Abstract: A new catalyst x%Ni-y%Nb₂O₅/γ-Al₂O₃(x% is the mass fraction of Ni, x＝1,2,3,4,5; y% is the mass fraction of Nb₂O₅, y＝10,20) was designed, and the effects of Ni and Nb₂O₅ content and reaction conditions on the hydrodeoxygenation of 1,5-bis-(tetrahydrofuranyl)-3-pentanone were investigated. The results showed that under the conditions of reaction temperature 260 ℃, pressure 3 MPa and reaction time 24 h, 4%Ni-20%Nb₂O₅/γ-Al₂O₃ catalyst for 1,5-bis-(tetrahydrofuryl) -3-pentanone hydrodeoxidization to produce long-chain alkanes had the yields of 89.6%, of which the carbon yields of C₁₁ alkanes, C₁₂ alkanes and C₁₃ alkanes were 3.8%, 8.9% and 76.9%, respectively. Meanwhile, 4%Ni-20%Nb₂O₅/γ-Al₂O₃ catalyst had good stability. When the reaction temperature was 260 ℃, the reaction pressure was 3 MPa, the liquid hourly space velocity was 2 h-1, and the volume ratio of hydrogen to oil was 200, the total yield of C₁₁-C₁₃ alkanes could still keep up to 89.5% after 70 h of continuous catalytic reaction.

Key words: biomass, hydrodeoxygenation, catalyst, long-chain alkanes