Radiolysis of phenol in aqueous solution at elevated temperatures

gamma-Radiolysis and pulse radiolysis of phenol in aqueous solution up to supercritical condition have been carried out. G-values of phenol consumption and product formation have been determined. While dihydroxybenzenes were major products at room temperature, multi-ring compounds and benzene were formed above 300 degrees C. This indicates reaction mechanism was changed above 300 degrees C, where phenoxyl radical plays a predominant role. This is supported by the observation of phenoxyl radical in pulse radiolysis. In supercritical water, the G-values increased with decrease of density. (c) 2005 Elsevier Ltd. All rights reserved.