Abstract
ZnFe2O4 nanocatalysts synthesized by microwave combustion method is employed for biodiesel production from waste cooking oil (WCO). The zinc ferrite samples are prepared by varying the microwave power from 500 to 1500 W. The nanocatalysts are characterized by XRD, FTIR, DRS, HR-SEM and VSM techniques. Transesterification of WCO are investigated and maximum biodiesel yield of 98.6% is achieved with 4 wt% of ZnFe2O4 nanocatalyst (ZF-1500 sample), methanol/oil molar ratio of 21:1, reaction temperature about 60 °C and reaction time 1 h. The nanocatalyst (ZnFe2O4) was reused at least for 10 times. The activation energy (Ea) and frequency factor (A) is calculated to be 59.4 kJ mol−1 and 1.66 × 108 min−1 respectively. The thermodynamic parameters ∆H and ∆S were found to be 88.76 kJ mol−1 and − 0.096 kJ mol−1 K−1. The positive values of ∆G for transesterification process is found to be non-spontaneous and endergonic.
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Abbreviations
- WCO:
-
Waste cooking oil
- ZF-500:
-
Zinc ferrite using 500 W
- ZF-600:
-
Zinc ferrite using 600 W
- ZF-900:
-
Zinc ferrite using 900 W
- ZF-1200:
-
Zinc ferrite using 1200 W
- ZF-1500:
-
Zinc ferrite using 1500 W
- XRD:
-
X-ray diffraction
- FTIR:
-
Fourier transformed infrared
- HRSEM:
-
High resolution scanning electron microscopy
- DRS:
-
Diffuse reflectance spectroscopy
- VSM:
-
Vibrating sample magnetometer
- GCMS:
-
Gas chromatography mass spectroscopy
- FAME:
-
Fatty acid methyl ester
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All the authors sincerely thank VIT Chennai Campus, Chennai, Tamil Nadu, India, for providing financial assistance through research associateship to the first author.
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Ashok, A., Kennedy, L.J. Magnetically Separable Zinc Ferrite Nanocatalyst for an Effective Biodiesel Production from Waste Cooking Oil. Catal Lett 149, 3525–3542 (2019). https://doi.org/10.1007/s10562-019-02906-4
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DOI: https://doi.org/10.1007/s10562-019-02906-4