【摘要】 采用直接和间接合成法,将硼原子嵌入介孔分子筛SBA 15骨架中,用柠檬酸与正丁醇的酯化反应评价催化剂的催化性能。间接和直接合成法合成的催化剂活性对比结果表明,间接合成法制备催化剂的活性高于直接合成催化剂。重点考察了催化剂中硅硼比、催化剂用量、反应温度和酸醇比等因素对间接合成催化剂酯化反应性能的影响。筛选出B SBA 15催化剂最佳硅硼摩尔比为30∶1,最佳反应条件:催化剂用量为原料质量的1 5%,反应温度为130℃,酸醇摩尔比1∶6。试验结果表明,介孔分子筛催化剂B SBA 15具有较高的稳定性,是合成柠檬酸三丁酯较为理想的分子筛催化剂。更多还原

【Abstract】 Mesoporous B-SBA-15 molecular sieves were synthesized by direct and indirect method, respectively. Tributyl citrate was synthesized from citric acid and butanol over B-SBA-15 catalysts. The results showed that the catalyst obtained by indirect method exhibited higher activity than that by direct method. The influences of citric-acid-to-butanol molar ratio, reaction temperature, and quantity of the catalyst on esterification were investigated. Optimum silica-to-boric mass ratio for synthesis of the catalyst was 30∶1.Optimum reaction condition for synthesis of tributyl citrate was as follows: 130 ℃; citric-acid-to-butanol molar ratio = 1∶1;catalyst-to-reactant mass ratio = 1.5%; reaction time = 5 h.Repeated use of B-SBA-15 indicated that the catalyst has high stability under esterification condition.更多还原