Ammonia nitrogen wastewater is the most abundant and widely distributed wastewater. In this work, a highly dispersed heterogeneous metal catalyst Ru@TiO₂ was successfully fabricated by a one-pot method for the catalytic wet air oxidation (CWAO) of ammonia. These catalysts were characterized by different techniques, indicating that Ru clusters were dispersed uniformly on the TiO₂ surface, and some Ru atoms were embedded in the TiO₂ framework. This structure can afford excellent catalytic performance, such as 0.5%Ru@TiO₂ catalyst offers a 95.5% conversion under the condition of 2 MPa at 190 °C in 6 h without adding alkali. Ammonia concentration can be reduced from 200 ppm to less than 10 ppm to meet emission standards. And the selectivity of ammonia oxidation products can be adjusted and controlled according to the reaction conditions. Besides, the kinetics and mechanism of CWAO of ammonia were studied, which provided a theoretical basis for its industrial application.

氨氮废水是最丰富，分布最广泛的废水。在这项工作中，通过一锅法成功地制备了高度分散的多相金属催化剂Ru @ TiO ₂，用于氨的催化湿式空气氧化（CWAO）。这些催化剂用不同的技术进行了表征，表明Ru团簇均匀地分散在TiO ₂表面上，并且一些Ru原子嵌入TiO ₂骨架中。这种结构可以提供出色的催化性能，例如0.5%Ru@TiO ₂在190°C和2 MPa的条件下，在6小时内不添加碱，该催化剂的转化率为95.5％。氨气浓度可以从200 ppm降至小于10 ppm，以满足排放标准。氨氧化产物的选择性可以根据反应条件进行调节和控制。此外，研究了氨水CWAO的动力学和机理，为氨水的工业应用提供了理论依据。