Journal
CHEMICAL ENGINEERING JOURNAL
Volume 407, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127082
Keywords
Catalytic wet air oxidation; Ammonia; One-pot synthesis; Ru@TiO2
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Funding
- National Natural Science Foundation of China [21878164, 21978143]
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In this study, a highly dispersed heterogeneous metal catalyst Ru@TiO2 was successfully fabricated and applied in the catalytic wet air oxidation of ammonia. The catalyst showed excellent catalytic performance in reducing ammonia concentration to meet emission standards and adjusting the selectivity of oxidation products. Additionally, the kinetics and mechanism of CWAO of ammonia were studied, providing a theoretical basis for industrial applications.
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 degrees 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.
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