A magnetically separable SO 4 /Fe-Al-TiO 2 solid acid catalyst for biodiesel production from waste cooking oil


A novel magnetic SO4/Fe-Al-TiO2 solid acid catalyst was synthesized for biodiesel production via the (trans)esterification of waste cooking oil (WCO). The nanocomposite catalyst was prepared by the sequential functionalisation of commercial rutile/anatase mixed phase TiO2 nanoparticles (NPs) with alumina as a buffer layer, and subsequently hematite to impart magnetic character, prior to sulfation with chlorosulfonic acid to introduce Brønsted acidity. XRD showed that the SO4/Fe-Al-TiO2 catalyst comprised titania (rutile and anatase phases), aluminium sulphate, and hematite nanoparticles, while electron microscopy revealed the layer-by-layer assembly of these components within the SO4/Fe-Al-TiO2 catalyst. FTIR confirmed the presence of surface sulphate groups SO42- and S2O72-/S3O102-, creating a predominantly Brønsted acid catalyst with high acid loading. The catalyst achieved 96 % fatty acid methyl ester (FAME) yield from WCO after 2.5 h of reaction at 90 °C, using 3 wt% of the magnetic catalyst, and a methanol:oil molar ratio of 10:1. SO4/Fe-Al-TiO2 was also effective for feedstocks containing up to 20 wt% of free fatty acid (FFA), and showed excellent stability for WCO (trans)esterification over 10 recycles.

Publication DOI: https://doi.org/10.1016/j.apcatb.2018.04.046
Divisions: College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
College of Engineering & Physical Sciences
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Uncontrolled Keywords: Solid acid catalyst,(trans)esterification,magnetic nanoparticle,biodiesel,waste cooking oil
Publication ISSN: 1873-3883
Last Modified: 08 Jul 2024 07:40
Date Deposited: 24 Apr 2018 14:35
Full Text Link:
Related URLs: http://linkingh ... 926337318303758 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-10-15
Published Online Date: 2018-04-20
Accepted Date: 2018-04-18
Authors: Gardy, Jabbar
Osatiashtiani, Amin (ORCID Profile 0000-0003-1334-127X)
Céspedes, Oscar
Hassanpour, Ali
Lai, Xiaojun
Lee, Adam F.
Wilson, Karen
Rehan, Mohammad

Export / Share Citation


Additional statistics for this record