超临界水催化氧化降解邻氨基苯酚

Degradation of o-aminophenol by catalytic oxidation with supercritical water

本实验通过超临界水氧化的方式对邻氨基苯酚进行催化氧化研究。探讨了以浸渍法所制备的CuO/CeO2/γ-Al2O3、Fe2O3/CeO2/γ-Al2O3和Mn2O3/CeO2/γ-Al2O3 3种催化剂对超临界水氧化降解邻氨基苯酚的影响。设计正交实验探究最佳的催化剂的制备方案以进行对邻氨基苯酚的超临界水氧化反应。本实验采用的实验装置为盐浴间歇式超临界水氧化(SCWO)实验装置、通过浸渍焙烧的材料作为超临界水氧化的催化剂,氧气作为实验的氧化剂,并以化学需氧量(COD)去除率反映超临界水氧化效果,本次实验通过催化剂Mn2O3/CeO2/γ-Al2O3的COD降解效果最佳,达到71.42%,比无催化剂的超临界水氧化降解效果提升33.6%。通过X线衍射(XRD)、扫描电子显微镜(SEM)分析发现Mn2O3有着良好的热稳定性,有助于提升良好的热稳定性。

The catalytic oxidation of o-aminophenol was studied by means of supercritical water oxidation(SCWO). The effects of CuO/CeO2/γ-Al2O3, Fe2O3/CeO2/γ-Al2O3 and Mn2O3/CeO2/γ-Al2O3 catalysts prepared by impregnation on the degradation of o-aminophenol by supercritical water were investigated. Orthogonal experiments were designed to explore the optimal catalyst preparation scheme for the oxidation of o-aminophenol with supercritical water. The experimental device used in this experiment was salt bath intermittent SCWO experimental device. The impregnated material was used as the catalyst for supercritical water oxidation, and oxygen was used as the oxidant. The removal rate of chemical oxygen demand(COD)was used to reflect the effect of supercritical water oxidation. Finally, the COD degradation effect using the catalyst of Mn2O3/CeO2/γ-Al2O3 was the best, reaching 71.42%, which was 33.6% higher than that of the catalyst-free supercritical water. Through X-ray diffraction(XRD) and scanning electron microscope(SEM)analysis showed that Mn2O3 had good thermal stability, which was helpful to improve the thermal stability.