Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clay Minerals Signup for GSW Email News
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clay Minerals; December 1999; v. 34; no. 4; p. 647-655
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Balci, S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Effect of heating and acid pre-treatment on pore size distribution of sepiolite

S. Balci

Gazi University, Department of Chemical Engineering, Ankara, Turkey

Due to its channels of molecular dimensions and a high specific surface area, sepiolite has many industrial applications which require high resistance to thermal effects in addition to a large surface area. On heating, sorbed water molecules are removed causing changes in the pore size distribution. In this study, the effects of thermal treatment on the pore structure of sepiolite and the acid-treated sepiolite samples were investigated. The solid density of sepiolite, measured by a He displacement technique, was 2.08 g cm (super -3) and total porosity was approximately 0.58. Both of these values showed an increase at 100 degrees C, then decreased with further temperature increase due to crystal deformation and channel plugging which occurred at elevated temperatures. The BET surface area of the original sepiolite was 148 m 2 g (super -1) , and increased to 263 m 2 g (super -1) at 100 degrees C and then started to decrease. Approximately 16% of the total volume was in the micropores at 100 degrees C. The acid pre-activation caused restrictions in possible crystal deformation during thermal treatment. The micropore volume increased to 20% and BET surface area reached values >500 m 2 g (super -1) for the acid-treated samples.

This record provided courtesy of AGI/GeoRef.




This article has been cited by other articles:


Home page
 Clays and Clay MineralsHome page
G. Jozefaciuk and D. Matyka-Sarzynska
EFFECT OF ACID TREATMENT AND ALKALI TREATMENT ON NANOPORE PROPERTIES OF SELECTED MINERALS
Clays and Clay Minerals, April 1, 2006; 54(2): 220 - 229.
[Abstract] [Full Text] [PDF]

Home page
 Clay MineralsHome page
A. Yebra-Rodriguez, A. YEBRA-RODRIGUEZ, J. D. MARTIN-RAMOS, F. del REY, C. VISERAS, and A. LOPEZ-GALINDO
Effect of acid treatment on the structure of sepiolite
Clay Minerals, September 1, 2003; 38(3): 353 - 360.
[Abstract] [Full Text] [PDF]

Home page
 Clays and Clay MineralsHome page
G. Jozefaciuk, G. Jozefaciuk, and G. Bowanko
EFFECT OF ACID AND ALKALI TREATMENTS ON SURFACE AREAS AND ADSORPTION ENERGIES OF SELECTED MINERALS
Clays and Clay Minerals, December 1, 2002; 50(6): 771 - 783.
[Abstract] [Full Text] [PDF]

Home page
 Clays and Clay MineralsHome page
K. Okada, K. Okada, N. Nakazawa, Y. Kameshima, A. Yasumori, J. Temuujin, K. J. D. Mackenzie, and M. E. Smith
PREPARATION AND POROUS PROPERTIES OF MATERIALS PREPARED BY SELECTIVE LEACHING OF PHLOGOPITE
Clays and Clay Minerals, October 1, 2002; 50(5): 624 - 632.
[Abstract] [Full Text] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Mineralogical Society of Great Britain and Ireland