02-O-02 - Nucleation processes in zeolite synthesis revealed through the use of different temperature-time profiles

Cundy, Colin S.; Forrest, James O.; Plaisted, R.J.

doi:10.1016/s0167-2991(01)81215-5

Cited by 7 publications

(10 citation statements)

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“…Similarly, in colloidal silicalite synthesis, the different rates of temperature rise achievable by microwave and thermal heating made it possible to distinguish between the crystal population nucleated during the heating process and that arising from proto-nuclei generated during the roomtemperature aging of the precursor sols. 379 A very rapid (3 min) microwave crystallization of ZSM-5 probably reflected a contribution from the interfacial superheating of nanocrystal seeds. 111 However, under near-equilibrium conditions, there was no significant difference between the crystal linear growth rates in thermally and microwave heated reactions, the growing crystals acting in this case as a form of internal thermometer.…”

Section: Microwave Dielectric Heatingmentioning

confidence: 99%

“…Such selectivity is largely attributable to the high heating rates attainable in microwave syntheses and their effect upon the rival rates of nucleation and growth of competing phases (in this case, zeolites Y and P). Similarly, in colloidal silicalite synthesis, the different rates of temperature rise achievable by microwave and thermal heating made it possible to distinguish between the crystal population nucleated during the heating process and that arising from proto-nuclei generated during the room-temperature aging of the precursor sols . A very rapid (3 min) microwave crystallization of ZSM-5 probably reflected a contribution from the interfacial superheating of nanocrystal seeds .…”

Section: B Progress In Experimental Techniques1 Microwave Dielectric ...mentioning

confidence: 99%

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The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time

Cundy¹,

Cox²

2003

Chem. Rev.

1,845

1,072

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Use of Fas a Mineralizer in Zeolite Synthesis 671 2. Polymeric Templates 671 3. MazzitesFirst Synthetic Phase Found as a Mineral 672 D. Advances in the Study and Understanding of Zeolite Synthesis 672 V. 1980s: AlPO 4 s and the Decade of Spectroscopy 674 A. AlPO 4 Molecular Sieves and the Breaking of the 12-T-Ring Barrier 674 B. Mathematical Models of Zeolite Synthesis 675 C. Advances in Spectroscopy 676 D. "Global" Investigations of Zeolite Synthesis 677 E. Studies on the Genesis of Zeolite Crystal Morphology 678 F. X-Ray Amorphous Zeolites and Early Development of Zeolitic Structure 678 G. Other Significant Advances of the 1980s 679 1. The Role of Organic Templates 679 2. Alkali-Metal Free Zeolite SynthesissUse of NH 4 + −R 4 N + Systems 679 3. Syntheses in Nonaqueous Media 679 4. Deuterium Isotope Effect 679 5. Secondary Synthesis and Lattice Lability 679 6. Titanium Silicalite (TS-1) 680 7. Titanium Molecular Sieves (ETS-4 and ETS-10) 680 VI. 1990s: Mesoporous Materials and the Decade of High Technology A. Mesoporous Materials: Genesis in Japan and the USA 10.

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Section: Microwave Dielectric Heatingmentioning

confidence: 99%

Section: B Progress In Experimental Techniques1 Microwave Dielectric ...mentioning

confidence: 99%

The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time

Cundy¹,

Cox²

2003

Chem. Rev.

1,845

1,072

View full text Add to dashboard Cite

show abstract

“…Cundy et al found that, for aging times of up to 50 days, the product crystal size is sensitive to crystallization temperature and heating rate. 61 They tested temperatures of 90, 100, 150, and 175 °C (conventional heating) and 100 and 175 °C (microwave heating). After this aging time (50 days), the product size was independent of reaction temperature and type of heating.…”

Section: Silica Molecular Sieves (Types Mfi and Mel)mentioning

confidence: 99%

Nanozeolites: Synthesis, Crystallization Mechanism, and Applications

2005

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This review focuses on the synthesis, crystallization mechanism, and application of colloidal zeolites. The synthesis formulations and features of different zeolite-type structures prepared in nanosized form are summarized. Special attention is paid to zeolites prepared as stable colloidal suspensions. Next, new insights into zeolite crystallization mechanism gained by using colloidal zeolites as model systems are discussed. Further, the methods for deposition of zeolite nanocrystals from suspensions onto supports of different shapes and compositions used for the fabrication of zeolite films and membranes are reviewed. The use of colloidal zeolites for the fabrication of hierarchical macrostructures is also described. Other uses of nanozeolites for the preparation of functionalized materials, for the synthesis of mesoporous silicas of improved hydrothermal stability, and as seeds for zeolite syntheses are illustrated. The emerging applications of nanozeolites in sensing, optoelectronics, and medicine constitute another topic in this review. Finally, some future trends in the area are envisaged.

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“…The addition of seed crystals of the desired zeolite phase in the synthesis gel generally leads to a faster consumption of reagents and/or secondary nucleation mechanism 30 , resulting in higher crystallization rates [31][32][33][34] as well as allowing control of the crystal size distribution 35 . The use of crystallization seeds combined with a less expensive structure-directing agent is one of the alternatives to produce the SSZ-13 with shorter times, which makes the synthesis more economical and with greater potential for industrial application.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Synthesis of Zeolite SSZ-13 using Choline Chloride and Different Crystallization Seeds and its Application in the Thermocatalytic Degradation of Ultra-High Molecular Weight Polyethylene

et al. 2021

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The synthesis of SSZ-13 was studied by evaluating the influence of two types of crystallization seeds with CHA structure (S 1 seeds prepared in fluoride medium and S 2 seeds by the conversion of zeolite Y), SiO 2 /Al 2 O 3 (28, 40, 60 and 100) and OH/SiO 2 (0.6 and 0.8) ratios. Choline chloride was used as the structure-directing agent and the crystallizations occurred at 140 ºC from 24 to 96 h. S 1 seeds led to the coexistence of zeolites SSZ-13 and P, while S 2 seeds promoted in all SiO 2 /Al 2 O 3 ratios and OH/SiO 2 = 0.8, the formation of pure SSZ-13 after 24 h. The SSZ-13 samples are formed by clusters of crystals with cuboid-like morphology and exhibited textural properties typical of CHA framework. SSZ-13 zeolite led to a decrease in the temperature and the activation energy required for the degradation of ultra-high molecular weight polyethylene polymer, demonstrating its efficiency as catalyst in this process.

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02-O-02 - Nucleation processes in zeolite synthesis revealed through the use of different temperature-time profiles

Cited by 7 publications

References 0 publications

The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time

The Hydrothermal Synthesis of Zeolites: History and Development from the Earliest Days to the Present Time

Nanozeolites: Synthesis, Crystallization Mechanism, and Applications

Evaluation of the Synthesis of Zeolite SSZ-13 using Choline Chloride and Different Crystallization Seeds and its Application in the Thermocatalytic Degradation of Ultra-High Molecular Weight Polyethylene

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