TITLE:
Deactivation Processes, Regeneration Conditions and Reusability Performance of CaO or MgO Based Catalysts Used for Biodiesel Production—A Review
AUTHORS:
Nombamba Oueda, Yvonne L. Bonzi-Coulibaly, Igor W. K. Ouédraogo
KEYWORDS:
Deactivation, Recycling, Metal Oxides Catalyst, Transesterification, Biodiesel
JOURNAL NAME:
Materials Sciences and Applications,
Vol.8 No.1,
January
11,
2017
ABSTRACT: The activity of a catalyst in transestrification reaction usually declines with
repeated uses and this limits the possibility to use it many times. This paper
presents a review of various techniques used to evaluate the activity changes,
the recycling processes for calcium and magnesium oxides based heterogeneous
catalysts for biodiesel production. The activity of calcium and magnesium
oxides based catalysts declines due to leaching, surface or active sites
poisoning by reactant or product molecules and modification of physical
aspects. Physico-chemical methods (AAS,
BET, CO2-TPD, EDS, FTIR, ICP-AES, SEM, TG/DTA and XRD were used to check the catalyst modification and to confirm the
deactivation. When separated from the reaction mixture by filtration, the
catalyst could be reused without any treatment or recycled by washing, drying
or/and recalcination. Between various recycling processes for calcium and
magnesium oxides based catalysts, mixed oxides showed less leaching and
performed FAME or FAEE yield >90% with reusability.