A series of H₄SiW₁₂O₄₀-modified Fe₂O₃ catalysts were synthesized using the precipitation method. Over 80% NO_x conversion was obtained in the temperature region of 250–450 °C for the catalysts with the H₄SiW₁₂O₄₀ content of 5% and 10%. The relationship between the physicochemical properties and performances of the series catalysts was established. Abundant acid sites were introduced with doping H₄SiW₁₂O₄₀, which promoted the adsorption of reductant NH₃ on the catalysts at high-temperature regions. Moreover, adding H₄SiW₁₂O₄₀ lowered the amount and reducibility of catalyst surface reactive oxygen species, which inhibited the oxidation of NH₃ to NO_x at higher temperatures to some extent. Thus, most ammonia species were prone to participating in the reaction with NO_x instead of being directly oxidized to NO_x in the higher temperature region over the H₄SiW₁₂O₄₀-decorated catalysts. And it could be concluded that the balance of the acid and redox properties constituted the main reason for the superior activity of the high H₄SiW₁₂O₄₀ content catalysts. Additionally, SO₂ exerted a slight and reversible inhibition effect on the catalyst activity at 300 °C, suggesting that HSiW-modified Fe₂O₃ oxide might be a promising catalyst in practical applications.

利用沉淀法合成了一系列H ₄ SiW ₁₂ O ₄₀改性的Fe ₂ O ₃催化剂。超过80％的NO _X在250-450℃的温度下区域，获得用于与H的催化剂转换₄硅钨酸₁₂ ø ₄₀的5％和10％的内容。建立了系列催化剂的理化性质与性能之间的关系。掺杂H ₄ SiW ₁₂ O ₄₀引入大量的酸位，促进了还原剂NH ₃的吸附。在高温区域的催化剂上。此外，添加H ₄ SiW ₁₂ O ₄₀降低了催化剂表面活性氧的数量和还原性，从而在一定程度上抑制了NH ₃氧化为NO _x。因此，在用H ₄ SiW ₁₂ O ₄₀修饰的催化剂上，大多数氨类倾向于与NO _x参与反应，而不是在较高温度区域被直接氧化成NO _x。可以得出结论，酸和氧化还原性能的平衡是高H高活性的主要原因。₄种SiW ₁₂ O ₄₀含量催化剂。另外，SO ₂对300℃下的催化剂活性具有轻微且可逆的抑制作用，表明HSiW改性的Fe ₂ O ₃氧化物在实际应用中可能是有前途的催化剂。