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- W2003014404 abstract "Oxidation of naphthalene (Nap) in supercritical water (SCW) was carried out in a batch reactor (6-ml volume) up to 400 °C and 300 atm (maximum residence time of 1800 s). Two systems were studied. System A consisted of pure naphthalene mixed with oxygen and water: 0.065 M Nap + 1.441 M O2 + 8.549 M H2O. System B included, in addition to O2 and H2O, a heavy metal and an ash to simulate their roles in the destruction of Nap: 0.065 M Nap + 1.441 M O2 + 0.008 M Cr(NO3)3 + 0.065 M Al2Si2O5·(OH)4 + 8.624 M H2O. It was shown that, in general, the oxidation process can be divided into three stages characterized by H2O2 decomposition to H2O and O2 (Stage 1), oxidation in saturated/subcritical water up to 360 °C and 225 atm (Stage 2), and fast oxidation in the supercritical region (Stage 3). The oxidation process revealed different reaction rates in different systems. Relatively low activation energy of 10–30 kJ/mol was obtained below 360 °C and 225 atm in the System A and in the whole temperature range in the System B. High activation energy (139.5 kJ/mol) was obtained for supercritical water oxidation of naphthalene in the System A. The catalytic effect of Cr3+/ash stimulated naphthalene oxidation. Time-resolved yields of major products and intermediates were obtained. The reaction pattern was proposed. It describes the evolution of naphthalene and intermediates as a sequence of reactions comprising transformations of the main compounds and their inter-conversion. This radical-involving reaction mechanism is mainly based on the quantification of the profiles of the intermediates." @default.
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- W2003014404 date "2011-01-01" @default.
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- W2003014404 title "Evolution of naphthalene and its intermediates during oxidation in subcritical/supercritical water" @default.
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- W2003014404 doi "https://doi.org/10.1016/j.proci.2010.09.010" @default.
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