Zeolite beta films synthesized from basic and near-neutral precursor solutions and gels

Tosheva, Lubomira; Hölzl, M.; Metzger, T. H.; Valtchev, Valentin; Mintova, Svetlana; Bein, Thomas

doi:10.1016/j.msec.2005.07.011

Cited by 17 publications

(12 citation statements)

References 12 publications

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“…The broad peak between 6.5 and 8.5° and the intense peak at 22.5° are the characteristic peaks of zeolite beta. The characteristic peaks for zeolite A were also observed at 2θ values of 21.7, 24, 27.2, and 30° 20, 21. The particle sizes were approximately in the range of 1.3–1.6 μm for AgA and 0.7–1.2 μm for cAgBeta as shown in the scanning electron micrographs presented in Figure 2.…”

Section: Resultsmentioning

confidence: 70%

Preparation and characterization of antibacterial zeolite–polyurethane composites

Kamisoglu

Aksoy

Akata

et al. 2008

J of Applied Polymer Sci

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In this study, antibacterial properties were induced in polyurethane (PU) films by the incorporation of Ag þ -loaded zeolites as fillers. The mechanical and thermal properties of the prepared composites were also investigated. For this purpose, two different types of zeolite microparticles, high-silica zeolite beta crystals and low-silica zeolite A crystals, were synthesized. Ag þ was added by ion exchange, and these particles were incorporated into the PU prepolymer, which was prepared from its main components of toluene diisocyanate and polypropylene ethylene glycol (medical purity). Microbiological tests revealed that both types of composites, prepared by the addition of Ag þ -containing zeolite beta or zeolite A to the PU matrix, had antibacterial properties. It was demonstrated for the first time that a high-silica zeolite (zeolite beta) and its composite film could be effectively employed as antibacterial materials. Furthermore, mechanical and thermal characterization of the composites showed that the zeolites enhanced the mechanical properties of the polymer and did not cause any deterioration in its thermal properties.

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Section: Resultsmentioning

confidence: 70%

Preparation and characterization of antibacterial zeolite–polyurethane composites

Kamisoglu

Aksoy

Akata

et al. 2008

J of Applied Polymer Sci

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“…Generally, the precursor gel used for pure-silica *BEA powder synthesis has a low H 2 O/SiO 2 ratio and high viscosity [24,25]. However, a precursor gel with high viscosity tends to be nonuniform and leads to a reduction in reproducibility, so it is not preferable to use it as a precursor gel for membrane synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…However, most of these membranes contain a large amount of Al in the framework. The hydrophobic pure-silica *BEA zeolite has a very narrow synthesis range and its synthesis and membrane formation are difficult [23,24,25,26]. Thus, the only reported example of a pure-silica *BEA film and membrane is on a flat-type support, which is easy to synthesize [26,27,28].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic *BEA-Type Zeolite Membranes on Tubular Silica Supports for Alcohol/Water Separation by Pervaporation

et al. 2019

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Hydrophobic pure-silica *BEA-type zeolite membranes with large pores were prepared on tubular silica supports by hydrothermal synthesis using a secondary growth method and were applied to the separation of alcohol/water mixtures by pervaporation (PV), an alternative energy-efficient process for production of biofuels. Amorphous pure-silica tubular silica supports, free of Al atoms, were used for preparing the membranes. In this study, the effects of the synthesis conditions, such as the H2O/SiO2 and NH4F/SiO2 ratios in the synthetic gel, on the membrane formation process and separation performance were systematically investigated. The successfully prepared dense and continuous membranes exhibited alcohol selectivity and high flux for the separation of ethanol/water and butanol/water mixtures. The pure-silica *BEA membranes obtained under optimal conditions (0.08SiO2:0.5TEAOH:0.7NH4F:8H2O) showed high PV performance with a separation factor of 229 and a flux of 0.62 kg·m−2·h−1 for a 1 wt % n-butanol/water mixture at 318 K. This result was attributed to the hydrophobicity and large pore size of the pure-silica *BEA membrane. This was the first successful synthesis of hydrophobic large-pore zeolite membranes on tubular supports with alcohol selectivity, and the obtained results could provide new insights into the research on hydrophobic membranes with high permeability.

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“…The fl uoride-based synthesis has been also used in preparation of zeolite membranes. Zeolite beta fi lms prepared by seeded growth in fl uoride media (SiO 2 : 0.5TEAF: 5H 2 O) at 150 °C for 4 days were very rough with a thickness exceeding 20 μm and were composed of well-faceted uniform 2.5-3 μm truncated square dipyramidal crystals [ 97 ]. Zhu et al reported an improved method in fl uoride media at 140 °C for 2 days to synthesize (h0l) oriented high-silica beta membrane with a thickness of 2 μm [ 98 ].…”

Section: Fluoride-mediated Synthesismentioning

confidence: 99%

Zeolite Thin Films and Membranes: From Fundamental to Applications

Wang

Yan

2016

Green Chemistry and Sustainable Technology

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Zeolite fi lms and membranes have extensively been investigated since 1992. Many new preparation methods and concepts have been developed, such as microwave synthesis, intergrowth supporting substances, covalent linker synthesis, inner-side synthesis, fl uoride-mediated synthesis, variable-temperature synthesis, masking technique, counter-diffusion secondary growth, and pore-plugging synthesis. The remarkable progress made in the preparation has stimulated many application researches of zeolite fi lms and membranes, such as dehydration of various organic solvents, organics extraction from organic/water mixtures, separation of organic mixtures, gas separation, oil-water separation, desalination of seawater, membrane reactors, membrane microreactors, low-k materials, corrosion-resistant materials, sensors, fuel cells, and batteries. The recent progress in preparation and applications of zeolite membranes from 2000 has been summarized in this chapter.

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Zeolite beta films synthesized from basic and near-neutral precursor solutions and gels

Cited by 17 publications

References 12 publications

Preparation and characterization of antibacterial zeolite–polyurethane composites

Preparation and characterization of antibacterial zeolite–polyurethane composites

Hydrophobic *BEA-Type Zeolite Membranes on Tubular Silica Supports for Alcohol/Water Separation by Pervaporation

Zeolite Thin Films and Membranes: From Fundamental to Applications

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