Abstract
The formation of p-benzosemiquinone anion radical in a hydroquinone aqueous solution over manganese dioxide has been studied by e.s.r. spectroscopy. The rate of the formation of the radical strictly obeyed equation (i) d[SA]/dt=k(b[HQ]0–[SA])(c[MnO2]0–[SA])(i) where k, b, and c are constants, [MnO2]0 is the MnO2 weight : liquid volume ratio, and [HQ]0 and [SA] are the initial concentrations of hydroquinone and semiquinone anion radical, respectively. The following reaction mechanism is proposed. The surface species MnO2* abstracts a hydrogen atom from hydroquinone to form a neutral semiquinone radical which desorbs into the liquid phase and is converted into semiquinone anion radical, while the surface species MnO2* is deactivated and reduced to Mn(OH)2*. The number of surface species, MnO2*, is determined as 7.7 × 1018 m–2.
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