Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (4): 849-856.DOI: 10.1016/S1872-2067(17)62950-4

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

Zhen Cheng, Jingrong Li, Peng Yang, Shufeng Zuo   

  1. Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, Zhejiang, China
  • Received:2017-11-18 Revised:2017-12-25 Online:2018-04-18 Published:2018-04-08
  • Contact: 10.1016/S1872-2067(17)62950-4
  • Supported by:

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

Abstract:

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, MnCoOx, 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.

Key words: MCM-41, Mn/Co, Catalytic combustion, Chlorobenzene, Characterization