Ti₃C₂ MXene with dynamically-generated TiO₂ active site for boosting catalytic oxidative desulfurization has been researched. The two-dimensional Ti₃C₂ MXene, with abundant interface engineering and loosely layered structure, was synthesized through selectively etching of aluminum (Al) layer in Ti₃AlC₂ MAX. The desulfurization activity of Ti₃C₂ MXene is higher than that of bulk Ti₃AlC₂ MAX. Compared with Ti₃AlC₂ MAX, the expanded slit layer provides more pores and cavities to accelerate the mass transfer of the reaction. Also, the excellent dispersion and interfacial affinity are conducive to the further access of MXene with the substrate in diesel. More than 87% of sulfides in real diesel can be removed with Ti₃C₂ MXene as the catalyst. Specifically, the dynamically-generated active sites originate from the continuous activation of molecular oxygen and Ti₃C₂ MXene, which favors the enhance of catalytic activity. Meanwhile, by detecting and analyzing the oxidizing products of various aromatic sulfides, the results show that the MXene interlayers serve as a reaction micro-cavity and are beneficial to the adsorption and removal of the sulfone. This work not only illustrates that MXene can be used in thermally excited catalytic systems, but also provides an example around the construction of dynamically generated active sites to extend the life of the catalyst.

研究了具有动态生成的TiO ₂活性位的Ti ₃ C ₂ MXene，以促进催化氧化脱硫。通过在Ti ₃ AlC ₂ MAX中选择性刻蚀铝层，合成了界面工程丰富，层状结构松散的二维Ti ₃ C ₂ MXene 。Ti ₃ C ₂ MXene的脱硫活性高于块状Ti ₃ AlC ₂ MAX的脱硫活性。与Ti ₃ AlC ₂相比MAX，扩展的狭缝层提供更多的孔和腔，以加速反应的质量转移。同样，出色的分散性和界面亲合力也有助于MXene与柴油中的底物进一步接触。用Ti ₃ C ₂ MXene作为催化剂可以去除实际柴油中超过87％的硫化物。具体而言，动态产生的活性位点源自分子氧和Ti ₃ C ₂的连续活化MXene，有利于增强催化活性。同时，通过检测和分析各种芳族硫化物的氧化产物，结果表明，MXene中间层可作为反应微腔，有利于砜的吸附和去除。这项工作不仅说明MXene可以用于热激发催化体系中，而且还提供了一个围绕动态生成活性位点构造以延长催化剂寿命的示例。