Preparation and catalytic property of high surface area mixed oxides from calcination of MgCuCr- and MgCuAl-layered double hydroxides
In this research work layered double hydroxides (LDHs) containing Mg, Cu and Cr(or Al) have been prepared with starting Mg:Cu:Cr (or Al) molar ratio of 2:1:1. They were calcined at 500 ?C 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 tert-butylhydroperoxide 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 shower higher selectivity to acetophenone (95%) whereas the MgCuCr oxide displayed 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 signi?cant loss in activity.
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