Calorimetric Measurement of the Heat of Adsorption of Benzene on Pt(111)†

Abstract

The heat of adsorption of benzene on clean Pt(111) at 300 K is measured calorimetrically and found to decrease with coverage (θ) as (197 48θ 83θ2) kJ/mol. Saturation coverage (θ ) 1.0) is 2.3 × 1014 molecules/cm2. Sticking probabilities of benzene on Pt(111) were measured by mass spectrometry, giving an initial value of 0.97 and showing Kisliuk-type behavior with increasing coverage that implies there is a precursor to sticking with a ratio of its hopping rate to its desorption rate of ∼28. Benzene adsorbs transiently on the benzene-saturated surface at 300 K with a trapping probability of 0.90 and a heat of adsorption of 63-73 kJ/mol.

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Cite this paper

@inproceedings{IhmCalorimetricMO, title={Calorimetric Measurement of the Heat of Adsorption of Benzene on Pt(111)†}, author={Hyeran Ihm and Henry M. Ajo and Charles T Campbell} }