Abstract
This study gives details of the ESR effects observed when quinhydrone and hydroquinone/ p-benzoquinone mixtures of varying composition ratio are adsorbed on high surface-area samples of silica-alumina, γ-alumina, magnesium oxide, and zinc oxide. The purpose is to test the hypothesis that in considering the phenomena of radical formation on surfaces that posses both electron donor and electron acceptor sites, it is necessary to explicitly take into account an indirect cooperative interaction between the donor and acceptor sites in analyzing the data. The correctness of the hypothesis is demonstrated and the implications thereof as concerns the currently used method to determine redox site density on these types of oxide surfaces is briefly considered. Preliminary data are provided on the donor and acceptor site density on the four materials listed above as determined by the quinhydrone method.
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