Citation: YIN Xi-Jun, LONG Neng-Bing, ZHANG Xiang-Zhou, HOU Lin-Xi. Preparation and Catalytic Property of Macroporous MgO/ZrO2 Composite Catalyst[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(4): 739-746. doi: 10.3969/j.issn.1001-4861.2013.00.098
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A macroporous ZrO2 support was prepared by using a three-dimensional (3D) skeletal polymer through an in situ hydrolysis of Zirconium butoxide and a subsequent calcination at high temperature. Macroprocous MgO/ZrO2 composites were prepared by impregnation, calcination of magnesium nitrate solution. The composite materials were characterized by SEM, FTIR, XRD, TG-DSC. The results show that the macroporous zirconia supports have 3D ultrathin layer and the MgO nanoparticles cover on the 3D zirconia layer. The CO2-TPD curves indicate that the surface of zirconia supports has some weak alkaline sites and the sedimentation of MgO on the composite increases its alkalinity. The effect of preparation conditions on the catalytic activity was studied by using the transesterification of di-2-ethyl-hexyl carbonate from dimethyl carbonate and 2-ethyl-hexanol as the probe reaction. The results show that the macroporous MgO/ZrO2 solid base catalyst exhibits a better activity of transesterification. A better yield of the target product (65%) is obtained when the content of MgO is 50% and the calcination temperature is 600℃.
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