Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (4): 743-749.doi: 10.3866/PKU.WHXB201503025

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation and Catalytic Performances of a Three-Dimensionally Ordered Macroporous MgFe0.1Al1.9O4 Catalyst for Ethylbenzene Oxydehydrogenation with CO2

LI Zhe-Qi1, WANG Te-Hua2, LI Xiu-Yuan3, ZHANG Ya-Qin2, JI Min2   

  1. 1 College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning Province, P. R. China;
    2 College of Chemistry, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China;
    3 API Production Division, Northeast Pharmaceutical Group Co., LTD., Shenyang 110000, P. R. China
  • Received:2014-12-11 Revised:2015-02-11 Published:2015-04-03
  • Contact: JI Min E-mail:jimin@dlut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21356001) and Fundamental Research Funds for the Central Universities of Dalian University of Technology, China (DUT12ZD219).

Abstract:

Polymethyl methacrylate (PMMA) microspheres were synthesized using an emulsifier-free emulsion polymerization method. A three-dimensionally ordered macroporous (3DOM) MgFe0.1Al1.9O4 spinel-type oxide catalyst was prepared using the synthesized colloidal crystal templates and evaluated for oxidative dehydrogenation of ethylbenzene with CO2. Several techniques, such as powder X-ray diffraction, scanning electron microscopy, temperature-programed reduction, and 57Fe-Mössbauer spectra, were used to characterize the physicochemical properties of the catalyst. The results indicate that 3DOM MgFe0.1Al1.9O4 has a hexagonal ordered arrangement, with a pore diameter of 230 nm and a shell thickness of 60 nm, and that most of its Fe species are incorporated into the spinel lattice. Compared with a nano MgFe0.1Al1.9O4, the 3DOM MgFe0.1Al1.9O4 catalyst exhibited a much higher catalytic stability and less carbon deposition. A possible explanation for the enhanced catalytic stability of 3DOM MgFe0.1Al1.9O4 catalyst is discussed. The three-dimensionally ordered macroporous structure has a large effect on the diffusion of coke precursors and the stability of the catalyst.

Key words: Three-dimensionally ordered macroporous material, Mg-Fe-Al spinel, Carbon dioxide, Dehydrogenation of ethylbenzene, Stability

MSC2000: 

  • O643