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Title

SYNTHESIS, CHARACTERIZATION AND IMMOBILIZATION OF IRON (III) PYRIDOXINATO COMPLEX WITHIN AL-MCM-41 AS CATALYST FOR OXIDATION OF CYCLOALKANES

Pages

 Start Page | End Page

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Abstract

 THE SELECTIVE OXIDATION OF ALKANES IS A CHALLENGING SUBJECT. COMPARED TO THE LOW-COST RAW MATERIALS, PRODUCTION OF MORE VALUABLE OXIDIZED PRODUCTS IS AN ECONOMICALLY IMPORTANT APPROACH. THE ALKANES OXIDATION IS OF SPECIAL INTEREST TO THE INDUSTRY [1]. PRODUCTIONS OF CATALYSTS THAT DO NOT EXPAND TOO MUCH ENERGY WITH UTILIZATION OF LESS HARMFUL OXIDANTS HAVE BEEN DEVELOPED DURING THE LAST YEARS. NATURE HAS EVOLVED A NUMBER OF UNIQUE METAL ENZYMES SUCH AS THE HEM CONTAINING CYTOCHROME P-450 AND NON-HEM MONOOXYGENASE [2, 3].IN THIS WORK, BIOMIMETIC [FE(PYRIDOXINES)2OH.(H2O)3] NONHEM COMPLEX DESIGNATED AS [FE(L)2OH.(H2O)3] WAS SYNTHESIZED WITH BASIC SOLUTION OF PYRIDOXINE (VITAMIN B6) AND FECL3 IN METHANOL UNDER REFLUX CONDITION. IT WAS THEN IMMOBILIZED WITHIN THE AL-MCM-41 (FIG. 1). CHARACTERIZATIONS WERE CARRIED OUT BY POWDER X-RAY DIFFRACTION, NITROGEN ADSORPTION DESORPTION, FTIR AND UV–VIS SPECTROSCOPY. IT WAS FOUND THAT PORE VOLUME, SURFACE AREA, AND PORE DIAMETER OF AL-MCM-41 DECREASES AFTER IMMOBILIZATION OF IRON COMPLEX. DENSITY FUNCTIONAL THEORY STUDIES CONFIRMED THE EXPERIMENTAL RESULTS OF [FE(L)2OH.(H2O)3] COMPLEX. FE-COMPLEX/AL-MCM-41 WAS FOUND TO SUCCESSFULLY CATALYZE THE OXIDATION OF CYCLOHEXANE, CYCLOOCTANE AND ADAMANTANE USING H2O2 AS OXIDANT WITH 45–90% CONVERSION TOWARD THE CORRESPONDING ALCOHOLS AND KETONES IS CONSIDERABLE.

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