| With the rapid development of the world economy and the promotion of sustainable development strategies,avation transportion is playing an vital part in economic structure,environment and energy security.However,there are significant difference between aviation fuel and ground transportation fuel,and options in new fuel for aviation are few.Solar energy,fuel cells and other kinds of energy sources for land transportation are difficult to apply to aircraft in a short period of time.The second-generation biofuel technology for the preparation of aviation kerosene using animal and vegetable oils or agricultural and forestry wastes is environmentally friendly,and products are close to the fossil aviation coal,which can directly replace traditional aviation kerosene to some extent.It is urgent to prepare multifunctional catalysts with function of hydrodeoxygenation and aromatization to catalyze the production of bio-based aviation jet fuels.In this paper,the catalyst carrier Zr-SBA-15 was prepared by hydrothermal synthesis.The active component was supported by equal volume impregnation method and a new multifunctional catalyst system Ni2P/Zr-SBA-15 was synthesized by hydrogen temperature reduction.Three preparation parameters(n(Si)/n(Zr),Ni loading and reduction temperature)were selected during the catalyst preparation to research its effect on catalyst performance.The catalysts were characterized by XRD,TEM,H2-TPR,Py-IR,XPS,SEM,etc,results showed that the highly dispersed,high specific surface,large pore size Ni2P/Zr-SBA-15 catalysts were successfully prepared.The performance evaluation of the catalyst was completed in a high-pressure magnetic stirring reactor,and hydrogenation reaction of the jatropha oil was carried out under certain conditions,and the obtained product oil was analyzed by GC-MS.The results indicated that the optimum preparation parameters were n(Si)/n(Zr)=10,the reduction temperature was 800?,and the Ni loading was 30 wt%.The results show that the product oil consists of a large number of paraffinic hydrocarbons,some of the cycloalkanes,olefins,aromatics and a small amounts of oxygenates.The versatility of the catalyst includes excellent deoxidation performance(combined deoxidation rate as high as 98.14%),special cyclization,aromatization activity and cracking properties.The product oil has excellent aviation kerosene component,the yield of No.3 jet fuel is 28 wt%,and the volatility meets the technical requirements(No.3 jet fuel 1 GB 6537-2006).The C8-C16 component of jet fuel composition accounts for more than 60 wt%,the main component is linear paraffin,the content is 79.25 wt%,and the naphthene is 6.72 wt%.Excellent combustion performance and low freezing point are guaranteed.O,S,N and other harmful elements are 0,no metal elements.The aromatic hydrocarbon compound accounts for 10.13 wt%(all composed of monocyclic aromatic hydrocarbons),which prevents shrinkage of the sealing member and causes leakage and increases oil density.Monocyclic aromatic hydrocarbons can ensure a higher smoke point.The balance is a small amount of olefins and isoparaffins.The composition meets the detailed requirements of aviation turbine fuels containing synthetic hydrocarbons in ASTM-D7566-2017b,and the oil density is as high as 811?835 Kg/m3.This product breaks through the limitations of the previous bio-coal coal in terms of density and aromatics content,and no longer needs to be blended with petroleum-based aviation coal.Achieving a true one-step hydrogenation process to prepare high-quality jet fuel components has brought hope to the replacement of fossil-based jet fuel by 100%bio-jet fuel.However,it is necessary to further conduct comprehensive testing on the physical and chemical indicators of the product. |
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