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Catalytic Aerobic Oxidation of Cyclohexane and Ethyl Benzene Over Chromium-Containing Mesoporous Organosilicas

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Abstract

Chromium-containing ethane-bridged hybrid periodic mesoporous organosilicas (Cr-PMO) were synthesized using 1,2-bis(triethoxysilyl)ethane (BTEE) and tetraethyl orthosilicate (TEOS) as silica sources and alkyltrimethyl ammonium salts as surfactants by two different synthesis routes. PXRD and N2 adsorption–desorption analysis shows that the original structure of the materials is maintained after chromium substitution while spectroscopic study proves the incorporation of chromium in the frame wall positions and show the existence of Cr2O3 species in the mixed silica source (BTEE-TEOS) synthesized chromium samples. The catalytic activity of the newly developed chromium samples was evaluated in the liquid phase oxidation of cyclohexane and ethylbenzene using air as an oxidant. Further, the Cr-PMO samples exhibited better cyclohexane conversion and cyclohexanone selectivity than the conventional Cr-MCM-41 and other metal-containing MCM-41 samples. The exceptional activity of the new chromium-containing molecular sieves is attributed to the hydrophobicity of the materials and to the complementary structural features that facilitates the accessibility of substrate to the active framework chromium sites.

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Acknowledgments

APS thanks FY2007 JSPS (Japan Society for the Promotion of Science) Invitation Fellowship Programme for Research in Japan (Long-Term-ID No. L-07548) for the financial support. We thank Mr. R. K. Jha for the adsorption analysis and Dr. S. P. Mirajkar for the TPR analysis.

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Authors and Affiliations

  1. Inorganic and Catalysis Division, National Chemical Laboratory, Pune, 411 008, India

    A. P. Singh & S. Shylesh

  2. Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    N. Torita, N. Iwasa & M. Arai

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  1. A. P. Singh
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  2. N. Torita
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  3. S. Shylesh
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  4. N. Iwasa
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  5. M. Arai
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Correspondence to A. P. Singh or M. Arai.

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Singh, A.P., Torita, N., Shylesh, S. et al. Catalytic Aerobic Oxidation of Cyclohexane and Ethyl Benzene Over Chromium-Containing Mesoporous Organosilicas. Catal Lett 132, 492–499 (2009). https://doi.org/10.1007/s10562-009-0121-x

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  • DOI: https://doi.org/10.1007/s10562-009-0121-x

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