Study on maximizing catalytic performance of cobalt(II) 5,10,15, 20-tetrakis(4-pyridyl)porphyrin for cyclohexane oxidation

Aiming at the most enhancing the catalytic performance of simple and cheap cobalt(II) 5,10,15,20-tetrakis (4-pyridyl)porphyrin (Co TPyP), guided by the nowadays-advanced various technologies, Co TPyP was anchored onto nanoporous bar with thiol-functionalized silica (npb-SiO2-SH). The resulting npb-SiO2-S-Co TPyP catalyst was characterized using various techniques, determining its structure. The total surface area ratios (TSAR) of the immobilized cobalt porphyrin to the npb-SiO2-SH, and the catalytic cyclohexane oxidation reaction conditions were at the same time optimized via Response Surface Methodology (RSM). Compared with those obtained from traditional optimizing method (TOM), on average, RSM could enhance as high as more than 60% catalyst turnover frequency (TOF) and yields of cyclohexanone and cyclohexanol (KA oil). The anchored 0.05 mg Co TPyP could catalyze the oxidation of 200 mt. of cyclohexane, under not using any solvents and additives, offering 2.5 x 10(6)1/h of TOF, and 19% of yields. The npb-SiO2-S (20%-0.0438)-Co TPyP catalyst showed better reusability, excellent catalytic (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.