Citation:
LI Zhe-Qi, WANG Te-Hua, LI Xiu-Yuan, ZHANG Ya-Qin, JI Min. Preparation and Catalytic Performances of a Three-Dimensionally Ordered Macroporous MgFe0.1Al1.9O4 Catalyst for Ethylbenzene Oxydehydrogenation with CO2[J]. Acta Physico-Chimica Sinica,
;2015, 31(4): 743-749.
doi:
10.3866/PKU.WHXB201503025
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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 hexa nal 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.
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