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Selective Hydrogenation of Cinnamaldehyde over Cobalt Supported on Alumina, Silica and Titania

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Abstract

The liquid phase selective hydrogenation of cinnamaldehyde has been investigated on cobalt (15 wt%) impregnated on alumina, silica and various phases of titania supports. The multiple reduction stages observed in the TPR studies suggest the presence of cobalt aluminate/silicate/titanate species, and DRIFT spectra results seem to corroborate this observation. An optimum level of conversion and selectivity to cinnamyl alcohol was observed at 120 °C and 10 kg/cm2 hydrogen pressure. Co/TiO2 exhibited a greater conversion (47.4%) and selectivity to cinnamyl alcohol (58%) than Co/Al2O3 and Co/SiO2, which may be attributed to the presence of TiO x (x < 2) species on the catalyst surface and to the preferential adsorption of C=O on the catalyst surface. The stability of Co/TiO2 was found to be better than Co/Al2O3 and Co/SiO2. Between the various phases of titania (high surface area, anatase and rutile), the crystalline phases exhibited a better conversion and selectivity to cinnamyl alcohol, while the stability was found to be better for high surface area titania.

Graphical Abstract

The liquid phase selective hydrogenation of cinnamaldehyde has been investigated on cobalt impregnated on Al2O3, SiO2 and TiO2 supports. The observed trend for conversion and selectivity to cinnamyl alcohol was Co/TiO2 > Co/SiO2 > Co/Al2O3. The hydrogenation of CMA is believed to preferentially proceed via adsorption of C=O on the surface of Co/TiO2.

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Acknowledgement

The authors acknowledge the Department of Science and Technology, Government of India for funding the National Centre for Catalysis Research (NCCR) at IIT-Madras.

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Authors and Affiliations

  1. National Centre for Catalysis Research, Indian Institute of Technology-Madras, Chennai, 600036, India

    K. Joseph Antony Raj, M. G. Prakash, T. Elangovan & B. Viswanathan

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  1. K. Joseph Antony Raj
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  2. M. G. Prakash
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  3. T. Elangovan
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  4. B. Viswanathan
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Correspondence to B. Viswanathan.

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Joseph Antony Raj, K., Prakash, M.G., Elangovan, T. et al. Selective Hydrogenation of Cinnamaldehyde over Cobalt Supported on Alumina, Silica and Titania. Catal Lett 142, 87–94 (2012). https://doi.org/10.1007/s10562-011-0693-0

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  • DOI: https://doi.org/10.1007/s10562-011-0693-0

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