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以Fe_3O_4为磁性基质,采用液相共沉淀法制备磁性固体碱催化剂Fe_3O_4/Ni O,并用于聚对苯二甲酸乙二醇酯(PET)的醇解反应。以催化醇解反应得到的对苯二甲酸二乙二醇酯(BHET)回收率为指标,通过响应面法优化得到催化剂合成的最佳条件,即前驱体n(Fe_3O_4)∶n[Ni(AC)_2]=1∶3.94,反应时间1.67 h,催化剂煅烧时间2.01 h,煅烧温度600℃。以最优条件制备的催化剂在乙二醇介质,反应温度195℃,降解反应时间4 h,催化剂用量为PET质量的2.0%的条件下进行醇解反应,BHET回收率达到81.47%。采用XRD、BET和SEM对催化剂进行表征,结果表明:催化剂具有片状结构,比表面积较大,降解产物是BHET。
The magnetic solid base catalyst Fe_3O_4 / NiO was prepared by liquid coprecipitation method using Fe_3O_4 as the magnetic matrix and was used for the alcoholysis reaction of polyethylene terephthalate (PET). The optimum conditions of the catalyst synthesis were obtained by the response surface methodology, which was the reaction of n (Fe 3 O 4): n [AC (BH) ) _2] = 1: 3.94, reaction time 1.67 h, catalyst calcination time 2.01 h, calcination temperature 600 ℃. The optimal conditions for the preparation of the catalyst in the ethylene glycol medium, the reaction temperature of 195 ° C, the reaction time of 4 h, the catalyst amount of 2.0% PET quality under the conditions of alcoholysis, BHET recovery rate of 81.47%. The catalysts were characterized by XRD, BET and SEM. The results showed that the catalyst has a flaky structure, a large specific surface area and a BHET degradation product.