The influence of alkali cations on the synthesis of ZSM-5 in fluoride medium

Aiello, R.; Crea, F.; Nigro, E.; Testa, Flaviano; Mostowicz, R.; Fonseca, A.; Nagy, J.B.

doi:10.1016/s1387-1811(98)00241-8

Cited by 47 publications

(27 citation statements)

References 32 publications

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“…The acid catalysts used in this work were synthesised in our laboratories according to previously published procedures: standard acid ZSM-5 zeolite [18], nanocrystalline n-ZSM-5 zeolite [19], zeolite Beta [20], sol-gel Al-SBA-15 [13], hydrothermal Al-MCM-41 (hy) [21] and sol-gel Al-MCM-41 (sg) [22]. Amorphous silica (SiO 2 ), a non-acid porous solid, was also employed for comparative purposes.…”

Section: Catalystsmentioning

confidence: 99%

Catalytic activity of zeolitic and mesostructured catalysts in the cracking of pure and waste polyolefins

Aguado

Serrano

Miguel

et al. 2007

Journal of Analytical and Applied Pyrolysis

151

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Section: Catalystsmentioning

confidence: 99%

Catalytic activity of zeolitic and mesostructured catalysts in the cracking of pure and waste polyolefins

Aguado

Serrano

Miguel

et al. 2007

Journal of Analytical and Applied Pyrolysis

151

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“…However, when the forms of an oriented thin film and grain layer have to be constructed for novel applications, an elaborate geometric control of the crystal and its growth becomes necessary. So far, it has been known that MFI-type zeolites with various crystal shapes can be prepared, such as sphere-like, hexagonal twined disk, rod-like shape, and so on [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], although the euhedral shape is a coffin-like shape. Crystal shapes of the zeolites are influenced by the incorporation of a heteroatom, such as Al and Ti, into the MFI framework [9][10][11], and the type of a silica source [12][13][14][15], a template agent [16][17][18][19][20], and a fluoride salt in syntheses using fluoride ion [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Crystallization and crystal morphology of silicalite-1 prepared from silica gel using different amines as a base

Ban

Mitaku

Suzuki

et al. 2005

Journal of Crystal Growth

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“…The b channels and a channels are interconnected with each other, so diffusion along the c direction is also possible. It has been known that MFI-type zeolites with various crystal shapes can be prepared, such as spherical, hexagonal twined disk, rodlike, and so on [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68]. In the synthesis of Al-MFI, the various factors influencing the dimensions along each axis of the crystal have been investigated systematically [69].…”

Section: Morphology Control Of Mfi Zeolite Particles (Of Size Less Thmentioning

confidence: 99%

Morphological Synthesis of Zeolites

Park¹,

Jiang²

2010

Zeolites and Catalysis

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IntroductionZeolites are crystalline inorganic materials with unique, characteristic micropores. These micropores in molecular scale, which have one to three dimensions, are due to interconnected cavities or channels. The types of assembly of cavities or channels control the size of micropores, orientation of microporous channels, and the morphology of zeolite particles. Undoubtedly, the morphology is originally related to the framework type and also closely related to the micropore size, crystal size, and shape, and directly affects the physicochemical properties of zeolites.Zeolites are extensively used in the fields of heterogeneous catalysis, separations, ion exchange, chemical separation, adsorption, host/guest chemistry, microelectronic devices, optics, and membranes [1][2][3][4]. Such applications of zeolites are strongly affected by the pore size, type of channels, and morphologies [5-9]. Morphological synthesis of zeolites is particularly important in catalytic applications where the particle shape can have a dramatic effect on the product distribution due to differences in rates of transport/diffusion and reaction. Recent research interests have also been directed toward the crystallography of single zeolite crystals by applying nanotechnology. Thus, there has been a great interest in developing synthetic approaches to control crystal size and morphology of zeolites [9][10][11].Fine-tuning of zeolite crystal size and shape is usually accomplished by systematic variation of the composition of the precursor mixture (including the use of additives such as salts) [12]. But through the development of new technology and equipment, synthetic parameters such as temperature, pressure, and stirring rate or even gravity can be controlled.This chapter provides a brief introduction to the morphological synthesis of zeolites and related fabrication methods such as as microwave. Examples in the preparation of well-shaped single crystals, fine control of common particles, and microwave driven fabrication are discussed.

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The influence of alkali cations on the synthesis of ZSM-5 in fluoride medium

Cited by 47 publications

References 32 publications

Catalytic activity of zeolitic and mesostructured catalysts in the cracking of pure and waste polyolefins

Catalytic activity of zeolitic and mesostructured catalysts in the cracking of pure and waste polyolefins

Crystallization and crystal morphology of silicalite-1 prepared from silica gel using different amines as a base

Morphological Synthesis of Zeolites

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