Hexamethylbenzene Radical Cations as Spin Probes for Acceptor Sites on the Surface of Sulfated Alumina

摘要

Sulfated zirconia and alumina exhibit unique acidic properties and catalytic activity in isomerization, cracking, acylation and alkylation processes at low temperatures. Earlier we have shown that sulfated zirconia catalysts have strong one-electron acceptor sites capable of ionizing various aromatic molecules with high ionization potentials to corresponding radical cations [1]. In this study we investigated in detail the formation and parameters of hexamethylbenzene (HMB) radical cations after HMB adsorption from different organic solvents on various sulfated alumina catalysts.