Transient crystallization and crystal size distribution of zeolite A

Chen, Wen H.; Hu, Hsing C.; Lee, Ting Y.

doi:10.1016/0009-2509(93)81025-q

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…It is postulated that much of this transformation occurs in the vicinity of the solid gel phase. In a recent paper Chen et al use a modified population balance model to propose that growth at the surface of crystals is the rate-determining step . For simplicity they proposed a model where half a pseudocell is precipitated at a time.…”

Section: Discussionmentioning

confidence: 99%

“…The methodology involves using representative crystallite size as a measure of the rate of crystal growth. In the case of zeolite A a more detailed analysis enabled the nucleation and growth curves to be calculated under a range of synthesis conditions. − Over a number of years Thompson et al have developed mathematical models to study zeolite crystallization and nucleation behavior using the population balance model. Chen et al describe a similar approach.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of zeolite A a more detailed analysis enabled the nucleation and growth curves to be calculated under a range of synthesis conditions. − Over a number of years Thompson et al have developed mathematical models to study zeolite crystallization and nucleation behavior using the population balance model. Chen et al describe a similar approach. Both groups claim good agreement between experimental and calculated growth curves.…”

Section: Introductionmentioning

confidence: 99%

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Direct Observation of Zeolite A Synthesis by in Situ Solid-State NMR

1996

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This paper describes the use of in situ solid-state NMR and X-ray powder diffraction to study the real-time synthesis of zeolite A. In particular 27Al and 29Si are used to monitor the growth of the crystalline phase and the species which occur in solution and the gel phases. A parallel in situ X-ray diffraction study was used to investigate the development of long-range order of the material. Conclusions concerning the mechanism of the formation of zeolite A are proposed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct Observation of Zeolite A Synthesis by in Situ Solid-State NMR

1996

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“…Many techniques have been used to gain an insight into the complex processes occurring between nucleation and completion of crystallization in zeolite A: scanning electron microscopy, transmission electron microscopy, optical microscopy, and powder X-ray diffraction are commonly used to analyze final particle-size distributions and crystallinity; − elemental analysis may be used to follow the concentrations of silicate, aluminate, and sodium oxide in the liquid phase; , infrared spectroscopy yields information on structural features; and quasielastic light-scattering spectroscopy of clear gel solutions may be used to follow submicron particles in the parent solutions. , Various aspects of the synthesis have been studied with these techniques, including crystallization kinetics, gel pH, effect of amorphous seeding, initial bred nuclei, gel aging, and the addition of aged mother liquor.…”

Section: Introductionmentioning

confidence: 99%

Crystallization in Zeolite A Studied by Atomic Force Microscopy

et al. 1998

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Crystal growth in zeolite A has been studied by atomic force microscopy (AFM), which is a very powerful technique for imaging nanoscale surface features. However, imaging microcrystallites is far from trivial due to the difficulty in controlling their orientationsurfaces inclined to the horizontal yield distorted images in an AFM. In this study the origin and correction of image distortion is discussed and a general method for sample preparation that can be easily adapted to any microcrystalline powder is detailed. Crystal growth in zeolite A, chosen for its industrial importance, is discussed in detail and is shown to occur via a process akin to a terrace−ledge−kink (TLK) layer mechanism.

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“…Most hydrothermal syntheses of zeolites use gel 1,2 or clear solution 3,4 for starting materials. These methods react very fast, and the size of the synthetic crystals is small.…”

Section: Introductionmentioning

confidence: 99%

The Kinetics of Analcime Synthesis in Alkaline Solution

Fang¹,

Lin

et al. 2004

J Chinese Chemical Soc

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In this study glass has been used as a starting material in order to increase the resolution of the experiment and establish the kinetics of analcimes during hydrothermal synthesis. The experimental results show that the crystal growth curves represent two-stage linear growth. The first stage is marked by rapid crystal growth whilst the second stage indicates much slower growth. The nuclei appear before the crystals start growing. The crystal growth rate is dependent on the experimental conditions. The nucleation rate increases as the glass dissolves and reaches a maximum when the glass is completely dissolved. Thereafter, the concentration decreases with the consumption of nutrients, and both nucleation and crystal growth stops when supersaturation occurs.

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Transient crystallization and crystal size distribution of zeolite A

Cited by 16 publications

References 7 publications

Direct Observation of Zeolite A Synthesis by in Situ Solid-State NMR

Direct Observation of Zeolite A Synthesis by in Situ Solid-State NMR

Crystallization in Zeolite A Studied by Atomic Force Microscopy

The Kinetics of Analcime Synthesis in Alkaline Solution

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