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Your search keyword '"Mathys, Georges"' showing total 18 results
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18 results on '"Mathys, Georges"'

1. Solvent-free aerobic oxidation of n-alkane by iron(III)-substituted polyoxotungstates immobilized on SBA-15

Author

Lifang Chen, Kake Zhu, Li-Hua Bi, Suchopar, Andreas, Reicke, Markus, Mathys, Georges, Jaensch, Helge, Kortz, Ulrich, and Richards, Ryan M.

Subjects
Coordination compounds -- Research, Coordination compounds -- Structure, Coordination compounds -- Chemical properties, Ligands -- Research, Ligands -- Chemical properties, Ligands -- Structure, Iron compounds -- Research, Iron compounds -- Chemical properties, Iron compounds -- Structure, Chemistry
Abstract

The catalytic performance for solvent-free aerobic oxidation of a long-chain n-alkane by iron(III)-substituted polyoxotungstates immobilized on 3-aminopropyl)triethoxysilane-modified mesoporous (SBA)-15 is described.

Published
2007

2. Organo-ruthenium supported heteropolytungstates: synthesis, structure, electrochemistry, and oxidation catalysis

Author

Li-Hua Bi, Al-Kadamany, Ghada, Chubarova, Elena V., Dickman, Michael H., Lifang Chen, Gopala, Divakara S., Richards, Ryan M., Keita, Bineta, Nadjo, Louis, Jaensch, Helge, Mathys, Georges, and Kortz, Ulrich

Subjects
Antimony -- Chemical properties, Antimony -- Structure, Benzene -- Chemical properties, Benzene -- Structure, Bismuth -- Chemical properties, Bismuth -- Structure, Infrared spectroscopy -- Usage, Nuclear magnetic resonance spectroscopy -- Usage, Oxidation-reduction reaction -- Analysis, Ruthenium -- Chemical properties, Ruthenium -- Structure, X-rays -- Diffraction, X-rays -- Usage, Chemistry
Published
2009

4. Organo-Ruthenium Supported Heteropolytungstates: Synthesis, Structure, Electrochemistry, and Oxidation Catalysis

Author

Bi, Li-Hua, primary, Al-Kadamany, Ghada, additional, Chubarova, Elena V., additional, Dickman, Michael H., additional, Chen, Lifang, additional, Gopala, Divakara S., additional, Richards, Ryan M., additional, Keita, Bineta, additional, Nadjo, Louis, additional, Jaensch, Helge, additional, Mathys, Georges, additional, and Kortz, Ulrich, additional

Published
2009
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9. Heterogeneous Wheel‐Shaped Cu20‐Polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25−Catalyst for Solvent‐Free Aerobic Oxidation of n‐Hexadecane

Author

Chen, Lifang, Hu, Juncheng, Mal, Sib Sankar, Kortz, Ulrich, Jaensch, Helge, Mathys, Georges, and Richards, Ryan M.

Abstract

The selective oxidation of alkanes as a green process remains a challenging task because partial oxidation is easier to achieve with sacrificial oxidants, such as hydrogen peroxide, alkyl hydroperoxides or iodosylbenzene, than with molecular oxygen or air. Here, we report on a heterogeneous catalyst for n‐hexadecane oxidation comprised of the wheel shaped Cu20‐polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25−anchored on 3‐aminopropyltriethoxysilane (apts)‐modified SBA‐15. The catalysts were characterized by powder X‐ray diffraction (XRD), N2‐adsorption measurements and Fourier transform infrared reflectance (FT‐IR) spectroscopy. The heterogeneous Cu20‐polyanion system catalyzed the solvent‐free aerobic oxidation of n‐hexadecane to alcohols and ketones by using air as the oxidant under ambient conditions. The catalyst exhibits an exceptionally high turn over frequency (TOF) of 20 000 h−1at 150 °C and is resistant to poisoning by CS2. Moreover, it can be easily recovered and reused by filtration without loss of its catalytic activity. Possible homogeneous contributions also have been examined and eliminated. Thus, this system can use air as oxidant, which, in combination with its good overall performance and poison tolerance, raises the prospect of this type of heterogeneous catalyst for practical applications.

Published
2009
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11. CATALYSTS AND THEIR USE IN OXIDATION OF SATURED HYDROCARBONS

Author

EXXON CHEMICAL PATENTS INC, HUYBRECHTS DIANE RENATA CORNEL, BUSKENS PHILIP LUC, MATHYS GEORGES MARIE KAREL, and MARTENS LUC ROGER MARC

Subjects
B01J29/28, B01J29/06, C07C51/285
Abstract

New titanium zeolite Beta catalysts which have been found to be useful as catalysts for the oxidation of organic compounds using organic hydroperoxides as oxidation catalysts. They are particularly useful as ring opening oxidation catalysts and may be used to produce adipic acid from cyclohexane.

18. Heterogeneous wheel-shaped Cu20-polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- catalyst for solvent-free aerobic oxidation of n-hexadecane.

Author

Chen L, Hu J, Mal SS, Kortz U, Jaensch H, Mathys G, and Richards RM

Abstract

The selective oxidation of alkanes as a green process remains a challenging task because partial oxidation is easier to achieve with sacrificial oxidants, such as hydrogen peroxide, alkyl hydroperoxides or iodosylbenzene, than with molecular oxygen or air. Here, we report on a heterogeneous catalyst for n-hexadecane oxidation comprised of the wheel shaped Cu20-polyoxotungstate [Cu20Cl(OH)24(H2O)12(P8W48O184)]25- anchored on 3-aminopropyltriethoxysilane (apts)-modified SBA-15. The catalysts were characterized by powder X-ray diffraction (XRD), N2-adsorption measurements and Fourier transform infrared reflectance (FT-IR) spectroscopy. The heterogeneous Cu20-polyanion system catalyzed the solvent-free aerobic oxidation of n-hexadecane to alcohols and ketones by using air as the oxidant under ambient conditions. The catalyst exhibits an exceptionally high turn over frequency (TOF) of 20,000 h(-1) at 150 degrees C and is resistant to poisoning by CS2. Moreover, it can be easily recovered and reused by filtration without loss of its catalytic activity. Possible homogeneous contributions also have been examined and eliminated. Thus, this system can use air as oxidant, which, in combination with its good overall performance and poison tolerance, raises the prospect of this type of heterogeneous catalyst for practical applications.

Published
2009
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