Hydrovapothermal conversion of tetraethoxysilane vapor to polycrystalline zeolite layer by in situ gelationElectronic supplementary information (ESI) available: SEM images and seeding method. See http://www.rsc.org/suppdata/cc/b4/b400207p/

Mitra, Arindam; Ichikawa, Shinichi; Kikuchi, Eiichi; Matsukata, Masahiko

doi:10.1039/b400207p

Cited by 6 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the XRD patterns of the membranes, diffraction lines from the porous alumina tube were observed. In general, diffraction lines of zeolites in these XRD patterns have been considered to be the surface layerderived, [4][5][6] although the θ-2θ scan XRD gave only average information of the membrane overall due to the lack of depth resolution. Also, the conventional XRD can not show a clear difference even for the two samples having the different surface morphologies as shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…have not been sufficiently considered. 1,[3][4][5][6] To discuss zeolite crystal growth mechanism around (both inside and outside) the porous support during hydrothermal synthesis and water permeation behavior in the membrane during pervaporation (PV) or vapor permeation (VP) dehydration processes, one needs to estimate the fine structure of the tubular membrane fractionally for surface layer and for materials inside the porous support. However, such researches using XRD have not been reported.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Grazing Incidence X-ray Diffraction Analysis of Zeolite NaA Membranes on Porous Alumina Tubes

Kyotani

2006

ANAL. SCI.

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Grazing Incidence X-ray Diffraction Analysis of Zeolite NaA Membranes on Porous Alumina Tubes

Kyotani

2006

ANAL. SCI.

View full text Add to dashboard Cite

Stainless‐Steel‐Net‐Supported Zeolite NaA Membrane with High Permeance and High Permselectivity of Oxygen over Nitrogen

et al. 2005

View full text Add to dashboard Cite

After oxidation, the solution was centrifuged, decanted, and filtered through a 0.2 lm filter to remove silver particles, and freeze-dried for storage. Polyvinylferrocene homopolymer and ferrocene were oxidized in the same manner.Crosslinking: The freeze-dried FTI copolymer was molded mechanically into disks with diameter = 7 mm and thickness = 1 mm. Electron-beam crosslinking of the polymer was performed using an electron-beam source at Tyco Electronics in Menlo Park, CA. The samples were irradiated by a 3 MeV beam source using a series of approximately 0.9 s exposures for a total exposure time of 19.8 s.Transmission Electron Microscopy: Thin sections (ca. 50 nm) of crosslinked FTI were cryomicrotomed at ±100 C and examined by transmission electron microscopy at the National Center for Electron Microscopy at Lawrence Berkeley National Laboratory (LBNL). Staining was not required, since the electron contrast between the iron-containing block and the organic block was sufficient to differentiate the microphases of the polymer.Activity Measurements: Equimolar mixtures of reactants (0.29 mL MVK and 0.50 mL E2OC) were added to 2 mL of solvent (6:1 by volume dichloromethane:methanol mixture). Predetermined amounts of catalysts were added at time zero (t = 0) to the reaction mixture. The swollen crosslinked FTI catalyst was added as cubes approximately 1 mm in length. The Michael addition reaction was carried out in a glass reaction vessel at room temperature in an argon atmosphere. Samples were pipetted out of the glass reactor at regular intervals and analyzed by 1 H NMR. The progress of the reaction was followed by the time dependence of the vinyl proton NMR signal at 6.3 ppm, which is proportional to the concentration of the MVK. The samples obtained from the homogeneous catalysts were filtered through alumina columns to remove the dissolved iron species that interfere with the NMR experiments. In the case of the crosslinked FTI catalyst, no iron removal was needed prior to the NMR analysis. Since 10 % of the ferrocene in FTI remained after oxidation of the ferrocene to ferrocenium, and a small amount of silver may have been trapped in the block copolymer after filtration, experiments were carried out to determine whether ferrocene or silver are catalytically active. Neither of these components was found to be active for Michael addition under the conditions used for this work.

show abstract

Separation of triethoxysilane from tetraethoxysilane by batch distillation in a packed column

Lee

Jeong

Park

et al. 2016

Korean J. Chem. Eng.

View full text Add to dashboard Cite

Hydrovapothermal conversion of tetraethoxysilane vapor to polycrystalline zeolite layer by in situ gelationElectronic supplementary information (ESI) available: SEM images and seeding method. See http://www.rsc.org/suppdata/cc/b4/b400207p/

Abstract: Zeolite membrane has been fabricated on porous alumina substrate in a single continuous process of gelation and subsequent crystallization while suppressing nucleation of zeolite powder in the bulk.

Cited by 6 publications

References 15 publications

Grazing Incidence X-ray Diffraction Analysis of Zeolite NaA Membranes on Porous Alumina Tubes

Grazing Incidence X-ray Diffraction Analysis of Zeolite NaA Membranes on Porous Alumina Tubes

Stainless‐Steel‐Net‐Supported Zeolite NaA Membrane with High Permeance and High Permselectivity of Oxygen over Nitrogen

Separation of triethoxysilane from tetraethoxysilane by batch distillation in a packed column

Contact Info

Product

Resources

About