Journal
MATERIALS
Volume 13, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/ma13081829
Keywords
SSZ-13; hydrothermal synthesis; different grain sizes; seeding method
Categories
Funding
- Science Fund of the State Key Laboratory of Engine Reliability [skler-201714]
- National Key Research and Development program [2017YFC0211302]
- National Natural Science Foundation of China [21676195]
- National Natural Science Foundation of China for Youths [21908207]
- Shanxi Province Science Foundation for Youths [201901D211224]
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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 mu m 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.
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