Mg/Al complex oxides-A new type of solid basic catalyst for epoxidation


Hydrotalcites known as anionic clays are found in nature. Hydrotalcites, hydrotalcite-like compounds, and calcined hydrotalcites (as mixed or complex oxides) as highly active, selective catalysts play an important role in many base/catalyzed reactions. Mg/Al hydrotalcite (MAH) as precursor was used to prepare Mg/Al metal complex oxides (MAO), used as epoxidation catalysts in the current research. In this paper, some primary physical and catalytic properties of MAH and MAO were investigated. The results indicated that the qualified MAH (Mg/Al mol ratio of 3) can be achieved when the suspension was crystallized under 80°C for 16h, and after being filtered, dried at 100 °C for 5h in a oven. MAO was prepared by calcining MAH for 4h in a muffle furnace, and calcination temperature was determined to be 500 °C by a differential scanning calorimeter (DSC). Crystal structure and parameters of MAH and MAO were characterized by X/ray diffraction (XRD), good crystal structure was observed and typical peaks of MAH were detected when 2θ was at 11.5 (003), 23.0 (006), 35.0 (009), and 61.0 (110), respectively. The morphology of calcined precursor, i.e. MAO, was investigated with scanning electron microscopy (SEM); the finer lamellar structure and smaller average size of 3μm was observed. Molding research was performed and confirmed by SEM, the results indicated that the surface bulge and cavity with size of several micrometers were increased, which simultaneously suggested the increasing of specific surface area. The catalytic activity of molding MAO was finally examined by using octanol as starting reagent and ethylene oxide as reactant, and narrower molecular distribution was observed comparing with the traditional catalyst-KOH.

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Miao, H. , Xu, S. , Wang, H. , Qin, W. , Zhang, L. , Zhang, J. , Yang, J. , Dai, Z. , Zheng, G. and Tang, E. (2010) Mg/Al complex oxides-A new type of solid basic catalyst for epoxidation. Journal of Biomedical Science and Engineering, 3, 213-216. doi: 10.4236/jbise.2010.32028.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Jana, S.K., Kubota, Y., and Tatsumi, T., Catal, J. (2008) 255, 40-47.
[2] Wang, H., Chen, J., Cai, Y., Jia, J., Liua, L., and Tengb, H.H. (2007) Applied clay science, 35, pp. 59-66.
[3] Liu, Y., Lotero, E., Goodwin, Jr.J.G., and Mo, X. (2007) Applied catalysis A. 331, 138-148.
[4] Lenard, M., Storaro, L., Frattinic, R., Casagrande, M., Marchiori, M., Capannelli, G., Uliana, C., Ferrarib, F. and Ganzerl, R. (2007) Catalysis communications, 8, 467- 470.
[5] Maggi, R., Malmassari, C., Oro, C., Pela, R., Sartori, G., and Soldi, L. (2008) Synthesis, 53-56.
[6] Huang, J.W. (2002) Study on synthesis of fatty alcohol polyether with narrow range distribution rroperties and application after its phosphate esterification [D]. Tianjin Polytechnic University.
[7] Jia, L.W. (2003) The study of ethoxylation catalyzed by Mg-Al complex mental oxides and enzymes [D]. Tianjin Polytechnic University.
[8] He, H.M., Sun, T., Jiang, D.P. etc. (1994) Study on preparation and characterization of hydrotalcites pillared with tri-atomic heteropoly anions of P-W system [J]. Chinese J Inorg Chem., 10(3), 272-277.
[9] Huang, Z.T., Zeng, Z.H., Zhong, B.K. etc. (1999) The technique and application of inorganic membrane [M]. China Petrochemical Press, 16-150, 151-158.
[10] Natta, G. (1954) Rend. Ist. Lombardo. Sci. letter [M]. 78 (1), 3071, 336.
[11] Zhou, G.D., Guo, K.X. (1999) The diffraction of crystal and quasicrystal [M]. Perking University Press. Liang, D.C. (1990) X-ray crystallographic basis [M].

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