A series of CeTi samples (CeO₂/TiO₂, TiO₂@CeO₂, TiO₂/CeO₂, and CeO₂@TiO₂) was prepared and modified by tungsten. The 5 %WO₃/TiO₂@CeO₂ (W/[email protected]) catalyst exhibited the best NH₃-SCR performance (NO conversion and N₂ yield above 95 % at 250–500 ºC) due to the synergistic effect of redox ability and acidity. The techniques of XPS, H₂-TPR, and NH₃-TPD were introduced to reveal the effect of Ce³⁺ atom contents, redox properties and acidity on catalytic performance. W/[email protected] shows good redox ability, which is conducive to the low-temperature selective catalytic reduction (SCR) reaction. NH₃-TPD results show that W/[email protected] have a large amount of medium- and strong-strength acids, which are conducive to high-temperature SCR reaction. Therefore, the core-shell catalyst has the optimal synergistic effect of redox property and acidity, which is in favor of the excellent NH₃-SCR performance. Furthermore, the W/[email protected] with a core-shell structure displayed better SO₂ resistance due to the stronger interaction between Ce and Ti.

制备了一系列CeTi样品（CeO ₂ / TiO ₂，TiO ₂ @CeO ₂，TiO ₂ / CeO ₂和CeO ₂ @TiO ₂）并用钨进行了改性。5％WO ₃ / TiO ₂ @CeO ₂（W / [受电子邮件保护]）催化剂表现出最佳的NH ₃ -SCR性能（在250–500ºC下，NO转化和N _2的收率在95％以上），这是由于氧化还原能力和酸度。介绍了XPS，H ₂ -TPR和NH ₃ -TPD技术以揭示Ce ³⁺的作用。原子含量，氧化还原性能和酸度对催化性能的影响。W / [受电子邮件保护]显示出良好的氧化还原能力，这有利于低温选择性催化还原（SCR）反应。NH ₃ -TPD结果表明W / [受电子邮件保护]具有大量的中强度和强强度酸，有利于高温SCR反应。因此，核-壳催化剂具有最佳的氧化还原性质和酸性的协同作用，这有利于优异的NH ₃ -SCR性能。此外，由于Ce和Ti之间更强的相互作用，具有核壳结构的W / [受电子邮件保护]显示出更好的SO ₂抵抗性。