Significant Formation of Adipic Acid by Direct Oxidation of Cyclohexane Using Supported Nano-Gold Catalysts

Authors

  • Dr. Ahmad Alshammari,

    Corresponding author
    1. National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, P. O. Box 6086, Riyadh 11442 (Saudi Arabia), Fax: (+966) 1-481-4574
    • National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, P. O. Box 6086, Riyadh 11442 (Saudi Arabia), Fax: (+966) 1-481-4574
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  • Dr. Angela Koeckritz,

    1. Department of Heterogeneous Catalytic Processes, Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-51246
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  • Dr. Venkata Narayana Kalevaru,

    1. Department of Heterogeneous Catalytic Processes, Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-51246
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  • Dr. Abdulaziz Bagabas,

    1. National Nanotechnology Research Center, King Abdulaziz City for Science and Technology, P. O. Box 6086, Riyadh 11442 (Saudi Arabia), Fax: (+966) 1-481-4574
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  • Dr. Andreas Martin

    1. Department of Heterogeneous Catalytic Processes, Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock (Germany), Fax: (+49) 381-1281-51246
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Abstract

Adipic acid (AA) is one of the highest volume chemicals in world use with a wide range of commercial applications. This paper demonstrates the possibility of producing significant proportions of AA by the selective oxidation of cyclohexane (CH) in one step using various supported gold-nanoparticle (AuNP) catalysts. The catalysts were characterized by ICP, BET, XRD, X-ray photoelectron microscopy, and TEM. The catalytic activity tests were carried out in the liquid phase using autoclaves in the temperature range of 100–170 °C at 10 bar. A CH conversion of over 25 %, with 26% selectivity of AA and 70% selectivity of KA oil (cyclohexanone+cyclohexanol), was achieved over a nano-gold/TiO2 (anatase) catalyst. The superior performance of this catalyst is attributed to the smaller size of AuNPs, which has an average particle size of 2 nm. Good correlation between activity and Au particle size could be achieved. Overall, the particle size of the AuNPs showed a strong influence on catalytic performance.

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