Abstract
Differential thermal analysis is used as an acidity strength probe for a series of mordenite (zeolite) catalysts via determining the temperature at which presorbed pyridine completely desorbs from the catalyst. The findings obtained for metal(s) containing mordenite catalysts have been correlated with the Pearson's assumption concerning Lewis acids and bases and the Pauling's electronegativity of the metals contained and found compatible.
The investigated catalysts can be arranged in their observed order of acidity strength as follows: HTI > Th-HM > Re-HM > Pt-HM > Pt-Th-HM > Pt-Re-HM.