Decarboxylation Of Biodiesel To Produce Hydrocarbon Fuel By Multi-Phase Catalyzation

performance of activated carbon with94.26%conversion of fatty acid methyl ester and45.20%yield of liquid hydrocarbon was achieved when it modified by1mol/LKOH.(2) Activated carbon was modified by loading the oxidation state or the reduced state of Ni or Mo, and the performance of modified activated carbon on catalytic decarboxylation of biodiesel was investigated. It was found that the catalytic decarboxylation performance of the reduced state of Mo was higher than the reduced state of Ni. MoO3was superior to NiO and the reduced state of Mo was higher than MoO3. Furthermore,99.21%conversion of biodiesel and48.53%yield of liquid hydrocarbon was achieved when the reduced Mo was supported on activate carbon.(3) The supported Mo/C was selected to catalyze the decarboxylation of Biodiesel. The effects of reaction temperature, feeding rate, catalyst amount and transition metal loading rate were investigated. With the increased of reaction temperature, the conversion of biodiesel increased, the yield of liquid hydrocarbon increased and then decreased, reached the maximum at340℃. Feeding rate and catalyst amount can affect the residence time of the reactants in the catalyst bed, thus affect catalytic decarboxylation. Conversion of biodiesel and yield of liquid hydrocarbon were both gradually reduced as the feeding rate increased. With the increased of catalyst amount, the conversion of biodiesel increased, the yield of liquid hydrocarbon increased and then decreased, reached the maximum value at40g. With the increased of metal loading rate, the yield of liquid hydrocarbon increased, the conversion of biodiesel maintained at about90%. The optimal process conditions were achieved with reaction temperature of340℃, feeding rate of0.3258g/min, catalyst amount of40g and metal loading rate of40wt%. Under the optimal conditions, the conversion of biodiesel was over99%and the yield of liquid hydrocarbon was62.35%. Compared to biodiesel, the performance of the achieved liquid hydrocarbon, such as the heating value, the oxidation stability and the low temperature fluidity was greatly improved. The heating value increased from39307kJ/kg to43130kJ/kg, the induction time increased from0.29h to1.55h and the cryoscopic decreased from2℃to-20℃.(4) The deoxygenation route of biodiesel on Mo/C catalyst was summarized through referring other scholar’s research and comparing the composition distribution between reactant and products. Deoxygenation of biodiesel was mainly via decarboxylation/decarbonylation, followed by cracking and accompanied with the reaction of dehydrogenation-polymerization, dehydrogenation-aromatized and hydrogenation.(5) The lifetime of Mo/C catalyst was investigated under optimal conditions and the reason of catalyst deactivation was also analyzed. It was found that the catalytic activity of the catalyst can be maintained at a high level in the first three hours, then gradually decreased with the reaction going, and finally lost catalytic activity at13h.