The core-shell Fe₂O₃@TiO₂ and FeTiO_x mixed oxide catalysts were prepared to explore the effect of the core-shell structure on the catalytic oxidation of CO under a high concentration of SO₂. The core-shell structure helped inhibit the sintering of nanoparticles and enabled Fe₂O₃@TiO₂ to share a larger specific surface area, pore size and more active chemisorbed oxygen species than FeTiO_x, promoting the CO catalytic performance. FeTiO_x and Fe₂O₃@TiO₂ reached 84% and 96% conversion efficiency in the flue gas containing 1000 ppm CO at 300 °C. When SO₂ was added to the flue gas, the CO conversion efficiency of FeTiO_x dropped to about 10% after 5 h, while Fe₂O₃@TiO₂ still achieved 60% CO conversion efficiency. The TiO₂ shell of Fe₂O₃@TiO₂ reacted with SO₂ to protect the inner active sites from exposure to SO₂, while the FeTiO_x surface without shell protection was deposited by ferric sulfate and deactivated. Although the amount of sulfate on Fe₂O₃@TiO₂ was larger than that on FeTiO_x, the poor thermal stability of titanic sulfate made it decompose more easily than ferric sulfate. Therefore, the core-shell structure showed a critical role in promoting the resistance to SO₂-poisoning of Fe₂O₃@TiO₂ in CO catalytic oxidation.

制备了核壳Fe ₂ O ₃ @TiO ₂和FeTiO _x混合氧化物催化剂，探讨核壳结构对高浓度SO ₂下CO催化氧化的影响。核壳结构有助于抑制纳米颗粒的烧结，并使Fe ₂ O ₃ @TiO _{2比FeTiO x}具有更大的比表面积、孔径和更活跃的化学吸附氧物种，从而提高CO催化性能。FeTiO _x和 Fe ₂ O ₃ @TiO ₂在 300 °C 含有 1000 ppm CO 的烟气中，转化效率分别达到 84% 和 96%。当烟气中添加SO _{2时，5 h后FeTiO x}的CO转化效率下降至10%左右，而Fe ₂ O ₃ @TiO ₂仍实现60%的CO转化效率。_{Fe 2} O ₃ @TiO 2 的TiO ₂壳与SO 2 发生反应_，以保护内部活性位点不暴露于SO _{2 ，​​而没有壳保护的}FeTiO _x表面则被硫酸铁沉积并失活。_{虽然 Fe 2} O上的硫酸盐量₃ @TiO ₂比FeTiO _x上的大，硫酸钛较差的热稳定性使其比硫酸铁更容易分解。因此，核壳结构在促进Fe ₂ O ₃ @TiO ₂在CO催化氧化中抵抗SO ₂中毒方面发挥着关键作用。