LaFeO3钙钛矿催化剂的制备及其对苯酚的降解处理

摘要采用球磨、溶胶凝胶和共沉淀3种方法制备了LaFeO₃钙钛矿催化剂前驱体,通过改变焙烧温度获得了一系列LaFeO₃钙钛矿催化剂。利用XRD、FT-IR、N₂物理吸脱附、H₂-TPR和XPS等手段对催化剂的结构和性质进行了表征,并考察了其催化湿式空气氧化苯酚性能。结果表明,制备方法对催化性能有较大影响。同时低温还原能力强、氧空位多的催化剂催化活性较高。采用溶胶凝胶法,800 ℃焙烧制备的催化剂的催化活性较好,在反应温度为200 ℃,空气压力为5 MPa,苯酚初始浓度为4 000 mg·L^-1的条件下,最终(240 min) 的COD去除率为95.4%。

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	刘鑫尧
	张宣娇
	王健涛
	张财顺
	韩蛟
	张磊
	高志贤

关键词：钙钛矿苯酚催化湿式氧化 COD去除率

Abstract： LaFeO₃ perovskite catalyst precursors were prepared by ball milling, sol-gel and co-precipitation. A series of LaFeO₃ perovskite catalysts were obtained by changing the calcination temperature. The structure and properties of the catalyst were characterized by XRD, FT-IR, N₂ physical adsorption/desorption, H₂-TPR and XPS, and the catalytic performance of the catalyst for wet air oxidation of phenol was investigated. Preparation method of precursors has great influence on the catalytic performance. At the same time, the low temperature reduction ability and more oxygen vacancies of the catalyst have higher catalytic activity. The catalyst prepared by sol-gel method and calcinated at 800 ℃ has good catalytic activity. Under the conditions of reaction temperature at 200 ℃, air pressure at 5 MPa and initial phenol concentration at 4 000 mg·L^-1, the final COD removal rate (240 min) is 95.4%.

Keywords： perovskite phenol catalytic wet air oxidation COD removal rate

Received 2022-08-25;

Fund:国家自然科学基金(21673270);辽宁省教育厅科学研究经费项目(L2019012)。

Corresponding Authors: 张磊,教授,E-mail:lnpuzhanglei@163.com。 Email: lnpuzhanglei@163.com

About author: 刘鑫尧(1997-),男,硕士研究生,现从事催化新材料及催化反应过程方面的研究。

引用本文:

刘鑫尧, 张宣娇, 王健涛, 张财顺, 韩蛟, 张磊, 高志贤.LaFeO₃钙钛矿催化剂的制备及其对苯酚的降解处理[J]. 化学工业与工程, 2024,41(3): 161-169

LIU Xinyao, ZHANG Xuanjiao, WANG Jiantao, ZHANG Caishun, HAN Jiao, ZHANG Lei, GAO Zhixian.Preparation of LaFeO₃ perovskite catalyst for the degradation of phenol[J]. Chemcial Industry and Engineering, 2024,41(3): 161-169

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