Temperature programmed desorption of argon for evaluation of surface acidity of solid superacids

Abstract
The activation energy of Ar desorption from solid acids is determined by temperature programmed desorption (TPD) using Ar as 9.3, 7.6 and 6.0–6.7 kJ mol−1 for sulfated ZrO2, Cs2.5H0.5PW12O40 and zeolites, respectively; the data indicate that Ar TPD is applicable to evaluation of the relative acid strengths of solid superacids.

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