Cobalt-manganese composite oxides have high-activity potential for catalytic oxidation of volatile organic compounds (VOCs). However, low defect content and poor oxygen mobility of the spinel structure make it difficult to efficiently activate CH bonds of propane at low-temperature. Herein, novel amorphous Co-Mn binary oxides with enhanced defect were fabricated by a facile self-redox approach. Highly defective amorphous CoMn binary oxides with low-temperature reducibility, weak MnO bond strength and good mobility of the surface lattice oxygen remarkably improved the catalytic activity for propane oxidation. Highly defective amorphous Co₁Mn₃O_x catalyst showed the best catalytic activity for propane mineralization and the T₉₀ was 207℃ under high space velocity (18 000 mL·g⁻¹ h⁻¹). Moreover, in situ spectroscopy technologies were utilized to explore the structure-activity relationship and the degradation mechanism of propane oxidation under real reaction condition. Significantly, as an effective defect engineering strategy, amorphous binary oxides exhibit excellent activity and can provide some enlightenments for developing efficient VOCs catalysts.

钴锰复合氧化物具有高活性，可催化氧化挥发性有机化合物（VOC）。然而，尖晶石结构的低缺陷含量和差的氧迁移率使得难以在低温下有效地活化丙烷的C H键。本文中，通过一种简便的自氧化还原方法制备了具有增强缺陷的新型非晶态Co-Mn二元氧化物。具有低温还原性，弱的Mn O键强度和良好的表面晶格氧迁移率的高缺陷度非晶态Co Mn二元氧化物显着提高了丙烷氧化的催化活性。高度缺陷的非晶态Co ₁ Mn ₃ O _x丙烷矿化催化剂表现出最佳的催化活性，高空速（18 000 mL·g ^-1 h ^-1）下T ₉₀为207℃ 。此外，利用原位光谱技术探讨了在真实反应条件下丙烷的构效关系和降解机理。重要的是，作为有效的缺陷工程策略，无定形二元氧化物表现出出色的活性，可以为开发有效的VOCs催化剂提供一些启示。