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Zeolite Synthesis | Mark E. Davis Research Group

Development of redox-active zeolites by intracrystalline synthesis of metal Schiff base and polyamine complexes

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Zeolites and their synthesis - ScienceDirect

Cation exchange is exploited in water softening, where alkali metals such as Na+ or K+ in zeolite framework are replaced by Ca2+ and Mg2+ ions from water. Many commercial washing powders thus contain substantial amounts of zeolites that enhance washing efficiency. LTA have the largest scale production of synthetic zeolites for use as "builders" in domestic and commercial detergents to remove the calcium and magnesium "hardness" .

Zeolites and Their Synthesis, 1981 - Download as PDF File (.pdf), Text File (.txt) or read online.

Topics include the conversion of ethanol to hydrocarbons over zeolite catalysts; air pollution catalytic control by metal promoted zeolites; zeolite from fly ash-iron oxide magnetic nanocomposites; application of zeolite containing rocks in berry crop growing; and dealuminated zeolites in biological systems.

Zeolites and their synthesis Richard M

Examplesare the use of titanium ZSM-5 in the production of caprolactam, and copper zeolites in NOx decomposition.

Metal-exchanged zeolites can serve as oxidation or reduction catalysts, e. g. Ti-ZSM-5 in the production of caprolactam, and Cu-zeolites in NOx decomposition. They have been employed on diesel vehicles as a less costly and more effective option for NOx removal than the three-way catalytic converter.

Hydrogen-exchanged zeolites, whose framework-bound protons give rise to very high acidity are exploited in many organic reactions, including crude oil cracking, isomerisation and fuel synthesis. Because of high selectivity of zeolites, they are often the most efficient and cost-effective method for a number of refinery conversions .

Synthesis of Zeolites - ScienceDirect

In the case of shape-selective catalysis in zeolites, the combination of both properties exploited to control the selectivity of catalytically conducted reactions.

Cation-containing zeolites are extensively used as desiccants due to their high affinity for water, and also find applications in gas separation, where molecules are differentiated on the basis of their electrostatic interactions with the metal ions. Conversely, hydrophobic silica zeolites preferentially absorb organic solvents. Zeolites can thus separate molecules based on differences of size, shape and polarity.

In this book, the authors present current research in the study of the synthesis, chemistry and applications of zeolites.
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  • Direct Synthesis of Functional Zeolitic Materials - Hindawi

    Zeolites canalso serve as oxidation or reduction catalysts, often after metals have been introduced into the framework.

  • Chemistry of Zeolites and Related Porous Materials: Synthesis and ..

    Extra Large Pore Zeolites

  • such as zeolites has been greatly extended ..

    Before the synthesis of VPI-5, the largest zeolites had pore sizes below 10 angstroms

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Synthesis, and Modification of Zeolites.

Highly crystalline MOR-type zeolites with a Si/Al ratio of approximately 30 ...Highly crystalline MOR-type zeolites with a Si/Al ratio of ca.

Synthesis of NaA zeolite from kaolin source | …

Increasingly, attention has focused on fine-tuning the properties of zeolite catalysts in order to carry out very specific syntheses of high-value chemicals e.g.

Synthesis and Characterization of Ca and Na Zeolites …

Hydrothermal transformation of perlite (a natural rhyolitic glass) to calcium zeolites is investigated as a first step towards developing synthesis procedures for the preparation of calcium and other alkaline-earth zeolites from pure starting reagents. In particular, synthetic analogues of the calcium zeolites gismondine, heulandite and epistilbite are obtained as alteration products of perlite glass reacting with calcium-containing solutions. The influence of the solution phase species and their concentrations, the pH and the temperature on the distribution of the zeolite products obtained are discussed. It is observed that the crystallization of heulandite from perlite is preceded by the transient formation of a gismondine-type zeolite most similar to the synthetic zeolite P1. This information is exploited to devise methodology for the preparation of zeolite P1 from pure starting reagents and its subsequent conversion to calcium and other alkaline-earth zeolites upon treatment with solutions containing alkaline-earth cations. Thus, a novel approach for the synthesis of alkaline-earth zeolites based on the hydrothermal conversion of zeolite P1 is developed. Details of the synthesis procedures are enumerated for the preparation of alkaline-earth zeolites CIT-3 (HEU), CIT-4 (BRE), epistilbite (EPI), harmotome (PHI), and yugawaralite (YUG). Transformation of zeolite P1 to alkaline-earth zeolites is governed by factors such as the Si/Al ratio of the starting P1 material, the composition of the solution phase and the presence or absence of seed crystals. The effects of these factors on the products obtained, i.e., phase selectivity, are discussed.

