Structure-Direction in Zeolite Synthesis

Lobo, Raúl F.; Zones, Stacey I.; Davis, Mark E.

doi:10.1007/978-94-011-0119-6_2

Cited by 198 publications

(328 citation statements)

References 42 publications

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“…However, advancements in the design of organic structure-directing agents 48 may change this situation. For example, a recent work by the Deem group 49 demonstrates a prototype approach for such a design.…”

Section: Analysis Of Top Performing Zeolite Structuresmentioning

confidence: 99%

Optimizing nanoporous materials for gas storage

Simon

Kim

Lin

et al. 2014

Phys. Chem. Chem. Phys.

119

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aIn this work, we address the question of which thermodynamic factors determine the deliverable capacity of methane in nanoporous materials. The deliverable capacity is one of the key factors that determines the performance of a material for methane storage in automotive fuel tanks. To obtain insights into how the molecular characteristics of a material are related to the deliverable capacity, we developed several statistical thermodynamic models. The predictions of these models are compared with the classical thermodynamics approach of Bhatia and Myers [Bhatia and Myers, Langmuir, 2005, 22, 1688] and with the results of molecular simulations in which we screen the International Zeolite Association (IZA) structure database and a hypothetical zeolite database of over 100 000 structures. Both the simulations and our models do not support the rule of thumb that, for methane storage, one should aim for an optimal heat of adsorption of 18.8 kJ mol À1. Instead, our models show that one can identify an optimal heat of adsorption, but that this optimal heat of adsorption depends on the structure of the material and can range from 8 to 23 kJ mol À1. The different models we have developed are aimed to determine how this optimal heat of adsorption is related to the molecular structure of the material.

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Section: Analysis Of Top Performing Zeolite Structuresmentioning

confidence: 99%

Optimizing nanoporous materials for gas storage

Simon

Kim

Lin

et al. 2014

Phys. Chem. Chem. Phys.

119

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“…4 In the preparation of high-silica zeolites it is very important to understand the role of the organic structure directing agents. [5][6][7] One of the key properties of an organic species is to direct the synthesis towards a certain microporous crystalline structure. In water solutions these organic molecules are hydrated, but the hydration is strongly depending on hydrophobic or hydrophilic properties.…”

Section: Introductionmentioning

confidence: 99%

In Situ Investigation of Si-TPA-MFI Crystallization Using (Ultra-) Small- and Wide-Angle X-ray Scattering

et al. 1997

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The formation of precursors and the growth and aggregation of silicalite-1 crystals using tetrapropylammonium as a template (Si-TPA-MFI) has been studied in situ using X-ray scattering techniques. Simultaneous smallangle and wide-angle X-ray scattering (respectively SAXS and WAXS) experiments using synchrotron light showed that the formation of amorphous colloidal aggregates in water clear synthesis mixtures was dependent on the alkalinity of the solutions. In situ time-resolved ultra-small-angle X-ray scattering (USAXS) showed the form factor oscillations of the growing crystals. Fitting of the USAXS patterns to the scattering pattern of spherical particles having a normal particle size distribution showed a linear growth of the average crystal diameter, which was approximately the same for both alkalinities studied. The final size of the crystals was highest for the synthesis mixture having the highest alkalinity, which can be explained in terms of number of viable nuclei formed. At the end of the linear growth the crystals form aggregates corresponding with a diffusion limited aggregation process (mass fractal dimension of 1.8).

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“…Since this early introduction of organic molecules in the preparative gel, many types of organic molecules have been studied as OSDA in aluminosilicate synthesis. Indeed, structural characteristics of the zeolite, such as pore and cavity dimensions, depend on the shape, size, and hydrophobicity of the OSDA molecule [9][10][11]. The use of OSDA in combination with small inorganic structure directing agents has allowed the direct synthesis of innumerable zeolites in the aluminosilicate form.…”

Section: Metals In Framework Positionsmentioning

confidence: 99%

Direct Synthesis of Functional Zeolitic Materials

Moliner

2012

ISRN Materials Science

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Recently, the direct synthesis of zeolitic materials has received much attention because several well-defined functionalities have been introduced in those materials by "one-pot" methodologies. The rationalization of the physics and chemistry of the processes involved in the zeolite growth has allowed the direct preparation of different functional molecular sieves with unique properties and potential applicability in industry. In the present paper, the "one-pot" preparations of metal-containing zeolites (both in framework and extra-framework positions), hybrid organic-inorganic molecular sieves, hierarchical microporous mesoporous zeotypes, nanosheets, nanozeolites, or template-free molecular sieves are intensively evaluated.

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Structure-Direction in Zeolite Synthesis

Cited by 198 publications

References 42 publications

Optimizing nanoporous materials for gas storage

Optimizing nanoporous materials for gas storage

In Situ Investigation of Si-TPA-MFI Crystallization Using (Ultra-) Small- and Wide-Angle X-ray Scattering

Direct Synthesis of Functional Zeolitic Materials

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