Abstract
AbstractThe large crystal of siliceous zeolitic layered PLS‐1, which is a precursor of CDS‐1 zeolite with CDO‐type topology, can be successfully prepared by dry‐gel conversion (DGC) method from a dry‐gel containing layered silicate H‐kanemite and tetramethylammonium hydroxide (TMAOH) as an organic structure‐directing agent (OSDA), and it allows transform to CDS‐1 zeolite by calcination with retaining its large crystal particle. Characterizations of the obtained CDS‐1 zeolite reveal the different morphology compared by conventional methods. Its particle is found to be aggregated by an enlarged thickness of layered crystals reflecting a zeolitic precursor of PLS‐1. Gradual increases of nitrogen adsorption at around middle pressure and FE‐SEM measurements strongly indicate that the obtained particles have many steps and aperture like card‐house assembly of layered PLS‐1 large crystals.
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