Add time:07/18/2019 Source:sciencedirect.com
Deoxygenation of methyl laurate was carried out over potassium FAU zeolites. The influence of the silicon/aluminum molar ratio was studied using K-USY (3.2), KNaY (2.6) and KNaX (1.1). Decreasing the Si/Al ratio increases the basicity of the zeolite, which improved the deoxygenation capacity by decarboxylation/decarbonylation of the methyl laurate. The use of methanol as solvent it is necessary to avoid the transesterification or the hydrolysis of the methyl ester, as well as to produce hydrogen in situ increasing the formation of dodecane. Potassium X zeolite (K-KNaX) showed a steady catalytic activity with the time on stream over 40% with yield to bio-hydrocarbons C10 to C12 of 30% and reaching selectivity of 70%. The biofuel produced reduced the viscosity 25% and improved the heat value 2500 kJ/kg respect to the initial methyl laurate. Therefore, it is possible to upgrade of the biodiesel by thermocatalytic processes using potassium X zeolites.
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