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| 固定床中γ-Al2O3负载金属氧化物催化臭氧性能研究 |
| Catalytic ozonation by metal oxides supported on γ-Al2O3 in continuous fixed-bed reactor |
| 投稿时间：2019-04-11 修订日期：2019-05-20 |
| DOI： |
| 中文关键词: 非均相催化臭氧氧化 固定床 金属氧化物 γ-Al2O3 |
| 英文关键词: Heterogeneous catalytic ozonation fixed bed metal oxides γ-Al2O3 |
| 基金项目:国家自然科学基金资助项目(21590813)；辽宁省兴辽英才计划项目资助（XLYC1801003） |
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| 中文摘要: |
| 非均相催化臭氧氧化技术是一种高效的废水处理技术,但目前非均相臭氧催化剂主要为粉体形态,常用于静态或半连续态反应器中,其于固定床中的催化性能并不明确。本实验设计了连续态固定床反应体系,以γ-Al2O3颗粒为载体,Mn、Fe、Ce的氧化物为活性组分制备负载型催化剂,并以对硝基苯酚(PNP)为目标污染物,探究其在不同工艺条件下的催化性能。实验结果表明,负载CeO2的催化剂催化效果最好；化学需氧量(COD)和总有机碳(TOC)的去除率随着活性组分CeO2负载量、水力停留时间(HRT)、气相O3浓度的增加而增加；当负载量为12.6 wt%、HRT为15 min、气相O3浓度为16.2 mg/L时,6 h平均COD和TOC去除率分别达到86.3%和91.7%,；此外,该体系在pH 5.0-9.0范围内均表现出良好催化性能,并具有良好的长时间运行能力。 |
| 英文摘要: |
| Heterogeneous catalytic ozonation is an efficient technology in water treatment. However, most of the researches are focused on powder catalysts and operated in static or semi-continuous reactors, which are impractical in real application. Herein, continuous fixed bed reaction system with γ-Al2O3 pellets as carrier and Mn/Fe/Ce oxide as active components was designed. Its catalytic performance was determined in different conditions with p-nitrophenol as a model pollutant. Results show that among the three supported catalysts and γ-Al2O3 carrier, CeO2/γ-Al2O3 shows the best catalytic performance. Moreover, COD and TOC removal efficiency is increased with the increase of CeO2 loading content, HRT or O3 concentration. With loading content of 12.6 wt%, HRT of 15 min and O3 concentration of 16.2 mg/L, the COD and TOC removal efficiency reaches to 86.3% and 91.7%, respectively. Moreover, the catalyst shows good catalytic performance under a wide pH range of 5.0-9.0 and the catalytic performance of this system remains stable during a long running time of 30 h. |
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