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Title: Adsorption of H{sub 2}S and SO{sub 2} and Bigadic clinoptilolite

Abstract

H{sub 2}S and SO{sub 2} adsorption isotherms of Bigadic clinoptilolite and its Na-, K-, Ca- and H-enriched forms were determined in the 0 to 100 kPa range at 25{degrees}C by using a constant volume adsorption system. Langmuir, Freundlich, Dubinin-Radushkevich (D-R), and Dubinin-Astakhov (D-A) models were applied to the isotherm data. Higher adsorption capacities and a larger increase in the amount adsorbed at higher pressures were observed for SO{sub 2}, in agreement with its higher permanent dipole moment, resulting in stronger ion-dipole and dipole-dipole interactions for this molecule. The Ca-form exhibited a molecular sieving behavior for both gases, originating from the channel blockage caused by the cation locations in the sample. The highest capacities for both gases were obtained with the sample in its H-form, followed by the Na- and K-forms for SO{sub 2}, parallel to the decrease in the electronegativity and ionic potential and the increase in the polarizability of the cation. In the case of H{sub 2}S, the H-form was followed by the K-form, but the Na-form yielded very low adsorption capacities. Initial dissociative adsorption of H{sub 2}S on certain Na sites to yield SH and OH species is thought to contribute to a more effective blocking of themore » channels, which were already partially blocked in this sample. Of the isotherm models tested, the D-A model explained the variations in the data better than either the Freundlich or D-R models. For the cation-gas combinations with a lower extent of channel blockage though, the Langmuir model was somewhat more representative. Lower E and n values were obtained from the D-A model for H{sub 2}S on the Na-form, which may be related to the lower extent of micropore adsorption and to the presence of blocked, almost dead-end shorter channel segments in the sample. Pore volumes close to the theoretical value were estimated from the D-A parameters for SO{sub 2} adsorption.« less

Authors:
; ;  [1]
  1. Istanubul Technical Univ. (Turkey)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
273510
Resource Type:
Journal Article
Journal Name:
Separation Science and Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 13; Other Information: PBD: Jul 1995
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; 03 NATURAL GAS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; CLINOPTILOLITE; SORPTIVE PROPERTIES; HYDROGEN SULFIDES; ADSORPTION; SULFUR DIOXIDE; ADSORPTION ISOTHERMS; ELECTRONEGATIVITY; POLARIZABILITY; ZEOLITES; FUEL GAS; AIR POLLUTION CONTROL; SEPARATION PROCESSES

Citation Formats

Sirkecioglu, A, Altav, Y, and Erdem-Senatalar, A. Adsorption of H{sub 2}S and SO{sub 2} and Bigadic clinoptilolite. United States: N. p., 1995. Web. doi:10.1080/01496399508013713.
Sirkecioglu, A, Altav, Y, & Erdem-Senatalar, A. Adsorption of H{sub 2}S and SO{sub 2} and Bigadic clinoptilolite. United States. https://doi.org/10.1080/01496399508013713
Sirkecioglu, A, Altav, Y, and Erdem-Senatalar, A. 1995. "Adsorption of H{sub 2}S and SO{sub 2} and Bigadic clinoptilolite". United States. https://doi.org/10.1080/01496399508013713.
@article{osti_273510,
title = {Adsorption of H{sub 2}S and SO{sub 2} and Bigadic clinoptilolite},
author = {Sirkecioglu, A and Altav, Y and Erdem-Senatalar, A},
abstractNote = {H{sub 2}S and SO{sub 2} adsorption isotherms of Bigadic clinoptilolite and its Na-, K-, Ca- and H-enriched forms were determined in the 0 to 100 kPa range at 25{degrees}C by using a constant volume adsorption system. Langmuir, Freundlich, Dubinin-Radushkevich (D-R), and Dubinin-Astakhov (D-A) models were applied to the isotherm data. Higher adsorption capacities and a larger increase in the amount adsorbed at higher pressures were observed for SO{sub 2}, in agreement with its higher permanent dipole moment, resulting in stronger ion-dipole and dipole-dipole interactions for this molecule. The Ca-form exhibited a molecular sieving behavior for both gases, originating from the channel blockage caused by the cation locations in the sample. The highest capacities for both gases were obtained with the sample in its H-form, followed by the Na- and K-forms for SO{sub 2}, parallel to the decrease in the electronegativity and ionic potential and the increase in the polarizability of the cation. In the case of H{sub 2}S, the H-form was followed by the K-form, but the Na-form yielded very low adsorption capacities. Initial dissociative adsorption of H{sub 2}S on certain Na sites to yield SH and OH species is thought to contribute to a more effective blocking of the channels, which were already partially blocked in this sample. Of the isotherm models tested, the D-A model explained the variations in the data better than either the Freundlich or D-R models. For the cation-gas combinations with a lower extent of channel blockage though, the Langmuir model was somewhat more representative. Lower E and n values were obtained from the D-A model for H{sub 2}S on the Na-form, which may be related to the lower extent of micropore adsorption and to the presence of blocked, almost dead-end shorter channel segments in the sample. Pore volumes close to the theoretical value were estimated from the D-A parameters for SO{sub 2} adsorption.},
doi = {10.1080/01496399508013713},
url = {https://www.osti.gov/biblio/273510}, journal = {Separation Science and Technology},
number = 13,
volume = 30,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 1995},
month = {Sat Jul 01 00:00:00 EDT 1995}
}