Free-H2 deoxygenation of Jatropha curcas oil into cleaner diesel-grade biofuel over coconut residue-derived activated carbon catalyst

Nurul Asikin Mijan, and J.M. Ooi, and Abdulkareem Ghassan Alsultan, and H.V. Lee, and Mohd Sufri Mastuli, and Nasar Mansir, and Fahad A. Alharti, and Abdulaziz Alghamdi, and Yap, Taufiq Yun Hin (2019) Free-H2 deoxygenation of Jatropha curcas oil into cleaner diesel-grade biofuel over coconut residue-derived activated carbon catalyst. Journal of Cleaner Production, 249. ISSN 0959-6526

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Abstract

Diesel-like hydrocarbons were produced by the catalytic deoxygenation (DO) of Jatropha curcas oil (JCO) over novel Agx/AC and Niy-Agx/AC catalysts under an H2-free atmosphere. The AC was synthesized from coconut fibre residues (CFR), where CFR is the by-product from coconut milk extraction and is particularly rich in soft fibres with high mineral content. The Niy-Agx/AC catalyst afforded higher DO activity via the decarboxylation/decarbonylation (deCOx) route than Agx/AC due to the properties of Ni, synergistic interaction of Ni and Ag species, adequate amount of strong acid sites and large number of weak acid sites, which cause extensive C-O cleavage and lead to rich formation of n-(C15+C17) hydrocarbons. The effect of Ag and Ni content were studied within the 5 to 15 wt% range. An optimum Ni and Ag metal content (5 wt%) for deCOx reaction was observed. Excess Ni is not preferable due to a tendency for cracking and Ag-rich containing catalyst weakly enforced triglycerides breaking. The Ni5-Ag5/AC govern exclusively decarbonylation reaction, which corroborates the presence of Ni²⁺ species and a high amount of strong acid sites. Ultimately, Ni5-Ag5/AC in the present study shows excellent chemical stability with consistent five reusability without drastic reduction of hydrocarbon yield (78–95%) and n-(C15+C17) selectivity (82–83%), which indicate favourable application in JCO DO.

Item Type: Article
Uncontrolled Keywords: Ag2O , Carbon , Deoxygenation , Decarboxylation/decarbonylation, NiO
Subjects: Q Science > QK Botany
Depositing User: Noraini
Date Deposited: 07 Jun 2020 10:13
Last Modified: 07 Jun 2020 10:13
URI: http://eprints.ums.edu.my/id/eprint/25486

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