CIESC Journal ›› 2023, Vol. 74 ›› Issue (6): 2447-2457.DOI: 10.11949/0438-1157.20230196

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Preparation of Mn3O4 catalyst by redox method and study on its catalytic oxidation performance and mechanism of toluene

Chen WANG1(), Xiufeng SHI2, Xianfeng WU1, Fangjia WEI2, Haohong ZHANG1, Yin CHE1, Xu WU2()   

  1. 1.College of Chemical Engineering and Technology, Taiyuan University of Technology,Taiyuan 030024, Shanxi, China
    2.College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2023-03-06 Revised:2023-06-13 Online:2023-07-27 Published:2023-06-05
  • Contact: Xu WU

氧化还原法制备Mn3O4催化剂及其甲苯催化氧化性能与机理研究

王辰1(), 史秀锋2, 武鲜凤1, 魏方佳2, 张昊虹1, 车寅1, 吴旭2()   

  1. 1.太原理工大学化学工程与技术学院,山西 太原 030024
    2.太原理工大学化学学院,山西 太原 030024
  • 通讯作者: 吴旭
  • 作者简介:王辰(1998—),男,硕士研究生,2417775431@qq.com
  • 基金资助:
    国家自然科学基金项目(51978436);山西省应用基础研究计划项目(20210302123118)

Abstract:

The Mn3O4 catalyst was synthesized by controlling the calcination temperature and atmosphere based on the redox method for the preparation of α-MnO2. Their catalytic performance was systematically investigated. The results showed that Mn3O4 has greater catalytic properties than that of MnO2, its conversion rate was kept above 90% for 100 h at 230℃. In situ infrared and other series of characterization results show that compared with MnO2, Mn3O4 has appropriate redox ability, higher lattice oxygen activity, more surface adsorbed oxygen and stronger toluene adsorption ability, which promotes the benzoic acid species on the surface of the catalyst and rapid conversion, thereby improving its toluene catalytic performance. This work can serve as a guide for the development of manganese-based catalysts and their mechanism for toluene catalytic oxidation performance enhancement.

Key words: Mn3O4 catalyst, catalytic oxidation, toluene, in situ infrared

摘要:

在氧化还原法制备α-MnO2的基础上,通过控制焙烧温度和气氛制备了Mn3O4催化剂,系统考察了其甲苯催化性能。结果显示,Mn3O4催化性能优于MnO2,并且在230℃下保持转化率90%以上稳定运行100 h。原位红外等表征结果表明,与MnO2相比,Mn3O4具有适当的氧化还原能力、更高的晶格氧活性、更多的表面吸附氧和更强的甲苯吸附能力,促使催化剂表面苯甲酸物种的快速转化,进而提高其甲苯催化性能。本研究可为锰基催化剂的制备及其甲苯催化氧化性能提升机理研究提供参考。

关键词: Mn3O4催化剂, 催化氧化, 甲苯, 原位红外

CLC Number: