Effect of pretreatment in benzene hydrogenation on Pt/nylon catalyst

Benzene hydrogenation on Pt/nylon catalyst produced cyclohexene and cyclohexane, in contrast to PtiSiO, on uhich only cyclohexane was detected. Higher selectivity to cyclohexene was found at higher temperature and after air pretreatment. It is suggested that an oxidized platinum species is responsible for cycrohexene formation.