论文部分内容阅读
运用度角旋转（MAS）和交叉极化（CP）等核磁共振波谱和红外光谱技术，分别对采用不同模板剂制备的高硅ZSM－5分子筛和以此为母体，经气固同晶取代法得到Ti－ZSM－5分子筛的结构特性进行了研究．结果表明：在水热法合成高硅ZSM-5分子筛过程中，模板剂明显制约着所制得的分子筛的结构特性．通过选用合适的模板剂，可直接获得具有正交晶系结构的高硅ZSM－5分子筛．在随后的气固相同晶取代过程中，钛原子通过占据分子筛骨架中的缺陷位进入骨架，形成具有一定Ti／Si比例的钛硅分子筛（Ti－ZSM－5）。骨架结构中缺陷位的含量直接影响分子筛的载钛量。
By using nuclear magnetic resonance spectroscopy (MAS) and cross-polarization (CP) and infrared spectroscopy, the high-molecular-weight ZSM-5 zeolite prepared by using different template agents was synthesized and substituted by gas- The structural characteristics of Ti-ZSM-5 zeolite were studied. The results show that the templating agent obviously restricts the structural properties of the zeolites synthesized by hydrothermal synthesis of high-molecular-weight ZSM-5 zeolites. By selecting a suitable template, the high-silicon ZSM-5 molecular sieve with orthorhombic structure can be directly obtained. During subsequent gas-solid isomorphous substitution, titanium atoms enter the framework by occupying the defect sites in the molecular sieve framework, forming a titanium-silicon molecular sieve (Ti-ZSM-5) with a certain Ti / Si ratio. The content of defect sites in the framework structure directly affects the amount of titanium supported on the molecular sieve.