Selective hydrogenation of stearic acid to stearyl alcohol over cobalt alumina catalysts

Zeni Rahmawati; James A. Anderson; Alan McCue

doi:10.1016/j.apcata.2023.119437

Selective hydrogenation of stearic acid to stearyl alcohol over cobalt alumina catalysts

Zeni Rahmawati
, James A. Anderson
, Alan McCue^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

11 Downloads (Pure)

Abstract

The selective hydrogenation of stearic acid to produce stearyl alcohol at 300°C and 50 bar pressure was studied over a series of cobalt alumina catalysts with different cobalt loadings. Catalysts were prepared by wet impregnation and characterised by X-ray diffraction, H2 temperature programmed reduction, H2 chemisorption, N2 adsorption-desorption and Fourier-transform infrared spectroscopy. Stearyl alcohol was observed to be the main reaction product, although heptadecane, octadecane and stearyl stearate were also produced in lesser amounts. The product selectivity was influenced by the availability of Lewis acid sites on the support which were found to be responsible for ester formation. Increasing the cobalt loading diminished the number of acid sites on the support surface whilst increasing the number of cobalt metal sites and thus enhanced the relative rate of hydrogenation leading to improved selectivity to stearyl alcohol.

Original language	English
Article number	119437
Number of pages	9
Journal	Applied Catalysis A: General
Volume	666
Early online date	7 Oct 2023
DOIs	https://doi.org/10.1016/j.apcata.2023.119437
Publication status	Published - Oct 2023

Data Availability Statement

Data Availability
Data will be made available on request.

Supporting information
Supplementary data associated with this article can be found in the online version at doi:10.1016/j.apcata.2023.119437.

Funding

Acknowledgements We thank the Indonesia Endowment Fund for Education/Lembaga Pengelola Dana Pendidikan (LPDP), Ministry of Finance Indonesia for providing the studentship (Z.R.) at the University of Aberdeen, UK. The authors are grateful to Professor Justin Hargreaves (University of Glasgow) for his help on the ‘Outbound Researcher Mobility’ scheme funded by the Sepuluh Nopember Institute of Technology, Indonesia.

Funders
Indonesia Endowment Fund for Education/Lembaga Pengelola Dana Pendidikan (LPDP)
Institut Teknologi Sepuluh Nopember

Keywords

cobalt
alumina
stearic acid
hydrogenation
stearyl alcohol

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title = "Selective hydrogenation of stearic acid to stearyl alcohol over cobalt alumina catalysts",

abstract = "The selective hydrogenation of stearic acid to produce stearyl alcohol at 300°C and 50 bar pressure was studied over a series of cobalt alumina catalysts with different cobalt loadings. Catalysts were prepared by wet impregnation and characterised by X-ray diffraction, H2 temperature programmed reduction, H2 chemisorption, N2 adsorption-desorption and Fourier-transform infrared spectroscopy. Stearyl alcohol was observed to be the main reaction product, although heptadecane, octadecane and stearyl stearate were also produced in lesser amounts. The product selectivity was influenced by the availability of Lewis acid sites on the support which were found to be responsible for ester formation. Increasing the cobalt loading diminished the number of acid sites on the support surface whilst increasing the number of cobalt metal sites and thus enhanced the relative rate of hydrogenation leading to improved selectivity to stearyl alcohol. ",

keywords = "cobalt, alumina, stearic acid, hydrogenation, stearyl alcohol",

author = "Zeni Rahmawati and Anderson, \{James A.\} and Alan McCue",

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doi = "10.1016/j.apcata.2023.119437",

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T1 - Selective hydrogenation of stearic acid to stearyl alcohol over cobalt alumina catalysts

AU - Rahmawati, Zeni

AU - Anderson, James A.

AU - McCue, Alan

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N2 - The selective hydrogenation of stearic acid to produce stearyl alcohol at 300°C and 50 bar pressure was studied over a series of cobalt alumina catalysts with different cobalt loadings. Catalysts were prepared by wet impregnation and characterised by X-ray diffraction, H2 temperature programmed reduction, H2 chemisorption, N2 adsorption-desorption and Fourier-transform infrared spectroscopy. Stearyl alcohol was observed to be the main reaction product, although heptadecane, octadecane and stearyl stearate were also produced in lesser amounts. The product selectivity was influenced by the availability of Lewis acid sites on the support which were found to be responsible for ester formation. Increasing the cobalt loading diminished the number of acid sites on the support surface whilst increasing the number of cobalt metal sites and thus enhanced the relative rate of hydrogenation leading to improved selectivity to stearyl alcohol.

AB - The selective hydrogenation of stearic acid to produce stearyl alcohol at 300°C and 50 bar pressure was studied over a series of cobalt alumina catalysts with different cobalt loadings. Catalysts were prepared by wet impregnation and characterised by X-ray diffraction, H2 temperature programmed reduction, H2 chemisorption, N2 adsorption-desorption and Fourier-transform infrared spectroscopy. Stearyl alcohol was observed to be the main reaction product, although heptadecane, octadecane and stearyl stearate were also produced in lesser amounts. The product selectivity was influenced by the availability of Lewis acid sites on the support which were found to be responsible for ester formation. Increasing the cobalt loading diminished the number of acid sites on the support surface whilst increasing the number of cobalt metal sites and thus enhanced the relative rate of hydrogenation leading to improved selectivity to stearyl alcohol.

KW - cobalt

KW - alumina

KW - stearic acid

KW - hydrogenation

KW - stearyl alcohol

U2 - 10.1016/j.apcata.2023.119437

DO - 10.1016/j.apcata.2023.119437

M3 - Article

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VL - 666

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

M1 - 119437

ER -

Selective hydrogenation of stearic acid to stearyl alcohol over cobalt alumina catalysts

Abstract

Data Availability Statement

Funding

Keywords

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