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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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Matsuhashi et al. (2000) studied this question.
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