Zeolites: Synthesis, Chemistry and Applications

Zeolite molecular sieves have found extensive applications in ion-exchange, separation and catalytic processes, particularly in the chemical and petroleum industries. Currently, the state-of-the-art in synthesis of high-silica zeolites involves the use of complex organic molecules to direct the formation of zeolitic materials with novel pore structures. While efforts towards preparation of new zeolites using organic molecules as structure-directing agents continues, synthesis of calcium and other alkaline-earth zeolites has not received much attention since the inception of the systematic investigation of zeolite synthesis some 35 years ago. Of the approximate 50 natural zeolites discovered to date, over 20% have eluded synthesis and another 10% have proven exceedingly difficult to synthesize at typical hydrothermal conditions. The overwhelming majority of these zeolites are calcium-dominant. The difficulty encountered in the synthesis of these alkaline-earth zeolites is in direct contrast to their natural occurrence as alteration products of volcanic glasses. Thus, the objective of this work is developing practical methodolgies for the synthesis of alkaline-earth zeolites.

EP1229001A1 - Synthesis of zeolites - Google Patents

Zeolite molecular sieves have found extensive applications in ion-exchange, separation and catalytic processes, particularly in the chemical and petroleum industries. Currently, the state-of-the-art in synthesis of high-silica zeolites involves the use of complex organic molecules to direct the formation of zeolitic materials with novel pore structures. While efforts towards preparation of new zeolites using organic molecules as structure-directing agents continues, synthesis of calcium and other alkaline-earth zeolites has not received much attention since the inception of the systematic investigation of zeolite synthesis some 35 years ago. Of the approximate 50 natural zeolites discovered to date, over 20% have eluded synthesis and another 10% have proven exceedingly difficult to synthesize at typical hydrothermal conditions. The overwhelming majority of these zeolites are calcium-dominant. The difficulty encountered in the synthesis of these alkaline-earth zeolites is in direct contrast to their natural occurrence as alteration products of volcanic glasses. Thus, the objective of this work is developing practical methodolgies for the synthesis of alkaline-earth zeolites.Hydrothermal transformation of perlite (a natural rhyolitic glass) to calcium zeolites is investigated as a first step towards developing synthesis procedures for the preparation of calcium and other alkaline-earth zeolites from pure starting reagents. In particular, synthetic analogues of the calcium zeolites gismondine, heulandite and epistilbite are obtained as alteration products of perlite glass reacting with calcium-containing solutions. The influence of the solution phase species and their concentrations, the pH and the temperature on the distribution of the zeolite products obtained are discussed. It is observed that the crystallization of heulandite from perlite is preceded by the transient formation of a gismondine-type zeolite most similar to the synthetic zeolite P1. This information is exploited to devise methodology for the preparation of zeolite P1 from pure starting reagents and its subsequent conversion to calcium and other alkaline-earth zeolites upon treatment with solutions containing alkaline-earth cations. Thus, a novel approach for the synthesis of alkaline-earth zeolites based on the hydrothermal conversion of zeolite P1 is developed. Details of the synthesis procedures are enumerated for the preparation of alkaline-earth zeolites CIT-3 (HEU), CIT-4 (BRE), epistilbite (EPI), harmotome (PHI), and yugawaralite (YUG). Transformation of zeolite P1 to alkaline-earth zeolites is governed by factors such as the Si/Al ratio of the starting P1 material, the composition of the solution phase and the presence or absence of seed crystals. The effects of these factors on the products obtained, i.e., phase selectivity, are discussed.

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