ISOMERIZATION OF OLEFIN RADICAL CATIONS IN ZSM-5 ZEOLITES

Variable-temperature EPR was used to investigate reactions of olefin r adical cations generated radiolytically in nonacidic and acidic ZSM-5 zeolites. The olefin radical cations undergo isomerization reactions e ven at 4 K. Radical cation reactions are presumably driven by the exot hermicity of charge transfer, which is not efficiently quenched by the vibrational modes of the zeolite lattice. The observation of H-additi on type radicals indicates Bronsted acid-catalyzed rearrangements prio r to irradiation on the more acidic zeolites.