Green Synthesis, Characterization and Test of MnO2 Nanoparticles as Catalyst in Biofuel Production from Grape Residue and Seeds Oil

  • Adina Stegarescu
  • Ildiko Lung
  • Cristian Leoștean
  • Irina Kacso
  • Ocsana Opriș
  • Mihaela Diana Lazăr
  • Lucian Copolovici
  • Simona Guțoiu
  • Manuela Stan
  • Adriana Popa
  • Ovidiu Pană
  • Alin Sebastian Porav
  • Maria-Loredana SoranEmail author
Original Paper



The MnO2 nanoparticles, when used as catalyst, determine an enhanced reaction rate of the transesterifications process thus being very attractive for biodiesel production. One of the current limitations of the biofuel production by using MnO2 nanoparticles as catalyst is given by the reaction conditions. This work intends to improve the transesterification reaction efficiency through the use of a microwave field. It can generate large quantities of energy that lead to a good molecular motion thus favoring the transesterification process without altering the molecular structure. The aim of the present research is to explore the possibility of carrying out the microwave-assisted transesterification of grapes residues and seeds oil through the use of MnO2 nanoparticles as catalysts, as well as yeast (Saccharomyces cerevisiae), to efficiently obtain biofuel end product.


Both chemically and biochemically (using plant extracts) synthesized MnO2 nanoparticles were produced and characterized by different techniques like TEM, XRD, BET, XPS, VSM. The analysis of obtained biofuel was performed by GC–MS.


The comparison of results revealed that the samples prepared using plant extracts have morphologic properties higher than chemically prepared sample. MnO2 nanoparticles obtained by the use of oregano extracts were further tested for microwave assisted transesterification studies.


The surface area of the MnO2 nanoparticles biochemically synthesized was four times higher than the nanoparticles synthesized by chemical method. The MnO2-oregano nanoparticles presented the best catalytic activity for biodiesel production as compared to the yeast catalyst. The use of microwave field for transesterification further enhances the efficiency of the process.

Graphic Abstract


Manganese dioxide Nanoparticles Plant extracts Catalyst Biofuel 



This work was supported by the Romanian Ministry of Education and Research within the Nucleu Programme (Project PN16-30–02-05) and co-funded by the European Commission through European Regional Development Fund Structural Operational Program “Increasing of Economic Competitiveness” Priority axis 2, operation 2.1.2. Contract Number 621/2014.

Compliance with Ethical Standards

Conflict of interest

There are no conflicts of interest to declare.


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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Adina Stegarescu
    • 1
  • Ildiko Lung
    • 1
  • Cristian Leoștean
    • 1
  • Irina Kacso
    • 1
  • Ocsana Opriș
    • 1
  • Mihaela Diana Lazăr
    • 1
  • Lucian Copolovici
    • 2
  • Simona Guțoiu
    • 1
  • Manuela Stan
    • 1
  • Adriana Popa
    • 1
  • Ovidiu Pană
    • 1
  • Alin Sebastian Porav
    • 1
  • Maria-Loredana Soran
    • 1
    Email author
  1. 1.National Institute for Research and Development of Isotopic and Molecular TechnologiesCluj-NapocaRomania
  2. 2.Research Center of Natural and Technical Sciences“Aurel Vlaicu” UniversityAradRomania

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