Abstract
Influences of the addition of alkanolamines and alkylammonium hydroxide into the starting suspensions on the shape and the size of zeolite-A (NaAlSiO4·xH2O) particles were investigated by optical microscopy and liquid-state NMR measurements. Zeolite-A was prepared from a mixture of NaAlO2, Na2SiO3·9H2O, alkanolamine or alkylammonium hydroxide, and H2O by hydrothermal treatment. The addition of triethanolamine (TEA) into the starting suspension led to the enlargement of the particle size of the prepared zeolite-A, whereas the addition of tetramethylammonium hydroxide (TMAOH) decreased it. TEA was confirmed to coordinate to Al to form [N(C2H4O)3Al(OH)]− complex, decreasing the degree of supersaturation of free [Al(OH)4]− and inhibiting the excess nucleation of zeolite. On the other hand, the addition of TMAOH facilitated the dissolution of silica gel in the starting suspension, very probably due to its higher basic property, and increased the degree of supersaturation of Si species, which resulted in the decreases in the particle size.
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