Catalytic oxidation of 4-chloroguaiacol reaction kinetics and catalytic studies

This payer describes the non-catalytic oxidation and the solid-catalysed ox idation of a chlorinated organo-compound contained in softwood pulp mill ef fluents. The oxidation of 4-chloroguaiacol was catalysed efficiently using Pt/alumina, manganese/cerium and cobalt/bismuth composite oxide catalysts. Self-inhibition of the parent pollutant, recalcitrance of highly stable org anic by-products, and catalyst deactivation were the main causes that preve nted full mineralization of the waste-water organic load. A comprehensive h omogeneous-heterogeneous deactivation reaction network model was used to ac count for the distribution of carbon in the liquid, in the gas and on the s olid phases. The model combined a two-parallel reaction scheme for the non- catalytic oxidation and a Langmuir-Hinshelwood approach for the catalyst-me diated oxidation. (C) 2001 Published by Elsevier Science Ltd.