Biodiesel production using layered double hidroxides and derived mixed oxides: The role of the synthesis conditions and the catalysts properties on biodiesel conversion

The present study evaluated biodiesel production using Layered Double Hydroxides (LDHs) and derived mixed oxides as heterogeneous catalysts to analyse the relation between the physicochemical and textural properties of these materials with biodiesel yield. Experimental planning was conducted to eval...

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Bibliographic Details
Published in:Fuel (Guildford) 2019-09, Vol.251, p.285-292
Main Authors: Reyna-Villanueva, L.R., M. Dias, J., Medellín-Castillo, N.A., Ocampo-Pérez, R., Martínez-Rosales, J.M., Peñaflor-Galindo, T., Alvarez Fuentes, G.
Format: Article
Language:English
Subjects:
Aluminum
Ammonia
Biodiesel
Biodiesel fuels
Biofuels
Catalysis
Catalysts
Catalytic activity
Chemical reactions
Chemical synthesis
Conversion
Diesel
Experimental planning
Fourier transforms
Heterogeneous catalysts
Hydroxides
Infrared spectra
Layered Double Hydroxides
Magnesium
Methanol
Mixed oxides
Organic chemistry
Oxides
Roasting
Scanning electron microscopy
Sodium carbonate
X-ray diffraction
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Summary:The present study evaluated biodiesel production using Layered Double Hydroxides (LDHs) and derived mixed oxides as heterogeneous catalysts to analyse the relation between the physicochemical and textural properties of these materials with biodiesel yield. Experimental planning was conducted to evaluate the effect of different Mg/Al molar ratios, precipitating agents (Na2CO3 or NH3) and calcination effect on methyl ester yield. Materials were characterized by X-ray diffraction (XRD), N2-BET method, fourier-transform infrared spectra (FT-IR), point of zero charge (pHPZC) and scanning electron microscope (SEM). Biodiesel synthesis was further optimized through experimental planning considering the catalyst concentration and methanol:oil molar ratio at 4 periods of time as variables, using the material which exhibited the best performance. The material with best catalytic activity was a derived mixed oxide (calcined at 450 °C) with a Mg/Al ratio of x = 0.59, using Na2CO3 as precipitating agent. The optimized parameters for the chemical reaction were: 23:1 methanol:oil molar ratio, 3.5 wt% catalyst at 65 °C for 1 h, resulting in a maximum ester conversion of 98.59 wt%.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2019.03.128