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Investigations on the crystallization of larger NaA and NaX zeolite crystals in the presence of triethanolamine (I). The influence of Na 2 O and SiO 2 content
Author(s) -
Neels H.,
Schmitz W.,
Berger E.M.,
Lutz D.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780131112
Subject(s) - triethanolamine , zeolite , crystallization , supersaturation , nucleation , sodium aluminate , silicate , crystal (programming language) , crystal growth , aluminosilicate , precipitation , inorganic chemistry , materials science , sodalite , chemistry , mineralogy , crystallography , analytical chemistry (journal) , chromatography , catalysis , metallurgy , organic chemistry , aluminium , computer science , programming language , physics , meteorology
Sodium silicate‐aluminate aqueous systems with various contents of Na 2 O and SiO 2 containing triethanolamine were crystallized. Optimum Na 2 O and SiO 2 contents have been observed to give NaA and NaX zeolite crystals with dimensions up to 80 μm. For NaA crystals the values are: ∼ 3.5 mass% Na 2 O, ∼ 1.65 mass% SiO 2 ; for NaX crystals ∼ 2.5 mass% Na 2 O, ∼ 1.5 mass% SiO 2 . – The effect of other additives on crystal size is proved. – The results are discussed in terms of nucleation and growth, reaction rate, and supersaturation. Supposition are made to gain larger crystals by maintaining the excess of solute over a longer period of time.