ITQ-24分子筛的合成及催化性能研究

以1,1’-1,4-苯双亚甲基]双1-甲基吡咯烷]氢氧化物为有机结构导向剂（OSDA）制备了ITQ-24分子筛，系统考察了GeO₂含量、OSDA用量、HF含量、晶化温度、搅拌速率对ITQ-24分子筛晶化的影响。并采用X-射线衍射（XRD）、扫描电子显微镜（SEM）、氨程序升温脱附（NH₃-TPD）和吡啶吸附红外光谱（Py-IR）等方法对晶化产物进行了表征。结果表明：适合ITQ-24分子筛晶化的初始凝胶组成为n（SiO₂）∶n（GeO₂）∶n（OSDA）∶n（H₂O）＝1∶（0.2～0.5）∶0.3∶（5～20），晶化条件为动态、170 ℃；所制得的ITQ-24分子筛具有较高的水热稳定性，含有较多的弱酸和Lewis酸位。将该分子筛应用于环己酮氧化制备ε-己内酯反应中，在80 ℃最佳反应温度下，环己酮的转化率为22.5%，ε-己内酯的选择性可达到54.5%。

TECHNICAL AND ECONOMIC ANALYSIS OF S Zorb UNIT

ITQ-24 zeolite was synthesized using 1,1’-1,4-phenylenebis（methylene）] bis 1-methyl pyrrolidinium] hydroxide as organic structure-directing agent（OSDA）. The effects of Ge content，OSDA amount，HF content，crystallization temperature，and stirring speed on the crystallization of ITQ-24 zeolite were investigated,respectively. X-ray diffraction（XRD），scanning electron microscope（SEM），temperature-programmed desorption of NH₃（NH₃-TPD）and Fourier transform infrared spectroscopy of pyridine adsorption（Py-IR）methods were carried out to characterize the obtained zeolites. The suitable molar compositionn（SiO₂）∶n（GeO₂）∶n（OSDA）∶n（H₂O）for the crystallization of ITQ-24 zeolite is 1∶（0.2-0.5）∶0.3∶（5-20），and the optimum temperature is 170 ℃ under dynamic condition. The ITQ-24 zeolite has high hydrothermal stability and contains lots of weak and Lewis acid sites. In the oxidation reaction of cyclohexanone to ε-caprolactone，using ITQ-24 as catalyst,the ε-caprolactone selectivity reached 54.5% with 22.5% cyclohexanone conversion under the optimum temperature of 80 ℃.