A study on Kinetics of Mn2O3 catalytic oxidation about Supercritical (near) critical water of POPs

Abstract

Supercritical(near) critical water oxidation is a green and efficient method developed in recent years for the treatment of organic waste, The kinetics of Mn2O3 catalytic degradation of persistent organic pollutants (POPs) in Supercritical(near) critical water was studied. The reaction order, apparent activation energy and the feedback of three factors on catalytic degradation were determined. The experiment shows that under the conditions of temperature 280∼360°C, pressure 6.9∼ 20.3mpa and reaction time 5∼30min, Mn2O3 and hydrogen peroxide are used as the oxygen source without the catalyst. 4,4 ‘-dibromobiphenyl has a reaction order of 1.71, Apparent activation energy 46.56 kJ/mol; Mn2O3 catalyst was used, the reaction order of 4,4 ‘-dibromobiphenyl was 1.79, and the apparent activation energy was 37.89 kJ/mol. Therefore, Mn2O3 as a catalyst can significantly degrade the activation energy of POPs in near-critical water.