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ŠTÚDIUM POVRCHOVÝCH VLASTNOSTÍ SLOVENSKÉHO PRÍRODNÉHO ZEOLITU –KLINOPTILOLITU FYZIKÁLNOU ADSORPCIOU DUSÍKA

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Author(s): Mária Főldesová | Pavol Hudec

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 49;
Issue: 1;
Start page: 34;
Date: 2007;
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Keywords: clinoptilolite | chemically modified clinoptilolite | structure of zeolite surface | physical adsorption of nitrogen | BET isotherm | t-plot method | pore size distribution

ABSTRACT
The influence of NaOH solutions (concentrations 2 or 4 mol/L) on the surface characteristics of clinoptilolite was determined by physical adsorption of nitrogen at the temperature of liquid nitrogen by volumetric method. Specific surface of zeolites was determined by standard BET isotherm. Specific volume of micropores and specific surface of mesopores together with external surface were assessed using t-plot. Pore size distribution was determined by standard BJH treatment of desorption isotherm. Total pore volume was calculated from volume of adsorbed nitrogen at relative pressure 0.98. The experiments show the double increase of specific surface in dependence of the concentration of modified solution along with increasing of diameter of mesopores and total volume of pores. These results confirm the formation of secondary mesopore structure after modification with NaOH solution.
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