The role of triethanolamine (TEA) in zeolite NaA synthesis systems was investigated. Particle-size analyses on products formed in the presence of the amine revealed that TEA affected the nucleation and crystallization rates to some extent. Crystallization studies carried out in reduced aluminum and aluminum-free systems suggested an aluminum complexing role for TEA. The existence of a complex was confirmed by solution-phase 13C n.m.r. spectroscopy. Synthesis studies using close analogs of TEA revealed that all three hydroxyl groups as well as the amine group in TEA were necessary for successful complexation and nucleation suppression. Differential scanning calorimetry carried out on products crystallized in the presence of the amine showed that TEA did not act as a void filler during zeolite NaA crystallization.
- zeolite NaA
- zeolite crystallization