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Study of metalloporphyrin covalently bound to silica as catalyst in the ortho-dianisidine oxidation
- Source :
- Applied Catalysis A: General. 250:1-11
- Publication Year :
- 2003
- Publisher :
- Elsevier BV, 2003.
-
Abstract
- The model compounds for horseradish peroxidase (HRP) is reported, based on the association of H 2 O 2 with iron and manganese porphyrins immobilized onto a functionalized silica gel. The models were developed in an attempt to find a biomimetical compound for systems containing heme groups. The ortho -dianisidine is a useful substrate model compound for checking the ability of degradation promoted by delignificant natural enzymes. The heterogeneous catalysts were obtained by grafting of three metalloporphyrins: (Fe(TFPP)—iron porphyrin from the 5,10,15,20-tetrakis (pentafluorophenyl) porphyrin—and Mn(TCPP) and Fe(TCPP), iron and manganese porphyrins from the 5,10,15,20-tetrakis (4-carboxyphenyl) porphyrin), onto the modified surface of silica gel. The oxidation of ortho -dianisidine was monitored by UV-Vis spectroscopy at room temperature using different ratios of catalyst, oxidant and substrate. At high H 2 O 2 concentration, the perhalogenated iron porphyrin Fe(TFPP) produced best results, showing a turnover number of about 1100. This value was higher than those obtained for Fe(TCPP) and Mn(TCPP) systems.
Details
- ISSN :
- 0926860X
- Volume :
- 250
- Database :
- OpenAIRE
- Journal :
- Applied Catalysis A: General
- Accession number :
- edsair.doi...........5167a3edf14fccf8b6bbc1fe669e0886