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Large Crystals Synthesis of Siliceous Layered Zeolitic PLS‐1 and CDS‐1 Zeolite by Dry Gel Conversion Method
Author(s) -
Banno Shohei,
Komura Kenichi
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800036
Subject(s) - zeolite , tetramethylammonium hydroxide , calcination , materials science , chemical engineering , crystal (programming language) , particle (ecology) , adsorption , hydroxide , mineralogy , inorganic chemistry , chemistry , catalysis , organic chemistry , nanotechnology , oceanography , geology , computer science , engineering , programming language
The 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.