Influence of anions on the kinetics of zeolite A crystallization:

Colloid-Facilitated Transport of Radionuclides through the Vadose Zone

“…Similar template roles of anions in the formation of cancrinite and sodalite have been reported by and Bosnar et al (2004) …”

Mechanism of crystallization of zeolite A microcrystals from initially clear aluminosilicate solution: A population balance analysis

“…As expected, the growth profile of zeolite A crystals is similar to the growth profiles during the crystallization of zeolites from both hydrogels [45,47,[50][51][52][53][54][55] and clear aluminosilicate solutions [7,8,11,13,43,50,[56][57][58], i.e., L m increases linearly during the main part of the crystallization process and attains the constant value, L m ¼ L m (end), at the end of the crystallization process (see Fig. 3B).…”

“…Here it must be noticed that amorphous aluminosilicate was transformed into crystalline phase (zeolite A) at early stage of crystallization (see Figs. 1 and 2), so that the increase of m s is caused by the deposition of silicate and aluminate species from the liquid phase on the surfaces of the zeolite A crystals (crystal growth [17,46,[50][51][52][53][54][55]) formed during the ''induction period''; m s is equal to the mass, m z , of crystallized zeolite A after the entire amount of amorphous aluminosilicate has been transformed into zeolite A. The rate of crystallization considerably increases with the increase of the crystallization temperature (see Fig.…”

“…Hence, assuming that the nuclei formed in the gel phase can grow only in the full contact with the liquid phase, i.e., after their releasing from the dissolved part of gel [45][46][47]50,51,53,62,63,65], it is realistic to assume that the ''delaying'' of the growth process in our experiments is probably connected with the time needed for the formation of gel particles and the formation of nuclei in the gel particles as well as with the kinetics of release of the nuclei from the gel particles during their dissolution (autocatalytic nucleation) [53,62,63,65]. To check this assumption, the processes of crystallization at 40 and 60 1C are simulated/analyzed by population balance methodology.…”

Prediction of degree of crystallinity for the LTA zeolite using artificial neural networks

“…Chemically controlled particulate properties of zeolites [13], kinetics of zeolite crystallization [14], effect of thermal and hydrothermal treatment [15], influence of anions on the kinetics of zeolite crystallization [16], growth mechanism [17], and heating methods [18,19] are the most popular aspects of zeolites which have extensively been investigated by different researchers. In spite of a large amount of experimental studies on zeolites, they have not been effectively investigated from * E-mail: behzad.vaferi@gmail.com the theoretical point of view, and mathematical simulations of their behavior have not been fully developed.…”