Two kinds of magnetic iron oxides (Fe₂O₃-PO and Fe₂O₃-AO) are synthesized via the solution combustion coupled with the chemical oxidization of hydrogen peroxide. The magnetic carbon-containing Fe₂O₃-AO obtained at the absence of air presents the main γ-Fe₂O₃ crystal with smaller crystallite size and larger BET surface area, but not the aggregated and sintered α-Fe₂O₃ crystal of Fe₂O₃-PO. The doping of tungsten has no effect on the growth of α-Fe₂O₃ in Fe₂O₃-PO during the annealing process at 400 °C. However, the doping of tungsten effectively restrains the irreversible transformation of γ-Fe₂O₃ into α-Fe₂O₃ crystal and enhances the anti-collapse of the pore structure of Fe₂O₃-AO under the same annealing process at 400 °C by inducing a stronger interaction between tungsten species and γ-Fe₂O₃ crystal. In addition, the doping of tungsten improves the ratio of surface adsorbed oxygen, the Fe²⁺/(Fe²⁺+Fe³⁺) ratio and the surface acidity of Fe₂O₃-PO-400 and Fe₂O₃-AO-400. Therefore, the doping of tungsten promotes the catalytic performance of Fe₂O₃-PO-400, especially its high-temperature activity, but exhibits a better promotional effect on the low-temperature activity of Fe₂O₃-AO-400. Magnetic 5W/Fe₂O₃-AO-400 shows the highest BET surface area, the largest Fe²⁺/(Fe²⁺+Fe³⁺) ratio, the strongest surface acidity and the appropriate redox ability compared with the other tested catalysts, thus exhibits the highest low-temperature NH₃-SCR activity and better resistance to SO₂ and H₂O than 5W/Fe₂O₃-PO-400. The formation of low crystallinity and high dispersive γ-Fe₂O₃ is an important reason on the good catalytic performance of magnetic 5W/Fe₂O₃-AO-400, which is also confirmed by the influence of annealing temperature. Furthermore, the results of steady-state kinetic experiments demonstrate that the 5W/Fe₂O₃-AO-400 catalyst mainly follows the Eley-Rideal mechanism.

通过固溶燃烧和过氧化氢的化学氧化，合成了两种磁性氧化铁（Fe ₂ O ₃ -PO和Fe ₂ O ₃ -AO）。铁磁性含碳₂ ö ₃ -AO在没有空气的礼物的主γ-获得的Fe ₂ ö ₃晶体具有更小的晶粒尺寸和更大的BET表面积，而不是聚集的和烧结的α-Fe ₂ ö ₃晶体Fe ₂ O ₃ -PO的含量。钨的掺杂对的生长没有影响的α-Fe ₂ ö ₃中的Fe ₂在400°C的退火过程中O ₃ -PO。然而，钨的掺杂有效地抑制的不可逆变换了γ-Fe ₂ ö ₃成的α-Fe ₂ ö ₃结晶和增强Fe的孔结构的防塌₂ ö ₃在400相同的退火工艺下-AO ℃，通过诱导钨物种和γ-铁之间更强的相互作用₂ ö ₃晶体。另外，钨的掺杂改善了表面吸附氧的比率，Fe ²⁺ /（Fe ²⁺ + Fe ³⁺）的比率以及Fe ₂ O ₃的表面酸度。-PO-400和Fe ₂ O ₃ -AO-400。因此，钨的掺杂促进Fe的催化性能₂ ö ₃ -PO-400，特别是其高温活性，但显示出对Fe的低温活性更好的促销效果₂ ö ₃ -AO-400。与其他测试催化剂相比，磁性5W / Fe ₂ O ₃ -AO-400具有最高的BET表面积，最大的Fe ²⁺ /（Fe ²⁺ + Fe ³⁺）比，最强的表面酸度和适当的氧化还原能力，因此表现出最高的低温NH ₃ -SCR活性和更好的抗SO₂和H ₂ O比5W / Fe ₂ O ₃ -PO-400高。低结晶度和高色散γ-Fe的形成₂ ö ₃是上的磁性5W / Fe的良好的催化性能的一个重要原因₂ ö ₃ -AO-400，其也通过退火温度的影响证实。此外，稳态动力学实验的结果表明，5W / Fe ₂ O ₃ -AO-400催化剂主要遵循Eley-Rideal机理。