Efficient Hydrothermal Synthesis of SSZ-13 with Variable Grain Size
Efficient Hydrothermal Synthesis of SSZ-13 with Variable Grain Size
复制标题
高效水热合成可变粒度SSZ-13
DOI：
10.3390/ma13081829
复制
发表时间：
2020-04-01
期刊：
影响因子：
3.4
通讯作者：
Shen, Meiqing
中科院分区：
文献类型：
--
作者：
Wang, Yibao;Wang, Chen;Shen, Meiqing
为了满足工业上对SSZ-13的需求，首次采用晶种法水热合成了不同硅铝比的SSZ-13。使用一组表征，如X射线荧光（XRF）、X射线衍射（XRD）和扫描电子显微镜（SEM），可以追踪物理化学结构和粒度分布。通过改变结构导向剂（SDA）和NaOH的用量，优化了SSZ-13分子筛的硅铝比，得到了结晶度较高的SSZ-13分子筛。由于pH值的限制，碱度和含水量的变化不利于SSZ-13材料的不同粒径的形成。在研磨晶种的帮助下，从0.4 μ m到4 μm的各种粒度的SSZ-13具有相似的结晶度和粒度分布。此外，由于NMR结果中Al峰的强度相同，因此不同粒度的SSZ-13 s具有相同的酸性。我们的研究表明，使用种子法是一种简单有效的方法来合成不同大小的SSZ-13。
To meet the industrial needs for SSZ-13, variable sizes of SSZ-13 with different Si/Al ratios were firstly obtained by conventional hydrothermal synthesis using the seed method. Using a set of characterizations, like X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM), the physicochemical structure and size distribution could be traced. After the specific Si/Al ratio of SSZ-13 zeolites was optimized, synthesized by changing the amounts of structure-directing agents (SDAs) and NaOH, the obtained SSZ-13 showed a high degree of crystallinity. With the limitation of the pH values, the variation of the alkalinity and water content was not helpful to generate different grain sizes of SSZ-13 materials. With the help of ground seed, the various grain sizes of SSZ-13s from 0.4 to 4 μm had a similar degree of crystallinity and size distribution. Moreover, due to the identical intensity of the Al peak in the NMR results, the different grain sizes of SSZ-13s had the same acidity. Our study revealed that using the seed method was an easy and efficient way to synthesize SSZ-13s with different sizes.