Enhanced catalytic activity of toluene oxidation over in-situ prepared Mn3O4-Fe2O3 with acid-etching treatment

• DOI: 10.1016/j.catcom.2022.106581
• Publication Date: 2022-12-09T05:58:09Z
• Authors: Juexiu Li; Ruiqin Zhang; Yue Liu; Tonghua Sun; Jinping Jia; Mingming Guo
• Keywords: Chemistry; Manganese oxide; 02 engineering and technology; Catalytic oxidation; 0210 nano-technology; QD1-999; Acid etching; Toluene; In-situ synthesis

Mn3O4-Fe2O3 composite catalysts are in-situ synthesized via advanced oxidation followed by modifying with hydrochloric acid to improve the catalytic toluene oxidation performance. Mn3O4-Fe2O3 modified with 1.0 M HCl (A-1.0) exhibited best activity of toluene oxidation. The temperature of 50% toluene conversion is 245 °C and the temperature of 90% conversion is 279 °C. There are much more abundant surface lattice oxygen species and higher amount of high valence manganese and iron ions on A-1.0 catalyst, which are beneficial for improving catalytic activity. In-situ DRIFTs indicated that benzaldehyde and benzoic acid are main intermediate products on A-1.0 catalyst during toluene oxidation.