This is explained by the decrease in the concentration of H2O2, and therefore it is the effect of CO2 that remains predominant (constant CO2 pressure) thus leading to cracking reactions. Interaction of cumylperoxy radicals with aliphatic monocarboxylic acid esters. Effect of AC support on cumene oxidation. Other reactants required are oxygen from air and small amounts of a radical initiator. Table 1. The results obtained are illustrated in figure 9. Mitteil. Figure 1 shows the FT-IR spectra of the oxidized AC, CoPW and AC-CoPW catalysts. XRD characterization were carried out employing an Ultima IV x-ray Rigaku diffractometer using Cu-Kα radiation. Variation of the conversion and product selectivities with reaction time over AC-CoPW catalyst. Table 2. Manfred Weber, Markus Weber, Michael Kleine-Boymann "Phenol" in Ullmann's Encyclopedia of Industrial Chemistry 2004, Wiley-VCH. You’ve supercharged your research process with ACS and Mendeley! Reactivity of cumyl and α-phenylethylperoxy radicals in interaction with n-alkanes. Via the Hock rearrangement, cyclohexylbenzene hydroperoxide cleaves to give phenol and cyclohexanone. Res. Chemiluminescence accompanying the co-oxidation of a mixture consisting of cumene and tetraline. The desired amount of carbon support was dispersed in 100 ml of nitric acid (65%) and heated for 5 h at 80 °C with stirring. The conversion decay observed for temperatures above 75 °C could be attributed to the decomposition of H2O2. Higher CO2 pressure and short reaction times favor Ph-PrOH formation, whereas longer reaction times favor Ph = O and Ph-OH. In fact, it has been reported that when hydrogen peroxide is used with carbon dioxide its efficiency increased (Hâncu et al 2002, Nolen et al 2002). Therefore, the optimal mass fraction 0.29 was selected for all subsequent investigations. This site uses cookies. Naaser A Y Abduh1, Tahani Al-Garni1, Abdullah Al Kahtani1 and Ahmed Aouissi1, Published 17 February 2020 • It has also been reported by Hâncu et al 2002 that a biphasic aqueous H2O2/CO2 mixture is an efficient epoxidizing system, where {{\rm{HCO}}}_{4}^{-} is formed through various reactions of water, CO2, and H2O2 and transfers of oxygen to alkenes (equations (2) and (3)). Indeed, the unsupported CoPW catalyst has only Lewis type acid sites, whereas the supported catalyst ACA-CoPW has, in addition to these Lewis type acid sites, Brønsted type acid sites on the surface of the activated carbon. This is expected since cumene is insoluble in the aqueous phase, it is the alcohols that are oxidized instead. These reflections indicated that the graphitic structure of AC was preserved after oxidation treatment. Published by IOP Publishing Ltd, Belgian Nuclear Research Center (SCK CEN), Shandong Institute of Advanced Technology, Research Engineer in Materials Science and Strain Measurements using Neutron Diffraction. Elemental analysis data of the prepared CoPW and AC-CoPW. In order to improve the yields of Ph-PrOH and Ph = O, an optimization of the reaction was carried out. P. Andrigo, A. Caimi, P. Cavalieri d'Oro, A. Fait, L. Roberti, M. Tampieri, V. Tartari. The Cooxidation of Hydrocarbons in the Liquid Phase. The results (figure 6) show that increasing H2O2/cumene volume ratio increased the conversion to a maximum value of 46.4% for a volume ratio of 2 and then gradually decrease to a value of 20.3% for a volume ratio of 3.5. Cooxidation of Hydrocarbons in Liquid Phase. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Variation of the conversion and product selectivities with catalyst amount over AC-CoPW catalyst.

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