Abstract
Benzene and cyclohexane adsorption on Pt-Al 2O 3 samples of optimum platinum contents was investigated, and benzene π-complex formation on the surface was directly observed when these hydrocarbons were in contact with the catalyst. The surface π-complex formed after adsorption on Pt-Al 2O 3 sample had a considerable thermal stability, but reacted readily with hydrogen, and was removed by carbon monoxide subsequently adsorbed on the same sample. The direction of the change of the CO stretching frequency of the carbon monoxide adsorbed in its linear form served as an indicator of the type of the bonds formed when some other co-adsorbate was present on the same sample. For example, the difference between π- and σ-bonded coadsorbants could be registered in this way.
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