Abstract
The aromatization of 3-methylhexane labelled on all possible positions has been studied in the temperature range 340–380 °C over a series of Pt–Al2O3 catalysts with a metal dispersion extending from 0.04 to 1. 13C labelling technique using mass spectrometry suggests that the major 1–6 ring-closure mechanism is accompanied by an additional mechanism involving a 1–5 dehydrocyclization as a preliminary step.Comparison between the relative contributions of the two mechanisms in the aromatization of various labelled 3-methylhexanes, the absence of temperature and hydrogen-pressure effects in addition to the absence of any appreciable particle-size effect indicate that the additional mechanism consists, in the adsorbed phase, of three consecutive steps: 1–5 ring closure, ring opening and 1–6 ring closure, without desorption. The absence of any particle-size effect suggests that 1–5 ring closure and 1–6 ring closure involve the same catalytic sites on the metal surface.
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More From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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