Downsizing zeolites to obtain nanosized crystals for circumventing problems regarding molecular diffusion is a critical method for enhancing their functionalities, and therefore, such an approach has been the focus of significant attention. Here, we applied the postmilling recrystallization method for reducing the AFX aluminosilicate zeolite crystal sizes to the nanoscale. Highly crystalline AFX zeolite particles with crystal sizes smaller than 100 nm were obtained by the postmilling recrystallization method using the supernatant solution acquired during the preparation of the ingredient raw crystals used for the milling. The prepared AFX zeolite nanocrystals were found to possess better ion-exchange performance than micrometer-sized counterparts, highlighting the improved accessibility of the cations inside the micropores.
Interzeolite conversion, which refers to the synthesis of zeolites using a pre-made zeolite as the starting material, has enabled promising outcomes that could not be easily achieved by the conventional...
The STW-type zeolitei sa ttractive for developing novel enantioselective syntheses/separation of chiral compounds because it is the only chiral zeolitic microporous material whose enantioenriched synthesis has been achieved. In addition to the conventional industries in whichzeolites are used, STW should have diverse industrial applications in the pharmaceutical and food industries.H owever,t he toxic and caustic fluoride required for synthesizing STW severely hinders its commercialization by mass production. Herein, we report the first example of fluoride-free STW synthesis,i n which the two roles of fluoride-formation of az eolitic framework rich in tetravalent T-atoms and promotion of double 4-membered ring unit formation-were substituted by dry gel conversion and Ge addition, respectively.T he STW obtained was highly crystalline,w ith as imilar micropore volume and thermal stability as those of original fluoride-based STW.Our approach is promising not only for the fluoride-free synthesis of enantiomeric STW but also for general fluoridefree syntheses.
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