Abstract
［Objective］ To develop a magnetic solid superacid catalyst for the synthesis of ascorbyl palmitate via an SO42-/Fe3O4@Al2O3-TiO2 system,addressing the separation difficulties,substrate oxidation,and pollution issues associated with the traditional concentrated sulfuric acid method.［Methods］ SO42-/Fe3O4@Al2O3-TiO2 is prepared by a co -precipitation -sol-gel method.The catalyst is characterized by the Hammett indicator method,NH3-TPD,and VSM.Single -factor experiments are used to verify the catalytic activity of the catalyst for ascorbyl palmitate synthesis and optimize reaction parameters.The stability of the catalyst is further evaluated by recycling tests.［Results］ The results show that SO42-/Fe3O4@Al2O3-TiO2 exhibits superacidic properties (Hammett acidity function H0<−13.75) and high magnetic responsiveness (47.08 emu/g ).Under the optimized conditions (molar ratio of palmitic acid to ascorbic acid of 6:5,reaction temperature of 70 ℃,catalyst mass fraction of 7%,reaction time of 11 h),the yield of ascorbyl palmitate reaches 61.45% (purity 98.58%).After five cycles,the yield of ascorbyl palmitate remains above 50%,with high magnetic separation performance >20 emu/g ).［Conclusion］ The prepared solid superacid catalyst SO42-/Fe3O4@Al2O3-TiO2 demonstrates good stability,recyclability,and catalytic activity in esterification.
Publication Date
6-13-2025
First Page
19
Last Page
26
DOI
10.13652/j.spjx.1003.5788.2025.80275
Recommended Citation
Yufei, HUANG and Jianxian, ZHENG
(2025)
"Construction and application of magnetic core-shell structure SO42-/Fe3O4@Al2O3-TiO2 catalyst,"
Food and Machinery: Vol. 41:
Iss.
5, Article 3.
DOI: 10.13652/j.spjx.1003.5788.2025.80275
Available at:
https://www.ifoodmm.cn/journal/vol41/iss5/3
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