The Correlaton Between Adsorption
THE CORRELATON BETWEEN ADSORPTION
AND POROSITY PROPERTIES OF ALUMINA SAMPLES
OBTAINED FROM CLASSICAL ADSORPTION
AND THERMAL ANALYSIS METHODS
M. Planda, P. Staszczuk, J. Pekalska
Department of Physicochemistry of Solid Surface,
Chemistry Faculty, Maria Curie-Sklodowska University M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
Aluminas were commercially introduced in 1932 by Alcoa for water adsorption [1]. Nowadays, their applications in the adsorption [2] and catalysis [3] industries become almost endless. The influence of porosity upon the sorption abilities of a vapour is an interesting problem, we have chance to examine the process ofadsorption and the structure of adsorbents and catalysts.
There are presented the results of studies carried out to determine adsorption characteristics of three commercial alumina samples, obtained from Aluminum Company of America marked asAl-19, Al-30, Al-39.
Measurements of programmed thermodesorption of polar and nonpolar liquids from thesurface ofstudied alumina samples, under the quasi-static (quasi-isothermal, quasi-isobaric) conditions, were made bymeans ofthederivatograph Q-1500 D (MOM, Hungary). In this technique, the type of aspecially shaped sample crucible was used. The derivatograph Q-1500 D was connected with the computer via the interface equipped with a suitable program Derivat (Medson, Poland) toregister the sample mass loss curves asafunction of temperature and/or time and to determine thedifferential Q-DTG curves with respect totemperature and/or time [4].
The isotherms of adsorption of the water vapour were measured gravimetrically intheapparatus witha McBain microbalance.
The specific surface areas and porosity of studied samples were calculated from the low-temperature nitrogen adsorption isotherms measured using a sorptomat apparatus type ASAP 2405 V1.01 (Micrometrics Inc., USA).
The correlation between the porosity parameters obtained from sorptomatic measurements andparameters obtained from gravimetric
measurements andtheamount ofthe desorbed liquids vapours measured by thermal analysis technique was denoted.
References
1. I.B. Batnitt, U. S. Patent 1, 868, (1932).
2. K.P. Goodboy, H. L. Fleming, Chem. Eng. Prog., 80, 63, (1984).
3. R.Sh. Mkhail, et. al., Surf. Technol., 11, 279, (1980).
4. P.Staszczuk, J. Thermal. Anal., 53, 597, (1998).
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