Crystallization of silicalite-1 in the presence of fluoride ions

Mostowicz, R.; Crea, F.; B-Nagy, J.

doi:10.1016/0144-2449(93)90142-p

Cited by 27 publications

(24 citation statements)

References 5 publications

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“…Silicalite-1 crystals were prepared in fluoride media and in the absence of hydroxyl ions in order to minimize the concentration of structural defects and silanol groups in the zeolite according to the procedure reported by Mostowicz et al [26]. In short, the synthesis was carried out in a Teflon-lined steel autoclave at 170°C for 18 h using a synthesis mixture with a molar composition of:…”

Section: Methodsmentioning

confidence: 99%

Dynamic properties of water in silicalite-1 powder

Филиппов

Dvinskikh

Khakimov

et al. 2012

Magnetic Resonance Imaging

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Section: Methodsmentioning

confidence: 99%

Dynamic properties of water in silicalite-1 powder

Филиппов

Dvinskikh

Khakimov

et al. 2012

Magnetic Resonance Imaging

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“…4.5 kHz in a zirconia rotor of 7.5 mm outer diameter. 29 Si NMR signals were externally references to a sample of TMS in a small glass capillary, which was placed in an empty 7.5 mm rotor to minimize errors due to differences in magnetic susceptibility of the liquid reference and solid test samples.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Colloidal Defect-Free Silicalite-1 Single Crystals: Preparation, Structure Characterization, Adsorption, and Separation Properties for Alcohol/Water Mixtures

Zhou¹,

Mouzon²,

Farzaneh³

et al. 2015

Langmuir

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In this work, colloidal silicalite-1 single crystals are for the first time synthesized using fluoride as mineralizing agent at near neutral pH. SEM, TEM, DLS, XRD, solid-state (29)Si MAS NMR, and adsorption/desorption experiments using nitrogen, water, n-butanol, and ethanol as adsorbates were used to characterize the crystals. The single crystals have a platelike habit with a length of less than 170 nm and an aspect ratio (length/width) of about 1.2, and the thickness of the crystals is less than 40 nm. Compared with silicalite-1 crystals grown using hydroxide as mineralizing agent, the amount of structural defects in the lattice is significantly reduced and the hydrophobicity is increased. Membrane separation and adsorption results show that the synthesized defect-free crystals present high selectivity to alcohols from alcohol/water mixtures. The n-butanol/water adsorption selectivities were ca. 165 and 14 for the defect-free crystals and a reference sample containing defects, respectively, illustrating the improvement in n-butanol/water selectivity by eliminating the polar silanol defects.

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“…In the base solution, NaF molecules are completely dissociated to Na þ and F À ions. It is highly probable that the added F À ions reverses the condensation reactions from Si(OH) 4 With SiO 2 instead of TEOS as Si source, the product CE4 obtained in the absence of NaF is mainly composed of ZnO and SiO 2 , together with minor impurities (Fig. 3d).…”

Section: Resultsmentioning

confidence: 94%

“…Valero et al reported that under alkaline hydrothermal conditions, F À ions could promote the crystallization of ZrSiO 4 and lower the synthesizing temperature [2,3]. Mostowicz et al also found a similar effect of F À ions on the crystallization of zeolite [4]. However, the effect of F À ions on the silicon species in these cases is still unclear and not sufficiently investigated.…”

Section: Introductionmentioning

confidence: 90%