Journal of Metals, Materials and Minerals


W. Trakarnpruk

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In this research work layered double hydroxides (LDHs) containing Mg, Cu and Cr(or Al) were prepared with starting Mg:Cu:Cr (or Al) molar ratio of 2:1:1. They were calcined at 500 ºC for 5 h to convert into corresponding mixed oxides possessing high surface area. The catalysts were characterized by chemical analysis (ICP), infrared spectroscopy (FTIR), thermal analysis (TGA/DTA), powder X-ray diffraction (XRD), surface area measurements and H2 temperature programmed reduction (TPR). Catalytic property of these mixed oxides catalysts were tested in the oxidation of ethylbenzene using tertbutylhydroperoxide as an oxidant without added solvent. The experimental results show that high conversion of ethylbenzene and selectivity to acetophenone can be obtained. The MgCuAl oxide shows higher selectivity to acetophenone (95%) whereas the MgCuCr oxide displays higher activity (88% conversion). The difference in catalytic performance is due to type of metal in the material. The catalysts could be reused at least 3 times without significant loss in activity.

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