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Evolution of the Porous Structure and Surface Area of Palygorskite Under Vacuum Thermal Treatment

Published online by Cambridge University Press:  02 April 2024

J. M. Cases ,
Y. Grillet ,
M. François ,
L. Michot ,
F. Villiéras  and
J. Yvon
J. M. Cases
Affiliation:
Centre de Recherche sur la Valorisation des Minerais et U.A. 235- B.P. 40, 54501 Vandœuvre Cedex, France
Y. Grillet
Affiliation:
Centre de Thermochimie et de Microcalorimétrie - 26, rue du 141ème R.I.A., 13003 Marseille, France
M. François
Affiliation:
Centre de Recherche sur la Valorisation des Minerais et U.A. 235- B.P. 40, 54501 Vandœuvre Cedex, France
L. Michot
Affiliation:
Centre de Recherche sur la Valorisation des Minerais et U.A. 235- B.P. 40, 54501 Vandœuvre Cedex, France
F. Villiéras
Affiliation:
Centre de Recherche sur la Valorisation des Minerais et U.A. 235- B.P. 40, 54501 Vandœuvre Cedex, France
J. Yvon
Affiliation:
Centre de Recherche sur la Valorisation des Minerais et U.A. 235- B.P. 40, 54501 Vandœuvre Cedex, France
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Abstract

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The modification of the external surface area and the two types of microporosity of palygorskite (structural and interfiber porosity) were examined as a function of the temperature of a vacuum thermal treatment to 500°C. The methods used included: controlled-transformation-rate thermal analysis, N2 and Ar low-temperature adsorption microcalorimetry, conventional and continuous gas-adsorption volumetry (for N2 and Ar) at 77 K and CO2 at 273 and 293 K, water vapor adsorption gravimetry, and immersion microcalorimetry in water. At temperatures < 100°C only 18% of the structural microporosity was available to N2, 13% to Ar, and 100% to CO2 at 273 K. In both experiments the channels filled at very low relative pressures. At temperatures between 70° and 130°C the structure folded, and the mineral transformed to anhydrous palygorskite, which showed no structural microporosity. The interfiber microporosity was found to be independent of the temperature treatment, and the external surface area decreased slightly from 65 to 54 m2/g. The water adsorption isotherms showed that the folding of the structure was reversible up to final outgassing temperatures >225°C.

Keywords

AdsorptionMicrocalorimetryMicroporosityPalygorskiteSurface areaThermal treatment
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 2 , April 1991 , pp. 191 - 201
Copyright
Copyright © 1991, The Clay Minerals Society

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