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对KNO3/MCM-48用于丙醇和碳酸二甲酯进行酯交换合成碳酸二丙酯的催化性能进行了考察.用X射线衍射(XRD)、红外光谱(IR)和X射线荧光法研究了催化剂的结构特征和表面性质.XRD结果表明,随着K负载量的增加,载体特征峰强度逐渐减弱,但仍保留MCM-48的晶体结构.随着焙烧温度的升高,KNO3逐渐分解成K2O.分别考察了活性组分负载量、焙烧温度、焙烧时间和催化剂的用量以及反应时间对反应的影响.结果表明,KNO3/MCM-48催化剂对碳酸二丙酯的合成具有很高的催化活性.在反应温度363 K,反应时间6 h,催化剂用量5%,丙醇与碳酸二甲酯摩尔比为4的条件下,碳酸二甲酯的转化率可达99.9%,产物碳酸二丙酯选择性93.4%,产率93.3%.
The catalytic performance of KNO3 / MCM-48 for the transesterification of propanol with dimethyl carbonate was investigated.XRD, IR and X-ray fluorescence spectra of the catalyst XRD results show that the intensity of the characteristic peak of the carrier decreases gradually with the increase of the K loading, but the crystal structure of the MCM-48 remains. As the calcination temperature increases, KNO3 gradually decomposes into K2O. The effects of reaction temperature, calcination temperature, calcination time, amount of catalyst and reaction time on the reaction were investigated respectively. The results show that KNO3 / MCM-48 catalyst has high catalytic activity for the synthesis of dipropyl carbonate. The reaction temperature was 363 K, the reaction time was 6 h, the amount of catalyst was 5% and the molar ratio of propanol to dimethyl carbonate was 4. The conversion of dimethyl carbonate was up to 99.9% and the selectivity to dipropyl carbonate was 93.4 %, Yield 93.3%.