SORPTION PROPERTIES OF SILICALITE-1 OF PURE SILICA FORM - THE INFLUENCE OF SORPTION HISTORY ON SORPTION KINETICS OF CRITICALLY SIZED MOLECULES

Date

1992-07-01

Author

KARSH, H
Çulfaz, Ali
YUCEL, H

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

279
views

0
downloads

Sorption properties of silicalite-1 samples of pure silica form for some parafinic and aromatic hydrocarbons of different molecular sizes were investigated. It was observed that sorption rates and apparent equilibrium capacities for critically sized molecules, m-xylene and o-xylene, depend on the sorption history of the sample. Sorption of m- and o-xylene proceeded extremely slowly on fresh samples of silicalite-1, whereas sorption rates of these molecules on silicalite-1 samples that had passed through a previous p-xylene sorption/regeneration step were significantly faster and equilibrium capacities reached about 92-95% of sorption volume of silicalite-1 when sufficient time was allowed. Uptake curves for m- and o-xylene were of the sigmoid-type, indicative of lattice distortions of silicalite framework. The results of this work, along with some recent, independent studies involving n.m.r. MAS and XRD methods strongly suggest that sorption of some critically sized molecules causes subtle lattice distortions of high-silica ZSM-5 zeolites, modifying their sorptive behavior.

Subject Keywords

General Environmental Science

URI

https://hdl.handle.net/11511/57588

Journal

ZEOLITES

DOI

https://doi.org/10.1016/0144-2449(92)90124-8

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Anaerobic Digestability and Biogas Production Capacity of Pistachio Processing Wastewater in UASB Reactors Gur, E.; Demirer, Göksel Niyazi (American Society of Civil Engineers (ASCE), 2019-08-01) High volumes of wastewater with considerable levels of organic and phenolic compounds and solid material are produced during pistachio processing. There is not a commonly adopted treatment technology for the wastes produced during pistachio processing. The objective of this study is to evaluate the anaerobic digestability and biogas production capacity of pistachio processing wastewater in upflow anaerobic sludge blanket (UASB) reactors for the first time in the literature. The results indicated that pistac...
Time Weighted Average Concentration Monitoring Based on Thin Film Solid Phase Microextraction Ahmadi, Fardin; Sparham, Chris; Boyacı, Ezel; Pawliszyn, Janusz (American Chemical Society (ACS), 2017-04-04) Time weighted average (TWA) passive sampling with thin film solid: phase micro extraction (TF-SPME) and liquid chromatography tandem mass spectrometry (LC-MS/MS) was used for collection, identification, and quantification of benzophenone-1, benzophenone-2, benzophenone-3, benzophenone-4, 2-phenylbenzimidazole-5-sulfonic acid, octocrylene, octylmethoxycinnamate, butylmethoxydibenzgylmethane, triclocarban and triclosan in the aquatic environment. Two types of TF-SPME passive samplers, including a retracted th...
Nanoceria supported palladium(0) nanoparticles: Superb catalyst in dehydrogenation of formic acid at room temperature Akbayrak, Serdar; TONBUL, YALÇIN; Özkar, Saim (Elsevier BV, 2017-06-05) Highly efficient dehydrogenation of formic acid (FA) at room temperature was achieved using palladium(0) nanoparticles supported on nanoceria (Pd-0/CeO2) as catalysts. Pd-0/CeO2 was prepared by impregnation of palladium(II) ions on the surface of ceria followed by their reduction with sodium borohydride in aqueous solution at room temperature. Pd((0)/CeO2 was isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniques. The catalytic activity of ...
Nanoceria-Supported Ruthenium(0) Nanoparticles: Highly Active and Stable Catalysts for Hydrogen Evolution from Water Demir Arabacı, Elif; Önal, Ahmet Muhtar (American Chemical Society (ACS), 2018-02-21) Ruthenium(0) nanoparticles supported on nanoceria (Ru-0/CeO2) were prepared by reduction of Ru3+ ions on the surface of ceria using aqueous solution of NaBH4. The Ru-0/CeO2 samples were characterized by advanced analytical tools and employed as electrocatalysts on the glassy carbon electrode (GCE) in hydrogen evolution from water. The GCE, modified by Ru-0/CeO2 (1.86 wt % Ru), provides an incredible electrocatalytic activity with a high exchange current density of 0.67 mA.cm(-2), low overpotential of 47 mV ...
Biodegradation of 4-chlorophenol by acclimated and unacclimated activated sludge - Evaluation of biokinetic coefficients ŞAHİNKAYA, ERKAN; Dilek, Filiz Bengü (Elsevier BV, 2005-10-01) Unacclimated and acclimated activated sludges were examined for their ability to degrade 4-CP (4-chlorophenol) in the presence and absence of a readily growing substrate using aerobic batch reactors. The effects of 4-CP on the p (specific growth rate), COD removal efficiency, Y (yield coefficient), and q (specific substrate utilization rate) were investigated. It was observed that the toxicity of 4-CP on the culture decreased remarkably after acclimation. For example, the IC50 value on the basis of It was f...

Citation Formats

H. KARSH, A. Çulfaz, and H. YUCEL, “SORPTION PROPERTIES OF SILICALITE-1 OF PURE SILICA FORM - THE INFLUENCE OF SORPTION HISTORY ON SORPTION KINETICS OF CRITICALLY SIZED MOLECULES,” ZEOLITES, pp. 728–732, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57588.