Low-temperature ozone treatment for organic template removal from zeolite membrane

Heng, S.; Lau, P.P. Sze; Yeung, King Lun; Djafer, M.; Schrotter, Jean‐Christophe

doi:10.1016/j.memsci.2004.05.025

Cited by 100 publications

(44 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hence, in order to achieve high hydrophilic properties of silicalite-1 by remaining silanol groups, low 5 temperature oxidation technique was required. The ozonation method at low temperature of 473 K reported by Heng et al [16] is an effective method to remove the template without dehydration between silanol groups. In this study, in order to achieve high hydrophilic properties of the membrane with the remaining silanol group, the liquid-phase oxidation technique using hydrogen-peroxide solution at the reflux condition was applied [12] to remove the template.…”

mentioning

confidence: 99%

Preparation of hydrophilic silicalite-1 nanocrystal-layered membranes and their application to separating water from water–acetone solution

Tago

Nakasaka

Kayoda

et al. 2008

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

Separation of water from a water-acetone solution was carried out by a pervaporation method using a hydrophilic slilcalite-1 membrane. Silicalite-1 nanocrystals were piled up on the outer surface of cylindrical alumina ceramic filters, followed by a hydrothermal synthesis to form a silicalite-1 protection 5 layer on the nanocrystal layer. In other words, the membrane consisted of a silicalite-1 nanocrystal layer and a silicalite-1 protection layer (the nanocrystal-layered membrane). In order to achieve high hydrophilic properties of the membrane with the remaining silanol group, the liquid-phase oxidation technique was applied to remove the template. From the SEM observation, the nanocrystal layer and the protection layer were clearly observed, and the silicalite-1 protection layer was uniformly formed on the 10 nanocrystal-layer. Pervaporation experiments to separate water from the water-acetone solution were conducted using the nanocrystal-layered membrane. It was considered that the secondary growth of the nanocrystals around the interface between the nanocrystal and protection layers affected the separation properties. The effects of the nanocrystal size on the separation properties were examined. The membrane exhibited selective permeation as well as a high flux of water, and these properties were improved with a 15 decrease in the size of the nanocrystals. Moreover, the layered membrane exhibited high hydrophilic properties regardless of the acetone concentrations.

show abstract

mentioning

confidence: 99%

Preparation of hydrophilic silicalite-1 nanocrystal-layered membranes and their application to separating water from water–acetone solution

Tago

Nakasaka

Kayoda

et al. 2008

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

show abstract

“…Zeolite growth, microstructure and morphology are sensitive to synthesis parameters particularly temperature and time [36,37,40,41]. Scanning electron micrographs of two core-shell catalysts are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Preparation of core (Ni base)–shell (Silicalite-1) catalysts and their application for alkali resistance in direct internal reforming molten carbonate fuel cell

Zhang

et al. 2012

Journal of Power Sources

Self Cite

View full text Add to dashboard Cite

“…organic molecules from the zeolite pores. The etched samples were treated with ozone at 523 K [32] until a steady-state nitrogen gas permeance is obtained. ZSM-5 micromembranes were converted to HZSM-5 micromembranes via ion-exchange in 0.5 M NH 4 NO 3 and calcination.…”

Section: Preparation Of Supported and Self-supportingmentioning

confidence: 99%

“…We had reported on the synthesis and preparation of supported and self-supporting zeolite membranes in our recent works [27][28][29][30][31][32][33][34][35][36][37][38][39] and had successfully assembled a microfabricated HZSM-5 zeolite micromembrane unit into operational micro fuel cells (i.e., H 2 l-PEMFC [40] and l-DMFC [41]). This work investigates the properties and performance of supported and self-supporting zeolite membranes for H 2 PEMFC operation.…”

Section: Introductionmentioning

confidence: 99%

Zeolite Proton Conducting Membrane for Micro Fuel Cell Applications

2010

Self Cite

View full text Add to dashboard Cite

Supported and self-supporting ZSM-5 membranes (Si/Al = 25) were prepared, assembled and tested for hydrogen fuel cell performance. A Grotthus-like mechanism is proposed for the proton conduction in hydrated zeolites, where the protons hop between neighbouring aluminium sites along a water bridge in the zeolite pores. The supported ZSM-5 membrane was prepared by seeding and secondary regrowth method on cellulose paper, whereas the self-supporting zeolite membrane consists of an array of micromembranes on silicon substrate. The self-supporting HZSM-5 membrane had an open-circuit voltage (OCV) of 0.77 V compared to 0.90 V for supported HZSM-5 and 0.98 V for Nafion 117. The differences are attributed to the contact between the electrode, catalyst and membrane layers in the assembly. The selfsupporting HZSM-5 yielded a maximum power density (MPD) of 19.4 mW cm -2 compared to 14.4 mW cm -2 for supported HZSM-5 and 35 mW cm -2 for Nafion 117.

show abstract

Low-temperature ozone treatment for organic template removal from zeolite membrane

Cited by 100 publications

References 36 publications

Preparation of hydrophilic silicalite-1 nanocrystal-layered membranes and their application to separating water from water–acetone solution

Preparation of hydrophilic silicalite-1 nanocrystal-layered membranes and their application to separating water from water–acetone solution

Preparation of core (Ni base)–shell (Silicalite-1) catalysts and their application for alkali resistance in direct internal reforming molten carbonate fuel cell

Zeolite Proton Conducting Membrane for Micro Fuel Cell Applications

Contact Info

Product

Resources

About