Preparation of zeolite beta membranes and their pervaporation performance in separating di- from mono-branched alkanes

Maloncy, Maikel Laurence; Berg, Annemieke W. C. van den; Góra, Leszek; Jansen, J.C.

doi:10.1016/j.micromeso.2005.05.034

Cited by 25 publications

(22 citation statements)

References 28 publications

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“…4c1 and d1). Both thickness and morphology of membrane MB_10 were in agreement with the results of Maloncy et al [12] using the same synthesis conditions on TiO 2 coated stainless steel disk supports.…”

Section: Resultssupporting

confidence: 89%

“…A comparable value was obtained by Maloncy et al for pervaporation of a binary mixture 2MP/22DMB at 303 K [12]. Also the values for the permeances of the different isomers are of the same order as reported by Maloncy et al [12] for BEA membranes of similar thickness. However, comparisons should be made with caution since in the present study a more complex quaternary system is considered.…”

Section: Resultssupporting

confidence: 86%

“…These authors suggest that the selective adsorption of linear and monobranched hexanes in zeolite Beta could be explained by the shape selective behaviour of the narrow channels which block the access of the bulkier dibranched hexanes. Recently, Maloncy et al [12] used two different methods to synthesize zeolite Beta (BEA) membranes by seeding and secondary growth technique on TiO 2 coated stainless steel disk supports. These membranes were afterwards used in pervaporation of equimolar mixtures of 2MP and 22DMB at 303 K showing selectivities of 1.5 in favour of the monobranched isomer.…”

Section: Introductionmentioning

confidence: 99%

“…BEA membranes were prepared by secondary growth method combining different seeding techniques, seeding materials and posterior hydrothermal synthesis conditions reported elsewhere [12,13,15,16]. These membranes were characterized and their potential for the separation of branched hexane isomers was studied.…”

Section: Introductionmentioning

confidence: 99%

“…The same pressure gradient technique was applied in the seeding method 2 using a colloidal suspension of Na-BEA prepared as described elsewhere [12]. Dip-coating was used in method 3 to fix nanocrystalline zeolite Beta on the internal surface of the supports [16].…”

mentioning

confidence: 99%

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Zeolite Beta membranes for the separation of hexane isomers

Bárcia

Ferreira

Gascón

et al. 2010

Microporous and Mesoporous Materials

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a b s t r a c tThe preparation of a-alumina supported zeolite Beta membranes was successfully achieved and sped up by exploring combinations of three seeding techniques and three synthetic methods. The surface of the membranes was completely covered by well intergrown crystals; the thickness of the zeolite layers ranged from 2 to 6 lm depending on the synthesis method used. The quality of the membranes was tested by means of pervaporation of ethanol/1,3,5-triisopropylbenzene (TIPB) mixtures together with permporometry experiments. The performance in the vapour separation of quaternary equimolar mixtures of nhexane (nHEX), 3-methylpentane (3MP), 2,3-dimethylbutane (23DMB) and 2,2-dimethylbutane (22DMB) in the range 343-443 K showed that permeate flux decreases as the branching degree increases following the order: nHEX ) 3MP > 23DMB > 22DMB. In the retentate, the fractions of monobranched and normal hexane decrease while the concentration of dibranched isomers is increased compared to the feed composition. The influence of the temperature in the permeation fluxes indicates the existence of an activated transport mechanism which favours the permeation of more nHEX and 3MP with regard to their dibranched isomers. The octane number (ON) of the quaternary mixture was enhanced up to 5 points with the best synthesized membrane.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Zeolite Beta membranes for the separation of hexane isomers

Bárcia

Ferreira

Gascón

et al. 2010

Microporous and Mesoporous Materials

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Zeolite Membranes in Catalysis: What Is New and How Bright Is the Future?

Bergh

Nishiyama

Kapteijn

2010

Novel Concepts in Catalysis and Chemical Reactors

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Preparation and permeation characterization of β‐zeolite‐incorporated composite membranes

Huang

et al. 2008

J of Applied Polymer Sci

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In this work, several b-zeolite-incorporated polymer composite membranes were fabricated with the solution-casting method. The zeolite loadings were 10, 20, and 30 wt %, respectively. Scanning electron microscopy characterization showed that the zeolite particles could be uniformly distributed in the whole polymer matrix. Gas permeation results demonstrated that after the incorporation of the same b-zeolite, the polyimide exhibited a significant increase in gas permeability but a decrease in permselectivity, and both were quite pronounced at high zeolite loadings; this resulted from the loose structure that formed. The poly(ether sulfone) composite membranes showed obvious increases in both permeability and selectivity, and the permeability increase was considerably greater at higher zeolite loadings. The permselectivity increase could possibly be attributed to the pore sieving and preferential adsorption of b-zeolite entities for the test gases as the heat treatment may have resulted in the formation of a defect-free microstructure. However, breakthrough of the upper-bound line was not achieved for these composite membranes, as reflected by Robeson plots. Our results suggest that changes in membrane performance not only are attributable to the properties and content of b-zeolite particles but also depend on the heterogeneous microstructure created by zeolite entities.

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Preparation of zeolite beta membranes and their pervaporation performance in separating di- from mono-branched alkanes

Cited by 25 publications

References 28 publications

Zeolite Beta membranes for the separation of hexane isomers

Zeolite Beta membranes for the separation of hexane isomers

Zeolite Membranes in Catalysis: What Is New and How Bright Is the Future?

Preparation and permeation characterization of β‐zeolite‐incorporated composite membranes

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