3 years ago

Synthesis of faulted CHA-type zeolites with controllable faulting probability

Synthesis of faulted CHA-type zeolites with controllable faulting probability
The faulted CHA-type zeolites with controllable faulting probability were prepared by interzeolite transformation of zeolite Y in the presence of various alkali metal cations. It was found that the Na+ ion played major role in synthesizing faulted CHA, and the degree of stacking fault in the zeolite was greatly affected by alkalinity and additional alkali metal ions (Li+, K+, Rb+ and Cs+). Depending on the synthesis condition, the faulted CHA with Si/Al2 ratio of 5.1–7.3 and the faulting probability of c.a. 2–80% was obtained. The crystallization process of faulted CHA was revealed by analyzing both liquid and solid phase during the synthesis. The FE-SEM analysis of the intermediate products clearly showed that the dissolved zeolite Y were assembled to form a secondary amorphous phase, on which the aggregated particles of faulted CHA were crystallized.

Publisher URL: www.sciencedirect.com/science

DOI: S1387181117305991

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