The pore size distribution and crystallinity of KL zeolite treated with ammonium hexafluorosilicate (AFS) are dependent on the preparation conditions. It is shown that with increasing amount of AFS added, the volume of micropores decreases, the volume of mesopores increases, the average pore size decreases slightly and the crystallinity of samples becomes poor. Both good crystallinity and larger mesoporous volume are achieved by lowering the speed of adding AFS solution into reaction slurry. The presence of...
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