A new environmental friendly catalyst, H_4SiW_(12)O_(40)/PAn was prepared andidentified by means of FT-IR, XRD and TG/DTA. Cyclohexanone 1,2-propanediol ketal was synthesizedfrom cyclohexanone and 1,2-propanediol in t...A new environmental friendly catalyst, H_4SiW_(12)O_(40)/PAn was prepared andidentified by means of FT-IR, XRD and TG/DTA. Cyclohexanone 1,2-propanediol ketal was synthesizedfrom cyclohexanone and 1,2-propanediol in the presence of H_4SiW_(12)O_(40)/PAn The factorsinfluencing tlie synthesis were discussed and the best conditions were found out. The optimumconditions are: molar ratio of cyclohexanone to 1,2-propanediol is 1:1.4, the quantity of catalystis equal to 1.0 percent of feed stocks, and the reaction time is 40 min. H_4SiW_(12)O_(40)/PAn is anexcellent catalyst for synthesizing cyclohexanone 1,2-propanediol ketal and its yield can reachover 96.5 percent.展开更多
以溶胶-凝胶法制备磷钨酸/硅胶催化剂,通过丁酮和1,2-丙二醇反应合成丁酮1,2-丙二醇缩酮,探讨了磷钨酸/硅胶对缩酮反应的催化活性,较系统地研究了酮醇摩尔比、催化剂用量、反应时间和带水剂用量诸因素对产品收率的影响。实验表明,磷钨酸...以溶胶-凝胶法制备磷钨酸/硅胶催化剂,通过丁酮和1,2-丙二醇反应合成丁酮1,2-丙二醇缩酮,探讨了磷钨酸/硅胶对缩酮反应的催化活性,较系统地研究了酮醇摩尔比、催化剂用量、反应时间和带水剂用量诸因素对产品收率的影响。实验表明,磷钨酸/硅胶是合成丁酮1,2-丙二醇缩酮的良好催化剂,在 n(酮):n(醇)=1:1.4,催化剂用量为反应物料总质量的0.75%,环己烷为带水剂,反应时间60 min 的优化条件下,丁酮1,2-丙二醇缩酮的收率可达80.0%。展开更多
文摘A new environmental friendly catalyst, H_4SiW_(12)O_(40)/PAn was prepared andidentified by means of FT-IR, XRD and TG/DTA. Cyclohexanone 1,2-propanediol ketal was synthesizedfrom cyclohexanone and 1,2-propanediol in the presence of H_4SiW_(12)O_(40)/PAn The factorsinfluencing tlie synthesis were discussed and the best conditions were found out. The optimumconditions are: molar ratio of cyclohexanone to 1,2-propanediol is 1:1.4, the quantity of catalystis equal to 1.0 percent of feed stocks, and the reaction time is 40 min. H_4SiW_(12)O_(40)/PAn is anexcellent catalyst for synthesizing cyclohexanone 1,2-propanediol ketal and its yield can reachover 96.5 percent.
文摘以溶胶-凝胶法制备磷钨酸/硅胶催化剂,通过丁酮和1,2-丙二醇反应合成丁酮1,2-丙二醇缩酮,探讨了磷钨酸/硅胶对缩酮反应的催化活性,较系统地研究了酮醇摩尔比、催化剂用量、反应时间和带水剂用量诸因素对产品收率的影响。实验表明,磷钨酸/硅胶是合成丁酮1,2-丙二醇缩酮的良好催化剂,在 n(酮):n(醇)=1:1.4,催化剂用量为反应物料总质量的0.75%,环己烷为带水剂,反应时间60 min 的优化条件下,丁酮1,2-丙二醇缩酮的收率可达80.0%。