Catalytic Preparation Of Bio-aviation Kerosene By One-step Hydrogenation Of Jatropha Oil

In order to solve the problem of energy depletion and greenhouse effect brought by the rapid development of air transport industry,bio-aviation fuel with one-step hydrogenation of animal and vegetable oils as raw materials is one of the most potential solutions.First,the influence of reaction conditions on the catalytic hydrogenation of the fixed bed was investigated in this paper.And the optimum reaction conditions of the catalytic hydrogenation were preliminarily determined.The participation of bifunctional catalysts with high deoxidation and catalytic cracking isomerization performance and selection of optimum reaction conditions is the key for the preparation of bio-aviation coal by one-step hydrogenation of fats and oils.Therefore,25 kinds of catalysts were prepared by modifying the original catalyst,and under the optimum reaction conditions,used those catalysts to catalyzed jatropha oil.Finally,two catalysts with better catalytic performance were selected:Pt/SAPO-11-mp catalyst that prepared by modifying of the metal promoter,and Pt/SAPO-11-dp catalyst that prepared by modifying of the dispersant.On the basis of the selected catalysts,the effects of reaction temperature,reaction pressure,space velocity and hydrogen/oil ratio on the catalytic reaction process and product composition were investigated.The results showed that Pt/SAPO-11-dp catalyst catalytic jatropha oil at the best conditions: reaction temperature was 400 ℃,reaction pressure was 5 MPa,space velocity was 1.2 h^-1,hydrogen and oil ratio was 1000,and the product deoxidation rate of 99.45%,C₈-C₁₆ ratio of 58.74%,C₈-C₁₆ hydrocarbon isomerism rate of 25.18%;Pt/SAPO-11-mp catalyst catalytic jatropha oil at the best conditions: reaction temperature was 400 ℃,reaction pressure was 4 MPa,space velocity was 1.2 h^-1,hydrogen and oil ratio was1000,and the product deoxidation rate of 99.24%,C₈-C₁₆ ratio of 71.16%,C₈-C₁₆ hydrocarbon isomerism rate of 37.92%.The possible reaction pathways of jatropha oil by one-step hydrogenation were preliminarily that estimated according to the influence of reaction conditions on the distribution of product components and thedecarboxylation / decarbonylation and hydrodeoxygenation of jatropha oil.At the end of this paper,the physical and chemical properties of the product were tested.The results showed that the density,copper corrosion,kinematic viscosity,freezing point,total acid value and total calorific value of the product all met the requirements of No.3 jet fuel.From the above results,it can be seen that catalytic hydrogenation of jatropha oil can produce bio-aviation fuel components that can replace fossil fuels,Which provides a theoretical basis for the development of new energy and its application in the aviation field.