期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 338, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2022.111970
关键词
K+ molar ratio; Amorphous gel; Nucleation; SCR activity; Repolymerization period
类别
资金
- National Natural Science Foundation of China [U21B2099]
The presence of alkali metal cations has a significant impact in the hydrothermal synthesis of SSZ-13 zeolite, leading to faster synthesis and prevention of gel formation.
Hydrothermal synthesis of SSZ-13 zeolite from precursors comprises many unanswered fundamental questions, in which understanding the effects of alkali metal cations on the structural rearrangement during the crystallizing period is an active and expanding area of research. Experimental results showed that the continuous crystallization process of SSZ-13 crystals can be easily hindered by the amorphous gel during the synthesis process. Accordingly, we carefully explored and repeated the crystallization period of SSZ-13 zeolite with different K+ mole ratios, which demonstrated significant effects on their crystallization behaviors with the easy breaking of amorphous gel state. The crystallization time was obviously shortened to 18 h. Theoretical calculation results also demonstrated that K+ cation in the precursor solution is more inclined to control the successive deprotonation process due to the higher activation energies for Si-O-Al bonds formation. Accordingly, the SSZ-13 zeolite sample tend to realize fast synthesis and transform into scattered crystals without aggregation by addition of K+ cation.
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