Abstract
Positron lifetimes and intensities were determined for simulated hydrogenation reaction mixtures consisting of 1/2, 1/1, and 2/1 ethanol–pentene molar ratios to which 0.25 mg platinum powder were added. Annihilation parameters were determined upon addition of each successive component, yielding long lifetimes (τ3) of 4.1±0.1 and 4.2±0.1 ns for 1-pentene and trans-2-pentene (99% trans), respectively. Large I2 increases were observed for cis-2-pentene and for 1/2 ethanol–cis-2-pentene, both containing platinum.
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