Abstract
This paper presents the first evaluation of the pore-size distribution and energy distribution of butanol on a silica gel surface on the basis of one experimental run. The Q-TG mass loss and the first derivative Q-DTG mass loss curves of n-butanol thermodesorption from a silica gel sample were made with a Derivatograph Q-1500 D (MOM, Hungary), using an analyser equipped with an automatic ultraslow procedure and a special crucible capable of maintaining the quasi-isothermal heating procedure to increase the resolution of thermal analysis. A numerical procedure was developed for evaluation of the mesopore-size distribution and energy distribution functions of liquids preadsorbed on the mesoporous surfaces from special thermal analysis techniques. This is based on a condensation approximation to treat the kinetics of liquid thermodesorption from solids. A preliminary example is presented of application of the above approach to a quantitative description of the structural and energetic heterogeneities of silica gel surfaces on the basis of a single Q-DTG curve of n-butanol thermodesorption under quasi-isothermal conditions.
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Bogillo, V.I., Staszczuk, P. Characterization of the Structural and Energetic Heterogeneity of Mesoporous Solid Surfaces from Q-DTG Data. Journal of Thermal Analysis and Calorimetry 55, 493–510 (1999). https://doi.org/10.1023/A:1010145919510
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DOI: https://doi.org/10.1023/A:1010145919510