Ring enlargement and aromatization of propylcyclobutane over silica-supported Pt, Pd and Rh in hydrogen atmosphere

Török, Béla and Pálinkó, István and Molnár, Árpád and Bartók, Mihály (1994) Ring enlargement and aromatization of propylcyclobutane over silica-supported Pt, Pd and Rh in hydrogen atmosphere. Journal of Molecular Catalysis, 91 (1). pp. 61-69. ISSN 0304-5102 (print); 1873-3131 (online)

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Abstract

Ring enlargement and/or aromatization accompany the hydrogenative ring opening of propylcyclobutane over Pt/SiO2, Rh/SiO2 and Pd/SiO2 catalysts at high temperature. Ring enlargement provides only methylcyclohexane, while toluene and benzene are the products of aromatization. Both reactions occur over Pt/SiO2, whereas only aromatization takes place over the other two catalysts. Increasing hydrogen pressure favours direct methylcyclohexane formation, while under relatively hydrogen-poor conditions it forms via secondary pathways. Benzene formation is favoured by temperature increase and is probably due to the demethylation of adsorbed toluene-like species.

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