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Biodiesel synthesis and kinetic analysis based on MnCO3/Na silicate as heterogeneous catalyst

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2018
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Authors
Zhang, Yanan
Liu, Hui
Zhu, Xiaochan
Lukić, Ivana
Zdujić, Miodrag
Shen, Xiang
Skala, Dejan
Article (Published version)
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Abstract
Тhe MnCO3/Na silicate (Mn/Na/Si mole ratio of 4.65:1:1.65) catalyst in the form of solid particles with diameter of 0.99–1.99 mm was used as a catalyst for transesterification of soybean oil in batch autoclave at different conditions: 388–468 K, methanol-to-oil mole ratio 12:1–30:1, catalyst amount based on the mass of oil 0–12.5 %. The complete triacylglycerols (TAG) conversion and high yield of fatty acid methyl ester (FAME) was obtained after 1 h at 458 K, methanol-to-oil mole ratio 30:1 and 10 % of catalyst. Kinetics of transesterification process was analyzed by three models: the simple first order irreversible reaction rate, as well as two more complex models recently reported in literature. The catalyst reuse in transesterification process was tested and the average values of 99.0 % of TAG conversion and 97.5 % of FAME yield were obtained after 8 consecutive runs. Different techniques were used to characterize fresh and used MnCO3/Na silicate catalyst. The determined amounts of ...leached Na (<500 ppm) and Mn (<20 ppm) in biodiesel phase implied that the homogeneous-heterogeneous process influences the catalyst selectivity, whereby leached Na enables the complete transformation of TAG to FAME.

Keywords:
kinetics / MnCO3/Na-silicate / reusability / transesterification
Source:
Journal of the Serbian Chemical Society, 2018, 83, 3, 345-365
Publisher:
  • Belgrade : Serbian Chemical Society
Projects:
  • International S&T Cooperation Program of China, Grant No. 2013DFG92250
  • Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)

DOI: 10.2298/JSC170612005Z

ISSN: 0352-5139

WoS: 000429093200007

Scopus: 2-s2.0-85045011341
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URI
http://dais.sanu.ac.rs/123456789/3751
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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