CHEN Shihong¹, TANG Shichang¹, ZHUANG Qingxi^1a, SU Yajing^1a,HUANG Junshi¹, LING Weizhao¹, HUANG Wenjing², CHENG Gao^1,3, LI Yongfeng^1,3

(1a. School of Chemical Engineering and Light Industry; 1b. Key Laboratory of Clean Chemistry Technology of Guangdong Provincial Department of Education Institutions, Guangdong University of Technology, Guangzhou 510006, China;2. Guangdong Lvyuan Environmental Technology Co., Ltd., Meizhou 514700, China;3. Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory (Rongjiang Laboratory), Jieyang 515200, China)

Abstract：With the aggravation of air pollution, the pollution of volatile organic compounds (VOCs) represented by toluene becomes more and more serious. In order to develop an efficient catalyst for toluene catalytic combustion reaction, three Ce_0.7Mn_0.3O₂ samples were prepared by hydrothermal, thermal decomposition and precipitation methods for catalytic combustion of toluene. The three samples were characterized by X-Ray diffraction, the scanning electron microscopy, the transmission electron microscopy, N₂ adsorption-desorption, X-ray photoelectron spectroscopy, H₂ temperature programmed reduction and in-situ infrared spectrometer analysis. The effect of the preparation method on the structure, morphology, chemical properties and catalytic combustion performance of Ce_0.7Mn_0.3O₂ catalyst was investigated. The results show that the three Ce_0.7Mn_0.3O₂ samples exhibit the same shape of nanoparticle. Compared to the other two samples, Ce_0.7Mn_0.3O₂ prepared by the hydrothermal method shows better catalytic activity for the catalytic combustion of toluene due to a more abundant surface Mn³⁺, surface oxygen vacancies and stronger low-temperature reduction. The 90% toluene conversion rate is achieved at 218 ℃. In addition, the sample has excellent stability, and still maintains a high toluene conversion rate (about 90%) after stability test at 218 ℃ for 50 h. In situ FTIR test shows that the catalytic combustion of toluene on the surface of the Ce_0.7Mn_0.3O₂ samples prepared by hydrothermal method follows the Marse-van Krevelen mechanism.

Keywords：cerium manganese solid solution; toluene; catalytic combustion reaction

Get Citation：CHEN S H, TANG S C, ZHUANG Q X, et al. Effect of preparation methods on catalytic performance of cerium manganese solid solution for catalytic toluene combustion[J]. China Powder Science and Technology, 2023, 29(4): 138-149.

DOI：10.13732/j.issn.1008-5548.2023.04.014

Received：2022-11-13,Revised：2023-04-26,Online：2023-06-26 10:14。

Funding Project：国家自然科学基金项目,编号:22278086;广州市基础研究计划基础与应用基础研究项目,编号:202201010373;佛山市促进高校科技成果服务产业发展扶持项目,编号:zc02030000007。

First Author：陈世鸿(1997—),男,硕士研究生,研究方向为环境催化。E-mail: 2406586194@qq.com。

Corresponding Author：程高(1988—),男,讲师,博士,研究方向为环境催化。E-mail: chengg36@gdut.edu.cn。