Citation: 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. doi: 10.11862/CJIC.2017.141 shu

Synthesis and Characterization of Solid Base Catalyst Na₂O/Al₂O₃-MgO with High Activity

1.
Faculty of Science, Southwest Forestry University, Kunming 650224, China
2.
College of Materials Engineering, Southwest Forestry University, Kunming 650224, China

Corresponding author: LIU Xiang-Yi, 13577068220@126.com ZHENG Zhi-Feng, zhengzhifeng666@163.com
Received Date: 7 October 2016
Revised Date: 12 May 2017

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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 n_Mg/n_Al 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 n_Mg/n_Al 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%.
- magnesium-aluminum composite oxides,
- hydrotalcite-like compound,
- preparation,
- malania oleifera oil,
- methyl esterification
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Characterization of Solid Base Catalyst Na2O/Al2O3-MgO with High Activity

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Synthesis and Characterization of Solid Base Catalyst Na₂O/Al₂O₃-MgO with High Activity