Silylation of micro-, meso- and non-porous oxides: a review

Impens, Nathalie; Voort, Pascal Van Der; Vansant, Etienne F.

doi:10.1016/s1387-1811(98)00239-x

Cited by 172 publications

(116 citation statements)

References 31 publications

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“…Experimental results showed that Iranian natural zeolite is potentially a sorbent for xylene in the examined range of ppm concentration, especially at lower flow rates. This study showed good agreement with other studies (22)(23)(24). To optimize the conditions of the adsorption process, fur-ther studies should be performed for other gases in VOC groups.…”

Section: The Effect Of Particle Size and Zeolite Weightsupporting

confidence: 93%

Adsorption of Xylene From Air by Natural Iranian Zeolite

2014

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Background: Aromatic organic solvents are extensively used in various industries. Xylene is a colorless, transparent liquid, with the characteristic odor of the aromatic hydrocarbons family, which is widely used in industries. Adsorption is a conventional method of purifying polluted air containing volatile organic compounds (VOCs). Zeolite has many unique properties such as high capacity, molecular sieve characteristics, nonflammability, thermal stability, and strong acid sites. Moreover, it is reconstructed at low temperatures. Objectives: In this study, we investigated the effect of various parameters on the adsorption capacity of natural zeolite (clinoptilolite) for xylene adsorption. Materials and Methods: Physical and chemical properties of natural zeolites were tested by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) and elemental analyses of natural zeolites were characterized by X-ray diffraction. Xylene concentration was measured at various times through concentrations-measured valve before and after the adsorbent bed reactor by the direct reading of Phocheck (Ion Science Ltd, UK). Results: Experimental results showed that clinoptilolite is a potential sorbent for xylene in the range of ppm, and the breakthrough time would be reduced by increasing the concentration. The optimal temperature of xylene adsorption on natural zeolite was 35℃ and by increasing the temperature, the absorption efficiency of clinoptilolite was declined. The results showed that the breakthrough time and the exhaustion point time at the optimal conditions are 65 and 95 minutes, respectively. Adsorption capacity of clinoptilolite was obtained as 1.69 mg xylene/g zeolite. Conclusions: Experimental results showed that clinoptilolite is a potential sorbent for xylene in the range of ppm and the breakthrough time was reduced by increasing the concentration. Adsorption rate were increased by increasing concentration of xylene. Presence of xylene molecules in high concentration enhances their transfer and contact with adsorbent; as a result, by increasing gas concentration, breakthrough time in zeolite will be shorter.

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Section: The Effect Of Particle Size and Zeolite Weightsupporting

confidence: 93%

Adsorption of Xylene From Air by Natural Iranian Zeolite

2014

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“…In selected systems, catalyst activity can be enhanced by hydrophobisation of the surface [22,23]. Few studies, however, exist on preservation of the structure [24,25], especially for alumina. Nevertheless, structural preservation is an important additional requirement if separation applications are considered, which is even more so the case for materials with small mesopores.…”

Section: Introductionmentioning

confidence: 99%

“…In order to enhance understanding of the observed effects, we now study the structural changes and on the structure. Easily applicable liquid phase silination with the addition of a nucleophile (water) was chosen for its high reactivity at low temperatures [24].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobisation of mesoporous γ-Al2O3 with organochlorosilanes—efficiency and structure

Castricum

Sah

Mittelmeijer‐Hazeleger

et al. 2005

Microporous and Mesoporous Materials

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Hydrophobisation of mesoporous -Al2O3 with organochlorosilanes-efficiency and structure Castricum, H.L.; Sah, A.; Mittelmeijer-Hazeleger, M.C.; ten Elshof, J.E. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.

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“…[1][2][3][4] Silane grafting on the surface of lamellar mesostructured silica is of special interest since this modification makes the surface organophilic and enhances its compatibility with organic solvents or polymers for dispersion or catalytic purposes, as well as its stability with respect to atmospheric humidity. 5,6 The usual silylating procedures and characterization techniques of silylated porous substrates are not suitable for lamellar mesostructured silica.…”

Section: Introductionmentioning

confidence: 99%