Heterogeneous catalysis in supercritical water oxidation (SCWO) is a new approach to improve the reaction efficiency of the treatment of harzardous waste water.In this study,thekinetic analytic SCWO of coke works waste with manganese oxide (MnO_2) was performed to obtain fundamentaldata for the reactor design,as well as information about interactions affecting the reaction rate between thereactio species.The major component of the coke works wste is NH_3.Catalytic SCWO of NH_3 solution confirmed that MnO_2 is a good catalyst for the complete oxidation of NH_3.The presence of NH_3.The presence of NH_3 in themodelsolution did not affect the phenol conversion,but strongly suppressed the decomposition of totalorganic carbon (TOC).These inhibition effects between NH_3 and phenol are explainable by a Langmuir-type model,in which all corresonding species are assumed to adsorb cometitively on thesame catalytic site.Cataytic SCWO of diluted real waste showed a similar inhibition effect especially with shorter contact times of less than 0.5s.However,very high conversions of both NH_3 and TOC wereachieved witin 2s of contact time at 500degC.These experimental results suggest that catalytic SCWO is a promising technique for the complete decomposition of coke works waste.
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