Upgradation of Light Fraction of Biomass Oil via Catalytic Hydrogenation

The crude biomass oil obtained from rice husks was a complicated mixture with the unstable physic-chemical properties.Only these biomass oils,which were modified,can be used in diesel engine.The refined biomass oil was prepared by the vacuum distillation approach from the crude biomass oil.The refined biomass-oil was upgraded via the catalytic hydrodeoxygenation over MoS2 under different temperatures(150,250,350 and 150/350℃) and 2 MPa.The yields of upgraded oils were calculated,and the properties and nH/nC of oils were also analyzed,which were used to evaluate the upgrading performance.The experimental results showed that the yield of upgraded oil decreased with the temperature rising.The yield of upgraded oil was 80.3% at 150℃,while at 350℃,the yield(65.4%) was lower,but the rate of nH/nC(3.8) was higher.The two-stage reaction at 150/350℃ turned out the better catalytic deoxygenation than those of the one-stage temperature condition.The catalytic hydrodeoxgenation mechanism over MoS2 could be clarified via the unsaturated functional bonds(CC and CO sites) of the components in the refined oil that were easily attacked by the hydrogen during the proper temperature and pressure.