食品与机械2025，Vol.41Issue(5)：19-26,8.DOI:10.13652/j.spjx.1003.5788.2025.80275
磁性核壳结构SO42-/Fe3O4@Al2O3-TiO2催化剂的构建及应用
Construction and application of magnetic core-shell structure SO42-/Fe3O4@Al2O3-TiO2 catalyst
摘要
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.关键词
抗坏血酸棕榈酸酯/SO42-/Fe3O4@Al2O3-TiO2/固体超强酸/酯化合成/非均相催化剂Key words
ascorbyl palmitate/SO42-/Fe3O4@Al2O3-TiO2/solid superacid/esterification synthesis/heterogeneous catalyst引用本文复制引用
黄雨菲,郑建仙..磁性核壳结构SO42-/Fe3O4@Al2O3-TiO2催化剂的构建及应用[J].食品与机械,2025,41(5):19-26,8.基金项目
广东省自然科学基金资助项目(编号:2024A1515013267) （编号:2024A1515013267）
