Citation: Zhen Cheng, Jingrong Li, Peng Yang, Shufeng Zuo. Preparation of MnCo/MCM-41 catalysts with high performance for chlorobenzene combustion[J]. Chinese Journal of Catalysis, ;2018, 39(4): 849-856. doi: 10.1016/S1872-2067(17)62950-4 shu

Preparation of MnCo/MCM-41 catalysts with high performance for chlorobenzene combustion

Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, Zhejiang, China

Received Date: 18 November 2017
Revised Date: 25 December 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21577094).

MCM-41 was synthesized by a soft template technique. The specific surface area and pore volume of the MCM-41 were 805.9 m²/g and 0.795 cm³/g, respectively. MCM-41-supported manganese and cobalt oxide catalysts were prepared by an impregnation method. The energy dispersive X-ray spectroscopy clearly confirmed the existence of Mn, Co, and O, which indicated the successful loading of the active components on the surface of MCM-41. The structure and function of the catalysts were changed by modulating the molar ratio of manganese to cobalt. The 10%MnCo(6:1)/MCM-41 (Mn/Co molar ratio is 6:1) catalyst displayed the best catalytic activity according to the activity evaluation experiments, and chlorobenzene (1000 ppm) was totally decomposed at 270℃. The high activity correlated with a high dispersion of the oxides and was attributed to the exposure of more active sites, which was demonstrated by X-ray diffraction and high-resolution transmission electron microscopy. The strong interactions between MnO₂, Co₃O₄, MnCoO_x, and MCM-41 indicated that cobalt promoted the redox cycles of the manganese system. The bimetal-oxide-based catalyst showed better catalytic activity than that of the single metal oxide catalysts, which was further confirmed by H₂ temperature-programmed reduction. Chlorobenzene temperature-programmed desorption results showed that 10%MnCo(6:1)/MCM-41 had higher adsorption strength for chlorobenzene than that of single metal catalysts. And stronger adsorption was beneficial for combustion of chlorobenzene. Furthermore, 10%MnCo(6:1)/MCM-41 was not deactivated during a continuous reaction for 1000 h at 260℃ and displayed good resistance to water and benzene, which indicated that the catalyst could be used in a wide range of applications.
- MCM-41,
- Mn/Co,
- Catalytic combustion,
- Chlorobenzene,
- Characterization
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