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Synthesis and characterization of ferrierite
Author(s) -
Çulfaz Ali,
Yilmaz A. Kürşat
Publication year - 1985
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.2170200103
Subject(s) - ferrierite , chemistry , zeolite , molecular sieve , tridymite , orthoclase , crystallization , materials science , organic chemistry , quartz , adsorption , catalysis , cristobalite , feldspar , composite material
Ferrierite, a medium‐port molecular sieve zeolite, was synthesized as the only crystalline phase from an aqueous gel of composition 1.6 Na 2 O · 1.6 K 2 O · Al 2 O 3 · 13.5 SiO 2 · 130 H 2 O · 0.8 CO 2 · 2.4 (HCO 2 ) 2 at 250 °C in reaction periods ranging from 40 to 95 hours. The crystallization time was reduced with seeding. Ferrierite was a metastable phase in this system and it transformed into tridymite, high sanidine and orthoclase at longer reaction periods. At 200 °C, chabazite was crystallized from the same batch composition at a very slow rate. At temperatures higher than 250 °C and in the absence of carbonates and bicarbonates in the batch mixture, tridymite, high sanidine and orthoclase crystallized directly without the formation of ferrierite. The synthetic ferrierite sorbs benzene, toluene and cyclohexane and behaves as a medium port molecular sieve. The sorption capacity of ferrierite was improved by acid treatments with no deterioration of the crystal structure.