Biodiesel production from waste frying oil using molybdenum over niobia as heterogeneous acid catalyst: Process optimization and kinetics study

Vitor Lima de Brito, Matheus Arrais Gonçalves, Hiarla Cristina Lima dos Santos, Geraldo Narciso da Rocha Filho and Leyvison Rafael Vieira da Conceição

Renewable Energy, 2023, vol. 215, issue C

Abstract: In this study, a new acid solid catalyst composed of MoO3 impregnated in Nb2O5 was synthesized and applied in methylic transesterification reaction of Waste Frying Oil (WFO) for biodiesel production. The catalyst was synthesized by the wet impregnation method and characterized by Surface Acidity, X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersion X-Ray Spectroscopy (EDS). The transesterification reaction variables were studied using the One Variable at Time (OVAT) technique at the following intervals: temperature (100–160 °C), reaction time (1–3 h), methanol:oil molar ratio (10:1–30:1) and catalyst loading (2–10 wt%). From the results of the catalytic tests, a maximum conversion value of 94.2% was obtained for esters in the following optimized reaction conditions: 145 °C temperature, 2.5 h reaction time, 20:1 methanol:oil molar ratio and 6 wt% catalyst loading. The catalyst was recovered and showed high reusability and stability over eight reaction cycles, with ester content above 80% after seven cycles. Through the kinetic study the activation energy (Ea) and the thermodynamic parameters ΔH#, ΔS# and ΔG# were evaluated following a pseudo first order reaction and their values were 32.00 kJ mol−1, 28.66 kJ mol−1, -0.21 kJ mol−1 K−1 and 118.02 kJ mol−1, respectively.

Keywords: Biodiesel; Solid acid catalyst; Niobium oxide; Molybdenum oxide; Transesterification reaction (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148123008534
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:215:y:2023:i:c:s0960148123008534

DOI: 10.1016/j.renene.2023.118947

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().