/TiO₂ catalyst deactivation. However, their synergistic impacts were rarely reported and the role of anions (Cl⁻, SO₄²⁻ and NO₃⁻) were ignored. Therefore, a series of work were conducted in this research. Results indicated that the co-effect of (As+K) was more serious than the additive effect of single poison. Both physical and chemical properties changes were responsible for this phenomenon. Except for the negative effect of As₂O₃ and K cation, different anions also presented different impacts on catalyst redox ability and ammonia adsorption capacity, which further inhibited NH₃-SCR reactions.

砷和钾物质被认为是V ₂ O ₅ -WO ₃ / TiO ₂催化剂失活的主要毒物。然而，它们的协同影响很少报道和阴离子的作用（CL ^-，SO ₄ ^2-和NO ₃ ^- ）被忽略了。因此，在这项研究中进行了一系列工作。结果表明，（As + K）的协同作用比单一毒物的累加作用更为严重。物理和化学性质的变化都是造成这种现象的原因。除了As ₂ O ₃的负面影响与K阳离子相比，不同的阴离子对催化剂的氧化还原能力和氨吸附能力也有不同的影响，从而进一步抑制了NH ₃ -SCR反应。