In this study, a novel niobia-doped ceria nanotubes material (Nb-CeNTs) is synthesized and used as deNO_x catalyst. For comparison, a nanoparticle sample is also obtained by doping CeO₂ nanoparticles with niobia (Nb-CeO₂(N)). The Nb-CeNTs catalyst shows superior NO_x conversion and resistance to alkali metals, phosphorus, and lead than Nb-CeO₂(N) for selective catalytic reduction (SCR) by NH₃. After subjected to a range of characterization techniques, it is found that the enhanced resistance is mainly attributed to the special nanotubular structure of ceria nanotubes, smooth Nb⁵⁺/Nb⁴⁺ and Ce⁴⁺/Ce³⁺ redox cycles, superior redox capacity, and abundant surface Brønsted acidic sites. Moreover, the well-maintained nanotubular structure also accounts for the excellent resistance performance of the Nb-CeNTs catalyst. We foresee that the remarkable chemical properties and self-protection effect of the Nb-CeNTs catalyst may provide a novel approach for the design and synthesis of SCR catalysts to improve the resistance to different kinds of poisons, such as alkali/alkaline earth metals, phosphorus compounds, and heavy metals.

在这项研究中，一种新型的掺杂氧化铌-氧化铈的纳米管材料（铌美分）被合成，并用作DENO _X催化剂。为了比较，还通过用纳米比亚（Nb-CeO ₂（N））掺杂CeO ₂纳米颗粒来获得纳米颗粒样品。将Nb-美分催化剂显示出优异的NO _X转化率和耐碱金属，磷和铅比铌的CeO ₂由NH（N）用于选择性催化还原（SCR）₃。经过一系列表征技术后，发现增强的电阻主要归因于二氧化铈纳米管的特殊纳米管结构，光滑的Nb ⁵⁺ / Nb ⁴⁺和Ce ⁴⁺ / Ce³个^以上的氧化还原循环，卓越的氧化还原容量和丰富的表面Brønsted酸性位点。此外，维护良好的纳米管结构也说明了Nb-CeNTs催化剂的优异抗性。我们预见到，Nb-CeNTs催化剂的卓越化学性能和自保护作用可能为SCR催化剂的设计和合成提供一种新颖的方法，以提高其对各种毒物的抵抗力，例如碱金属/碱土金属，磷化合物和重金属。