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Preparation and optimization of macroalgae-derived solid acid catalysts

Jimenez Toro, Maria J, Dou, Xin, Ajewole, Isaac, Wang, Jiawei, Chong, Katie, Ai, Ning, Zeng, Ganning and Chen, Tao (2017) Preparation and optimization of macroalgae-derived solid acid catalysts Waste and Biomass Valorization.

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Abstract

Solid acid catalysts were synthesized from macroalgae Sargassum horneri via hydrothermal carbonization followed by sulfuric acid sulfonation. A three-variable Box-Behnken design and optimization was used to maximize surface acidity. The optimal preparation conditions were found to be at the carbonization temperature of 217 °C, the carbonization time of 4.6 hours and the sulfonation temperature of 108.5 °C. Under these conditions, the highest surface acidity achieved was 1.62 mmol g-1. Physical and chemical properties of prepared solid acid catalyst were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, and elemental analysis. The results proved the grafting of -SO3H groups on an amorphous carbon structure. The catalyst activity was evaluated by the esterification of oleic acid with methanol. The sample prepared achieved 96.6% esterification yield, which was higher than the 86.7% yield achieved by commercial Ambersyst-15 under the same reaction conditions.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Jimenez Toro, Maria JUNSPECIFIEDUNSPECIFIED
Dou, XinUNSPECIFIEDUNSPECIFIED
Ajewole, IsaacUNSPECIFIEDUNSPECIFIED
Wang, JiaweiUNSPECIFIEDUNSPECIFIED
Chong, KatieUNSPECIFIEDUNSPECIFIED
Ai, NingUNSPECIFIEDUNSPECIFIED
Zeng, GanningUNSPECIFIEDUNSPECIFIED
Chen, TaoT.Chen@surrey.ac.ukUNSPECIFIED
Date : 2017
Uncontrolled Keywords : Solid acid catalyst; biomass; hydrothermal carbonization; esterification; Box-Behnken design
Depositing User : Jane Hindle
Date Deposited : 06 Oct 2017 07:46
Last Modified : 13 Oct 2017 09:29
URI: http://epubs.surrey.ac.uk/id/eprint/842485

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