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

Bronić, Josip; Mužic, Ana; Jelić, Tatjana Antonić; Kontrec, Jasminka; Subotić, Boris

doi:10.1016/j.jcrysgro.2008.08.044

Cited by 14 publications

(7 citation statements)

References 53 publications

(156 reference statements)

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“…In the same way of the hostguest mechanism, it was found that gossypol, a phenolic yellow pigment extracted from cotton seeds with a zeolitelike structure, was able to form a brown crystal complex with molecular iodine as (gossypol) 8 ·I 2 [33]. Indeed, the hostguest interaction was quantified with the zeolitemolecular iodine system, formed with sublimed iodine [34]; the iodine was found to diffuse in α and β voids of the zeolite framework, accom panied with a color change of samples from white (zeolite A) to dark or brownred.…”

Section: Molecular Iodine In Polymer Complexationmentioning

confidence: 93%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

166

127

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A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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Section: Molecular Iodine In Polymer Complexationmentioning

confidence: 93%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

166

127

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“…Generally, a smaller crystal size indicates a larger number of crystals in the system when the solid yield remains constant. 31 In this study, we did not observe a significant difference in the solid yields of the ZSM-5 crystals (Table S1); thus, their crystal sizes could be regarded as an indicator that reflects the number of crystals in the system. Furthermore, recalling that the formation of zeolite crystal could start from a relatively ordered structure, which is stable enough to serve as a nucleus, the number of crystals may then represent the number of nuclei in the system, assuming that each nucleus can grow to a crystal without being decomposed or consumed.…”

Section: Resultsmentioning

confidence: 96%

Understanding the Nucleation and Crystal Growth of Zeolites: A Case Study on the Crystallization of ZSM-5 from a Hydrogel System Under Ultrasonication

et al. 2020

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For the preparation of zeolites, ultrasonication is an efficient pretreatment that homogenizes the reactant mixture prior to hydrothermal synthesis. However, very few studies directly employ ultrasonication during hydrothermal synthesis, and the effect of ultrasonication on zeolite crystallization has not been fully understood yet. Herein, we report the crystallization behavior of ZSM-5 zeolite in the presence of ultrasonication. We demonstrated that the crystallization time decreases with the irradiation power (97, 194, and 323 W), while the irradiation power also regulates the nucleation and crystal growth of ZSM-5 to produce crystals with different sizes. To understand the role of ultrasonication, the evolution of aluminosilicate particles was investigated in terms of morphology, compositions, and structural information. During the induction period, the incorporation of organic cations to the solid phase, which is essential to the nucleation of ZSM-5 in this system, was enhanced under 323 W irradiation. In addition, a relatively uniform fusion behavior of the aluminosilicate particles was observed in the ultrasonic system, which produced an abundance of tiny crystals. Finally, it was shown that the enhanced crystal growth rate under ultrasonication was possibly due to the increased amount of silanol groups on the crystal surface, which facilitated the condensation between aluminosilicate species.

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“…In addition to the complexity of the process, a serious difficulty in its detailed empathetic is the big diversity of original systems employed in zeolite crystallization [57][58][59]. Considering over 180 available zeolite types with different in composition and frameworks, their syntheses necessitate vast variety of chemical precursors.…”

Section: Effect Of Scw On the Rapid Formation Of Zsm-5 Nanocrystalsmentioning

confidence: 99%