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The Oxidative Dehydrogenation of n-Hexane over a β-NiMoO4 Catalyst

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Abstract

The oxidative dehydrogenation of n-hexane over β-NiMoO4 catalysts was performed in a fixed bed continuous flow reactor. Catalytic testing was done below and above the flammability limits for n-hexane and the effect of reaction conditions was examined to optimize hexene selectivity. The contact times (0.61-2.4 s), n-hexane/oxygen molar ratios and nitrogen dilution (31–60%) were varied. The highest selectivity to total hexenes obtained was 54.7% which was made up of 27.4% 1-hexene, 25.0% trans-2-hexene and 2.3% cis-2-hexene. These selectivities were obtained at a fuel/O2 ratio of 2.2, a contact time of 1.0 s and 43% nitrogen dilution.

Graphical Abstract

The oxidative dehydrogenation of n-hexane was investigated over β-NiMoO4. Effects of contact time, dilution and fuel air ratios were investigated. The highest selectivity to the hexenes, mainly 1-hexene, was obtained at a contact time of 1 s at a fuel/air ratio of 2.2 and 43% N2 dilution.

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Acknowledgments

We thank Sasol Technology, THRIP, NRF and c*change for support and Denzil Moodley (Sasol, Technical University of Eindhoven) for the XPS and TPO-MS results.

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  1. School of Chemistry, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban, 4000, South Africa

    Bavani Pillay, Mfanuwenkosi R. Mathebula & Holger B. Friedrich

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  1. Bavani Pillay
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  2. Mfanuwenkosi R. Mathebula
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  3. Holger B. Friedrich
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Correspondence to Holger B. Friedrich.

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Pillay, B., Mathebula, M.R. & Friedrich, H.B. The Oxidative Dehydrogenation of n-Hexane over a β-NiMoO4 Catalyst. Catal Lett 141, 1297–1304 (2011). https://doi.org/10.1007/s10562-011-0651-x

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