环境友好催化剂TiSiW_(12)O_(40j)/TiO_2的制备及其催化性能研究 |
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引用本文: | 杨水金,梁永光,孙聚堂. 环境友好催化剂TiSiW_(12)O_(40j)/TiO_2的制备及其催化性能研究[J]. 有机化学, 2003, 23(11): 1294-1298 |
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作者姓名: | 杨水金 梁永光 孙聚堂 |
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作者单位: | 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 武汉430072,湖北师范学院化学与环境工程系黄石435002,湖北师范学院化学与环境工程系教授,现在武汉大学化学与分子科学学院攻读博士学位,武汉430072,武汉430072 |
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基金项目: | 国家自然科学基金 (No.2 9971 0 2 4 ),湖北省教育厅重点科研基金 (No.2 0 0 2A0 0 0 0 8)资助项目 |
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摘 要: | 制备了新型固载杂多酸盐TiSiW_(12)O_(40)/TiO_2环境友好催化剂,并以丁酸 丁酯的合成作为探针反应,系统考察了原料H_4SiW_(12)O_(40)·xH_2O与TiO_2摩 尔比、焙烧温度、焙烧时间等制备条件对TiSiW_(12)O_(40)/TiO_2催化活性的影响 。实验表明:制备催化剂的适宜条件为原料H_4SiW_(12)O_(40)·xH_2O与TiO_2摩 尔比为0.47,焙烧温度为350 ℃,焙烧时间为3.0 h。利用该条件下制备的催化剂 TiSiW_(12)O_(40)/TiO_2合成了丁酸丁酯正丁醇与正丁醇的投料摩尔比n(醇):n(酸 ) = 1.3:1,催化剂的用量占反应物总投料质量的1.3%,反应时间为1 h,丁酸丁酯 的产率为97.2%。该催化剂TiSiW_(12)O_(40)/TiO_2用于制备其它丁酸酯类(如乙 酯、丙酯、戊酯、异戊酯)时同样取得了好的结果。
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关 键 词: | 硅酸盐 钨酸盐 钛化合物 氧化钛 丁酸酯 酯化 催化活性 焙烧 丁醇 |
修稿时间: | 2002-10-15 |
Preparation and Catalytic Activity of TiSiW_(12)O_(40j)/TiO_2 in Synthesis of Butyric Esters |
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Affiliation: | College of Chemistry and Molecular Sciences, Wuhan University |
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Abstract: | A new environmentally friendly catalyst, TiSiW_(12)O_(40)/TiO_2 was prepared. Its catalytic activity in esterification of n-butanoic acid and re-butyl alcohol was measured and compared with that of H_3PW_(12) O_(40) or H_2SO_4. TiSiW_(12)O_(40)/TiO_2 showed better catalytic activity than H_3PW_(12)O_(40) or H_2SO_4. The optimum reaction condition was that the molar ratio of alcohol to acid was 1.3:1, the mass ratio of the catalyst used to the reactants was 1.3%, and the reaction time was 1 h. Under these conditions, the yield of ethyl ester is 87%, propyl ester 93% , rc.-butyl ester 97.2%, n-amyl ester 98% , and iso-amyl ester 95% , respectively. |
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Keywords: | TiSiW 12O 40/TiO 2 environmentally friendly catalyst butyric ester esterification |
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