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In an alkali-methanol solution, both 1- and 2-naphthol can be converted into 2-hydroxy-1,4-naphthoquinone(HNQ) with selectivity more than 95% by H_2O_2 over metalloporphyrin catalyst. The UV-Vis spectra indicate that a high valence oxygen-ferreous porphyrin intermediate has been produced by addition of an aqueous solution of H_2O_2 into the catalytic system. This intermediate formation rate is influenced by the concentrations of low valence ferrous porphyrin, H_2O_2, and NaOH existing in the system. With the aid of the UV-Vis spectrum varieties, the rate equations and formation rate constants of the intermediate at different temperatures can be determined by changing the original concentration of each reactant. The formation activation energy of this intermediate was also determined by changing temperature.
In an alkali-methanol solution, both 1- and 2-naphthol can be converted into 2-hydroxy-1,4-naphthoquinone (HNQ) with selectivity more than 95% by H 2 O 2 over metalloporphyrin catalyst. The UV-Vis spectra indicate that a high valence oxygen-ferreous porphyrin intermediate has been produced by addition of an aqueous solution of H 2 O 2 into the catalytic system. This intermediate formation rate is influenced by the concentrations of low valence ferrous porphyrin, H 2 O 2, and NaOH existing in the system. With the aid of the UV-Vis spectrum varieties, the rate equations and formation rate constants of the intermediate at different temperatures can be determined by changing the original concentration of each reactant. The formation activation energy of this intermediate was also determined by changing temperature.