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Comparative study of the active sites in zeolites by different probe molecules

Dondur Vera T. (Faculty of Physical Chemistry, Belgrade)
Rakić Vesna M. (Faculty of Agriculture, Belgrade-Zemun)
Damjanović Ljiljana S. (Faculty of Physical Chemistry, Belgrade)
Auroux Aline (Institut de Rechershes sur la Catalyse, Villeurbanne, France)

This review summarizes some of the recently published results concerning the acid sites in the zeolites ZSM-5 and Y studied by temperature-programmed desorption (TPD) and adsorption calorimetry using different probe molecules NH3, CO, N2O and n-hexane. For the first time it has been shown that the acid sites in hydrated zeolites are accessible for n-hexane adsorption.

Keywords: zeolites, temperature-programmed desorption, microcalorimetry, acidsites, ammonia adsorption, carbon monoxide adsorption, nitric oxide adsorption, n-hexane adsorption