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

Abstract

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