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Synthesis and characterization of ZSM‐8‐type zeolite crystals
Author(s) -
Joshi M. S.,
Mohan Prabhu K.
Publication year - 1988
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.2170230420
Subject(s) - zeolite , adsorption , calcination , materials science , hydrothermal synthesis , hydrothermal circulation , crystallography , zsm 5 , x ray crystallography , hexane , chemistry , mineralogy , diffraction , molecular sieve , chemical engineering , organic chemistry , catalysis , optics , physics , engineering
Procedure for hydrothermal synthesis of ZSM‐8‐type zeolite crystals, using TEA—OH as a template, in the system having molar composition 16.2 (Na 2 O) — Al 2 O 3 — 117 (SiO 2 ) — 4.8 (TEA) 2 O — 3887 H 2 O at 170 °C is described. Results of characterization of these crystals by XRD, IR, EDAX, SEM, TGA, and adsorption studies are described and discussed. X‐ray diffraction studies establish that the crystals are ZSM‐8‐type with structure similar to that of ZSM‐5‐type crystals. Crystals have prismatic bipyramidal morphology with average size 18–25 microns. Degased calcined samples adsorb xylenes in the order p > m > 0. Pore length per unit cell, estimated from n‐hexane adsorption studies, is 46 Å.