Deoxygenation of rapeseed oil over V and Ni supported on Al2O3 promoted by Ce was investigated. The supported catalyst was prepared by incipient wetness impregnation method. The obtained catalyst was characterized using techniques of XRD, BET, NH3 -TPD, H2-TPD and TPR analysis. The results revealed that the catalyst had good thermal stability and three kinds of acidities sites. Compared with sintering, the catalyst deactivation was due to coke deposition. The results of FT-IR, SF-3, GC and GC-MS indicated that reaction temperature is the key factor and that oil velocity is very important factor and that reaction pressure is a less important one in producing bio-fuels. The condition was optimized under such circumstances -- reaction temperature at 450°C, reaction pressure at 3.0MPa, oil velocity at 0.1mL/min and the gas velocity at 30mL/min, respectively. The alkanes content and alkenes content of liquid products are 60.03% and 29.44%, respectively, under the optimized condition. The main products are the hydrocarbon compounds under C18. The results of GC and SF-3 showed that the reaction of decarboxylation and decarbonylation occurred at the same time, and that the oxygen in the oil is mainly removed by the forms of CO and CO2, and that small part is removed by the form of H2O. From the results of FT-IR,SF-3 and GC-MS, the generating mechanism of Non- ester renewable diesel was deduced.

Xigen Huang, Zhiping Le and Lin Li