Fuel Processing Technology, Vol.171, 20-30, 2018
Green diesel production via continuous hydrotreatment of triglycerides over mesostructured gamma-alumina supported NiMo/CoMo catalysts
In the present study, the deoxygenation of canola oil was performed in a continuous fix-bed reactor. Wormhole like mesostructured gamma-alumina with nano-sized crystalline domains and pores in the range of 8 nm was one-pot synthesized using polymeric template assisted sol-gel method via evaporation-induced self-assembly (EISA). Nanoporous catalysts were prepared by employing the incipient wetness co-impregnation method followed by a calcination step, 15 wt% MoO3 and 3 wt% NiO or CoO, were impregnated on the nanoporous support. Both catalysts favored the hydrodeoxygenation reaction pathway, and the liquid hydrocarbons consisted mostly of C15-C18 n-alkanes. The effects of LHSV and temperature on the liquid product composition were investigated in the range of, LHSV: 1 to 3 h(-1), and temperature of 325 to 400 degrees C while keeping other reaction conditions constant at a pressure of 450 psi and H-2/oil of 600 mL mL(-1). Slightly better catalytic activity was perceived for NiMo-S/gamma-alumina at higher LHSV compared to CoMo-S gamma-alumina catalyst. The liquid conversion on NiMo-S/gamma-alumina is higher than that on CoMo-S/gamma-alumina over the temperature range of 325 to 350 degrees C. At 375 degrees C, the conversion reached 100% over both catalysts. The production of green diesel range liquid products over NiMo-S/gamma-alumina and CoMo-S/gamma-alumina was found optimal at 325 degrees C and 1 h(-1) LHSV.
Keywords:Green diesel;Triglycerides hydrotreatment;Mesostructured gamma-alumina;NiMo/gamma-alumina;CoMo/gamma-alumina