LU Yan^1,2, XIE Bing^1,2*, HUANG Chun³, HE Xiyang², ZOU Like^1,2, LIN Xiao³, WANG Yanmei³

(1.　  Institute of Functional Materials, Sichuan University of Science & Engineering, Zigong, 643000, China; 2. University Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education, Zigong, 643000, China; 3. School of Material and Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China)

Abstract: The kinetics of oxidative reaction of hydroquinone (HQ) with hydrogen peroxide catalyzed by water-soluble metalloporphyrins, Fe(TPPS)Cl and Co(TPPS) where TPPS = tetra(p-sulfonate)porphyrin, were studied by means of UV-vis spectrophotometer at 25℃. The acidity of the system, hydrogen peroxide / catalyst molar ratio and metal ions on the catalytic reaction were investigated. The oxidative mechanism of hydroquinone catalyzed by metalloporphyrin was proposed, and a kinetic model was established. The results show that Fe(TPPS)Cl and Co(TPPS) exhibit peroxidase-catalyzed oxidation characteristics. Therefore, the use of metalloporphyrin as peroxidase in the simulation process of hydroquinone oxidation is an effective catalyst.

Key words: tetra(p-sulfonate)porphyrin; water-soluble metalloporphyrin; hydrogen peroxide; hydroquinone oxidation; kinetics

E-mail: xiebinghg@sina.com.cn

Journal of Molecular Catalysis, Vol. 25, Issue 6, 2011, 534-540