The preparation and analysis of zeolite ZSM-5 membranes on porous alumina supports

Oonkhanond, Bovornlak; Mullins, Michael E.

doi:10.1016/s0376-7388(01)00449-5

Cited by 33 publications

(18 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An element map of the sample cross-sections was obtained with an energy dispersive X-ray spectrometer, attached to the TEM, to clearly distinguish between the zeolite and alumina areas [21].…”

Section: Methodsmentioning

confidence: 99%

“…A negative surface charge is reported for zeolite powders and a-Al 2 O 3 in basic media [9,21] so that electrostatic double layer repulsion inhibits the adsorption of zeolite particles (in particular A) onto the a-Al 2 O 3 substrate. And vice versa, a FULL PAPER Continuous, thin, oriented zeolite A membranes are produced by a two-step synthesis on macroporous a-Al 2 O 3 supports.…”

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationmentioning

confidence: 99%

“…[21] Therefore, a zeolite A seed layer was prepared by surface modification of the support with a cationic polymer, poly(diallyldimethylammonium chloride) (PDDA), [22][23][24][25] followed by selective adsorption from a suspension mixture of negatively charged zeolite A and Y particles at optimized pH.…”

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Kuzniatsova

Mottern

Chiu

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

Continuous, thin, oriented zeolite A membranes are produced by a two‐step synthesis on macroporous α‐Al2O3 supports. In the first step, zeolite A nano‐cubes with ∼350‐nm edges are prepared as a native impurity phase in zeolite Y synthesis dispersions, the support surface is pre‐modified with a cationic polymer having a selective affinity for zeolite A. The thus‐treated support is contacted with a colloidally stable dispersion of zeolite A and Y mixture in water, which results in selective, dense‐packed deposition of the zeolite A cubes with one face aligned to the average support surface. In a second step of hydrothermal epitaxial growth, the seed layer grows epitaxially into a continuous, meso‐defect free, ∼1 µm thick zeolite A layer, already after 1 h of treatment. This microstructure of the membrane compares very favorably to what is commonly obtained. The pH value of the zeolite mixture suspension is found to have a major influence on seed layer morphology, and thereby, on the quality and orientation of zeolite A membrane after short synthesis times. The final zeolite A membrane thickness and morphology is controlled by varying secondary growth synthesis time. The approach presented is thought to be of generic use for the preparation of oriented zeolite membranes.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationmentioning

confidence: 99%

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Kuzniatsova

Mottern

Chiu

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…[5] To ultimately realize such devices, however, new techniques for manipulating these novel materials into large-area and layered thin films with precisely controlled thickness and molecular architecture are needed. [6] The layer-by-layer (LBL) assembly technique currently represents one of the simplest and most versatile thin-film processing routes available for the construction of nanoscale devices from a variety of polymers, inorganic nanoparticles, and biological molecules. [7,8] This method mainly relies on electrostatic interactions between sequentially adsorbed polyanions and polycations on charged surfaces, though other intermolecular forces have also been implemented including hydrogen bonding, coordination bonding, and charge-transfer interactions.…”

Section: Methodsmentioning

confidence: 99%

Zeolite Coatings on Microcellular Ceramic Foams: A Novel Route to Microreactor and Microseparator Devices

et al. 2004

View full text Add to dashboard Cite

Zeolites are microporous crystalline aluminosilicates with molecular sieving capabilities (pore size < 1.3 nm).[1±3] The use of zeolite coatings on different supports (metal substrates, porous glass, ceramic honeycombs, mesoporous materials) has recently been proposed for catalysis, adsorption, and separation.[4±8] Open-cell ceramic foams [9±15] (connected pores in the 0.1±4 mm range) are gaining interest as zeolite carriers [11±15] due to their unique properties, for the development of new reactor concepts (monolithic, catalytic wall configurations) for technical catalytic and adsorption±separation processes. [15,16] Here we present, for the first time, a novel zeolite±ceramic composite material, with a bimodal (nano-, macroscale) pore system, obtained by coating the cell walls of microcellular polymer-derived ceramic foams (cell size~8 lm) with a thin, binder-free layer of MFI-type zeolite (Silicalite-1 and ZSM-5), produced by an in-situ conventional supported hydrothermal synthesis. To our knowledge, these materials represent the smallest microreactors/separators fabricated to date.Ceramic foams, with low thermal expansion coefficients and high thermal, mechanical, and chemical stability, are suitable as zeolite supports because they provide enhanced mass and heat transfer and a low pressure drop when compared to zeolite pellets used in fixed-bed reactors. [9,10] The fabrication of ceramic foams from preceramic polymers allows tailoring of the composition and morphology, and therefore of the final properties, of the porous material. [17,18] Very recently, [19,20] we fabricated mechanically stable ceramic microcellular [21,22] foams with a homogeneous interconnected porosity and an average cell size in the range of~1±100 lm, bulk density from 0.2±0.6 g cm ±3, and cell density from~10 7 ±10 12 cells cm ±3 . The starting materials were poly(methyl methacrylate) (PMMA) microbeads, acting as sacrificial template, and a COMMUNICATIONS

show abstract

“…Virtually any type of ceramic material can be deposited by EPD; therefore, it has been gaining increasing interest as a ceramic processing technique for providing technical materials such as water adsorption/desorption materials, 5) solid oxide fuel cells (SOFCs), 6) hydroxyapatite, 7) photocatalysts, 8) catalytic coatings, 9) carbon nanotubes, 10) solar cells, 11) bio-glass, 12) and separation membranes. 13), 14) Owing to the basic principles of electrophoresis, as indicated in Eq. (1), a solvent with a high relative dielectric constant is necessary for use in the EPD bath.…”

Section: ¹1mentioning

confidence: 99%

Ultra-low-electric power electrophoretic deposition by using non-flammable hydrofluoroether

Negishi

2014

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

A relative dielectric constant of a solvent is important for the electrophoretic deposition (EPD) suspension, and when the electrical resistance of the solvent is high, a large quantity of material is expected to be deposited. In this study, ethylperfluorobutylether (EFE), which is a kind of hydrofluoroether, was applied as the solvent for preparing a particle suspension for the EPD. EFE has the advantages of being polar, non-flammable, and having high electrical insulation properties. Silica powder was selected as the deposition material. When EFE is used, unlike when acetone-based EPD suspension was used, the amount deposited remains the same, but power consumption is 1/2,000 or less. Depending on conditions, power consumption is reducible even to 1/200,000. Thus, highly efficient EPD with ultra power saving ability was achieved. In addition, this process is extremely safe as EFE is nonflammable, removing the hazard of ignition. As the specific gravity of EFE is large, sedimentation of inorganic particles is slow; therefore, the dispersibility is excellent, and highly uniform coatings can be obtained. Unlike water-based EPD suspensions, the application of a high voltage is possible. In the present study, the deposition behavior was no different from that for conventional EPD, being controllable by varying the applied voltage, deposition time, and particle concentration.

show abstract

The preparation and analysis of zeolite ZSM-5 membranes on porous alumina supports

Cited by 33 publications

References 5 publications

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Zeolite Coatings on Microcellular Ceramic Foams: A Novel Route to Microreactor and Microseparator Devices

Ultra-low-electric power electrophoretic deposition by using non-flammable hydrofluoroether

Contact Info

Product

Resources

About