2015
DOI: 10.1002/chem.201501919
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3D Study of the Morphology and Dynamics of Zeolite Nucleation

Abstract: The principle aspects and constraints of the dynamics and kinetics of zeolite nucleation in hydrogel systems are analyzed on the basis of a model Na-rich aluminosilicate system. A detailed time-series EMT-type zeolite crystallization study in the model hydrogel system was performed to elucidate the topological and temporal aspects of zeolite nucleation. A comprehensive set of analytical tools and methods was employed to analyze the gel evolution and complement the primary methods of transmission electron micro… Show more

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Cited by 22 publications
(37 citation statements)
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“…In their bottom-up approach, Valtchev et al . carefully studied the crystallization kinetics under ambient temperature conditions, and proposed a mechanism for bottom-up formation, which views that the nucleation is initiated by an extensive exchange of species between solid and liquid phases during the induction period, and then crystal growth follows by an Ostwald ripening of the crystals 24 25 . However, in our opinion and from previous post-milling experiments, we postulate the following mechanism for the in situ recrystallization during bead milling.…”
Section: Resultsmentioning
confidence: 99%
“…In their bottom-up approach, Valtchev et al . carefully studied the crystallization kinetics under ambient temperature conditions, and proposed a mechanism for bottom-up formation, which views that the nucleation is initiated by an extensive exchange of species between solid and liquid phases during the induction period, and then crystal growth follows by an Ostwald ripening of the crystals 24 25 . However, in our opinion and from previous post-milling experiments, we postulate the following mechanism for the in situ recrystallization during bead milling.…”
Section: Resultsmentioning
confidence: 99%
“…Even though CG 40 was amorphous by XRD, the electron micrograph (Figure 1b)shows bright spots. Such bright spots in the electron micrograph of an aluminosilicate gel has been related to trapped liquids in a study on EMT[27]. Since such spots were not observed in the case of RG, we propose an alternative explanation, that these bright spots are indicative of small crystalline The CG 20 sample crystallizes at 50 °C within 4 days.…”
mentioning
confidence: 67%
“…This diameter ranging from 2 to 4 nm is comparable with the dimensions of the smallest pores observed in TEM images as well as with the void size observed in EMT-type alumosilicate zeolite precursor. 35 Voids with similar size were detected even in the completely crystalline RUB-17. These voids most probably origiante from the texture of the agglomerated crystals.…”
Section: Gisaxs Studymentioning
confidence: 90%
“…Porous precursor gel particles have been found in many aluminosilicate zeolite yielding systems containing high concentrations of alkali cations. [35][36][37] The appearance and development of voids has been identified as an essential stage of the nucleation process and consequently crucial for the zeolite formation. As far as we know, this is the first report on the observation of voids within gel particles in zincosilicate precursors yielding a zeolite-type material.…”
Section: Tem Microscopymentioning
confidence: 99%
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