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| Synthesis and Characterization of Solid Base Catalyst Na2O/Al2O3-MgO with High Activity |
| Author Name | Affiliation | E-mail | | LIU Shou-Qing | Faculty of Science, Southwest Forestry University, Kunming 650224, China | | | LI Xue-Mei | Faculty of Science, Southwest Forestry University, Kunming 650224, China | | | HE Xian-Wu | Faculty of Science, Southwest Forestry University, Kunming 650224, China | | | LIU Xiang-Yi | Faculty of Science, Southwest Forestry University, Kunming 650224, China | 13577068220@126.com | | ZHENG Zhi-Feng | College of Materials Engineering, Southwest Forestry University, Kunming 650224, China | zhengzhifeng666@163.com |
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| Abstract: The catalytic performance of catalyst supported on the Al2O3-MgO was unstable due to the loss of aluminum ions caused by the excessive NaOH.In this study,a stable catalyst Na2O/Al2O3-MgO was synthesized using the ammonia as precipitator to generate co-precipitate of Mg-Al which it subsequently underwent impregnation with Na2CO3,aging process and calcination.In addition,the structure and morphology of the catalyst were characterized through XRD,SEM,SEM-EDS,TG-DSC,and N2 adsorption-desorption,and the catalytic activity was evaluated by the methyl esterification rate of malania oleifera oil.The results showed that catalyst precursors with the hydrotalcite-like structure could be obtained by co-precipitation and impregnation method,which the decomposition temperature of it was in the range of 200~500℃ and there were Na-Al as well as Na-Mg-Al oxides in the catalyst after high temperature calcination.The preparation condition of Na2O/Al2O3-MgO catalyst with high activity covered nMg/nAl as 3:1~1:3,the aging time as 12 hours,calcination temperature as 550℃ and calcination time as 5 hours.The verification experiment of catalyst prepared with nMg/nAl as 1:1 was conducted and the result revealed that the catalyst was a mesoporous catalyst with specific surface area of 30 m2·g-1 and the average pore size of 8.8 nm.Moreover,the catalyst processed high activity in the methyl esterification rate of malania oleifera oil and the conversion rate was up to 96.4%. |
| Keywords: magnesium-aluminum composite oxides hydrotalcite-like compound preparation malania oleifera oil methyl esterification |
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| LIU Shou-Qing,LI Xue-Mei,HE Xian-Wu,LIU Xiang-Yi,ZHENG Zhi-Feng.Synthesis and Characterization of Solid Base Catalyst Na2O/Al2O3-MgO with High Activity[J].Chinese Journal of Inorganic Chemistry,2017,33(7):1153-1160. |
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