Hu, Mian, Li, Zhibing, Huang, Xiaotong, Chen, Meiqi, Hu, Zhong-Ting, Tang, Suqin, Chou, I-Ming, Pan, Zhiyan, Wang, Qi, and Wang, Junliang
To ascertain the reaction variables on o -chloroaniline (o -ClA) mineralization, total nitrogen (TN) removal rate, and N-species distribution, o -ClA was subjected to catalytic supercritical water oxidation (CSCWO) in a fused quartz tube reactor (FQTR). The findings demonstrated that when the temperature, reaction time, and excess oxidant were 400 °C, 90 min, and 150%, respectively, the mineralization rate of o -ClA could reach more than 95%. Moreover, potential degradation pathways of o -ClA in supercritical water oxidation (SCWO) was proposed according to the GC-MS results. TN removal rate is significantly impacted by Ru/rGO, despite the fact that its catalytic effect on the mineralization of o -ClA was not particularly noteworthy. Compared with no catalyst, the TN removal rate of o -ClA obviously increased from 44.1% to 90.3% at 400 °C, 10 wt% Ru loading, 90 min and 200% excess oxidant. In addition, N-species distribution in SCWO and CSCWO were also investigated. Results indicated that the Ru/rGO catalyst could accelerate the oxidation of ammonia-N and convert it to nitrate-N, promoting N 2 generation. Finally, the possible N transformation pathway in CSCWO of o -ClA was proposed. As a result, this work offers fundamental information about o -ClA catalytic oxidation removal in the SCWO process. [Display omitted] • CSCWO of o -ClA was investigated in a FQTR coupled with Raman spectroscopy system. • The potential degradation pathways of o -ClA in SCWO was proposed. • Ru/rGO has a significant effect on the removal rate of TN. • Ru/rGO accelerate the oxidation of ammonia-N to nitrate-N, promoting N 2 generation. • Possible nitrogen transformation pathway in CSCWO of o -ClA was proposed. [ABSTRACT FROM AUTHOR]