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Abstract
The mechanism of the isomerization reaction of 2-methylpentane on highly dispersed Pt Al 2O 3 modified by the addition of Te or Sb has been investigated. The relative contributions of C 5-cyclic and bond shift mechanisms were determined by the use of 2-methylpentane (2- 13C) and 2-methylpentane (5- 13C) along with 13C NMR analysis. n-Hexane was formed primarily by a C 5-cyclic mechanism while 3-methylpentane was produced by both cyclic and bond shift mechanisms. Isomerization via bond shift increases when Te or Sb is added to Pt Al 2O 3 . The results can be best described if the Rooney-Samman isomerization mechanism, which includes a transient cyclopropyl species as an intermediate in the methyl shift process, is favored upon Pt modification by Te or Sb.
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