PREPARATION AND APPLICATION OF KF/EGGSHELL CATALYST IN TRANSESTERIFICATION OF NEEM OIL: OVAT APPROACH

  • O.A Ajayi
  • S.A Oladipo
  • S.S Ogunyemi
  • Y Nurudeen
  • Y.A Atta
Keywords: Biodiesel, Transesterification, Waste Eggshell, Neem oil

Abstract

A solid base KF/Eggshell catalyst was prepared by wet impregnation method and applied for
biodiesel production from high FFA neem oil. The XRF and XRD analyses confirmed the presence of
CaO in the eggshell and crystalline phases of the desired catalyst. The 79 nm sized crystallites of the
best catalyst having hexagonal shapes determined by SEM images were systemically arranged to give
a BET specific surface area of 128 m2/g, pore size 3.24nm and pore volume0.045 cm3/g. The
parameters affecting the preparation of the catalyst were investigated using OVAT approach. The best
synthesis conditions were found to be 9000C eggshell calcination temperature for 2h, 30 wt. % KF
dosage, and 6000C KF/Eggshell post-impregnation calcination temperature for 3h. The catalyst was
applied in a single stage transesterification of neem oil having FFA of 4.2% to produce 94.8% yield of
biodiesel. The biodiesel produced was confirmed using FTIR and GC-MS and comparable to the
ASTM commercial standard. The reusability test shows that the catalyst was active recording high
yield of 90% even after the fifth run and more efficient than KF/commercial CaO. Accordingly,
eggshell can serve as a very good source of CaO for catalysing biodiesel formation.

Author Biographies

O.A Ajayi

Department of Chemical Engineering, Ahmadu Bello University, Zaria

S.A Oladipo

Department of Chemical Engineering, Ahmadu Bello University, Zaria

S.S Ogunyemi

Department of Chemical Engineering, Ahmadu Bello University, Zaria

Y Nurudeen

Department of Chemical Engineering, Bayero University, Kano

Y.A Atta

National Research Institute for Chemical Technology, Zaria

Published
2019-06-21