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Microwave-assisted hydrothermal synthesis of sulfonated TiO2-GO core–shell solid spheres as heterogeneous esterification mesoporous catalyst for biodiesel production


Citation

Soltani, Soroush and Khanian, Nasrin and Choong, Thomas Shean Yaw and Asim, Nilofar and Yue, Zhao (2021) Microwave-assisted hydrothermal synthesis of sulfonated TiO2-GO core–shell solid spheres as heterogeneous esterification mesoporous catalyst for biodiesel production. Energy Conversion and Management, 238. art. no. 114165. pp. 1-10. ISSN 0196-8904

Abstract

In accordance with the need for green production, the aim of current research is to synthesize a highly recyclable mesoporous SO3H-GO@TiO2 catalyst possessing both Brönsted and Lewis acid sites for one-pot catalyzing the esterification of inexpensive acidic feedstocks namely palm fatty acid distillate (PFAD), containing free fatty acids (FFAs, >85 wt%) and a considerable amount of water (3 wt%). The mesoporous sulfonated GO@TiO2 catalyst was synthesized using a two-step hydrothermal microwave-assisted method featured by uniform dispersion of TiO2 nanoparticles inside the mesopore framework of GO and post-sulfonation treatment. The effect of different GO:Ti ratios (1:0.1, 1:0.3, 1:0.5, and 1:1) on textural properties were examined and therefore, the ratio of 1:1 was selected as the optimum ratio for further experiments. The mesoporous SO3H-GO@TiO2 catalyst was characterized using Raman spectroscopy, Brunauer–Emmett–Teller (BET), X-Ray diffraction (XRD), temperature-programmed desorption (TPD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray (EDX), and the results revealed that the as-developed catalyst possessed desirable textural properties as well as strong acidity with a combination of both Brönsted and Lewis acid sites. Furthermore, the crystalline structure of the as-prepared mesoporous GO@TiO2 material remains unaltered after the post-sulfonation treatment. In addition, the synthesized mesoporous SO3H-GO@TiO2 catalyst showed high stability for ten consecutive esterification reactions without additional treatments.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1016/j.enconman.2021.114165
Publisher: Elsevier
Keywords: Mesoporous catalyst; Catalyst support; Graphene oxide (GO); Surface functionalization; Palm fatty acid distillate (PFAD); Esterification
Depositing User: Ms. Nur Faseha Mohd Kadim
Date Deposited: 09 May 2023 03:17
Last Modified: 09 May 2023 03:17
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.enconman.2021.114165
URI: http://psasir.upm.edu.my/id/eprint/94193
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