PROPERTIES OF ALKALI-METAL ION-EXCHANGE OF H BETA-ZEOLITE - ADSORPTION OF BENZENE ON THE ACIDIC AND BASIC SITES OF KH BETA-ZEOLITE STUDIED BY IN-SITU IR-SPECTROSCOPY

In situ IR studies of benzene adsorbed on several KH beta zeolites, wh ere the extent of potassium exchange, K/Al (%), varied from 0 to 88.32 %, have been undertaken under different conditions. The bands of adsor bed benzene on KH beta zeolites in the range 2050-1700 cm-1 were assig ned. KH beta zeolite exhibits basicity only when K/Al less-than-or-equ al-to 88.32%, where its basicity is stronger and its acidity weaker. T he order of stability of the various adsorbed benzene species on the s amples is as follows: O-(benzene) > H+(benzene) > K+(benzene) > benzen e.