Solubility of Zeolite A and Its Amorphous Precursor under Synthesis Conditions

Abstract

Solubility measurements are reported for zeolite A crystals and amorphous zeolite precursor in aqueous sodium hydroxide solutions at conditions pertinent to industrial synthesis (3.02−4.39 M NaOH, 303−353 K). Zeolite crystal solubility is generally, but not always, found to increase with temperature and alkali concentration. Zeolite precursor has much higher solubility than the zeolite A crystals at similar conditions.