The formation of SO2- radicals on CaO has been studied by e.s.r. spectroscopy. CaO, prepared by evacuating CaCO3 at 1173 K was exposed to sulphur dioxide at 473 K. Under these conditions, SO 2- radicals were observed at concentrations of ≈ 3 × 1017 spins g-1. The effect of the heat-treatment temperature of the starting CaCO3 and of the adsorption temperature have been examined. The SO2- radicals are stable up to 473 K, but decay with second order kinetics above 498 K. The radicals react with oxygen to form SO4- radicals at 77 K and SO 3- radicals at room temperature.
|Number of pages||6|
|Journal||Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases|
|State||Published - 1979|