The efficient liquid‐phase oxidation of aromatic hydrocarbons by molecular oxygen in the presence of MnCO3

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Graduate School of the Chinese Academy of Sciences, Liaoning 116023, PR China
Journal of Chemical Technology & Biotechnology (Impact Factor: 2.5). 06/2007; 82(7):620 - 625. DOI: 10.1002/jctb.1717

ABSTRACT BACKGROUND: The liquid-phase catalytic oxidation of aromatic hydrocarbons by molecular oxygen is a commercially important process. We consider the MnCO3-promoted oxidation of toluene to produce benzaldehyde and benzoic acid. In this investigation, toluene was oxidized with 25.0% conversion and 80.8% selectivity with respect to benzoic acid in the presence of MnCO3 under 1.0 MPa of oxygen at 190 °C for 2 h.RESULTS: Moreover, the oxidation of other aromatic hydrocarbons, such as ethylbenzene, p-xylene, m-xylene, o-xylene, and p-chlorotoluene, were also efficiently promoted by MnCO3.CONCLUSION: It is concluded that an efficient oxidation of aromatic hydrocarbons can be achieved in the presence of MnCO3 under solvent-free conditions. The catalytically active species are high-valence Mn generated via the action of MnCO3 with oxygen. Copyright © 2007 Society of Chemical Industry

  • [Show abstract] [Hide abstract]
    ABSTRACT: BACKGROUND: Hydrocarbon oxidation reactions are central to numerous processes that convert bulk chemicals into useful and higher-value products. In this investigation, an efficient metal-free catalytic system for aerobic oxidation of aromatic hydrocarbons was successfully established by synthesizing a series of aryl-tetrahalogenated N-hydroxyphthalimides and applying these compounds with 1,4-diamino-2,3-dichloroanthraquinone (DADCAQ).RESULTS: Ethylbenzene was oxidized with 82.3% conversion and 86.9% selectivity to acetophenone catalyzed by the system of TCNHPI/DADCAQ under 0.3 MPa of molecular oxygen at 100 °C for 5 h. Other hydrocarbons were oxidized with high efficiency using this catalytic system. For example, indane can be converted completely to indan-1-one with 98.0% selectivity.CONCLUSION: A highly efficient metal-free catalytic system consisting of TCNHPI and DADCAQ was developed for the oxidation of aromatic hydrocarbons with molecular oxygen. Aryl-halogen substituents served to significantly increase the activities of the catalytic system. The results in this study can form the basis for the design of an efficient hydrocarbon oxidation process. Copyright © 2008 Society of Chemical Industry
    Journal of Chemical Technology & Biotechnology 09/2008; 83(10):1364 - 1369. · 2.50 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: BACKGROUND: Catalytic oxidation of toluene with dioxygen is a fundamental industrial technology because the oxidized products are important intermediates for many fine chemicals. In this study, phenyl modification was utilized to alter catalyst surface characteristics in order to enhance activity.RESULTS: Phenyl groups were successfully immobilized on the surface of Mn-containing hexagonal mesoporous silica (HMS) through a one-step synthesis route, as demonstrated by detailed characterization. As a result, the surface of the catalyst PhMnHMS was more hydrophobic with a water droplet contact angle of 96°. In the oxidation of toluene to benzoic acid with dioxygen under solvent-free conditions, this new catalyst showed higher activity and selectivity than non-organomodified MnHMS, and the conversion and selectivity increased by a factor of 40% and 9%, respectively.CONCLUSION: Modification of the catalyst surface with phenyl groups was an effective strategy to increase activity in the oxidation of toluene. Both conversion and selectivity were improved and this is linked to the hydrophobic character of the surface. This organic modification strategy may also be extended for oxidation of other hydrocarbons. Copyright © 2009 Society of Chemical Industry
    Journal of Chemical Technology & Biotechnology 12/2009; 85(2):283 - 287. · 2.50 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A new solvent-free, reusable catalytic combination consisting of WO3/70 % TBHP/aqueous NaOH has been described for the direct oxidation of methylarenes and acetophenones to the corresponding benzoic acids in high yields. Alkylarenes are oxidized to the corresponding aromatic ketones or benzylic alcohols depending upon whether NaOH is used or not.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
    Annalen der Chemie und Pharmacie 10/2008; 2008(29):4877-4880. · 3.10 Impact Factor

Full-text (2 Sources)

Available from
Jun 11, 2014