Study On Oligomerization And Hydrodeoxygenation Of Bio Based 2-methylfuran

Liquid fuel,such as gasoline and diesel,is the main fuel for transportation,and also the energy source of a series of important military weapons and equipment.The synthesis of liquid fuels that meet the specific conditions and engine use,and the realization of customized fuel on demand have become a major demand for the development of liquid fuels.Biomass is not only an important renewable carbon resource,but also has outstanding potential to synthesize high-performance liquid fuels due to the module stacking mechanism in the process of biofuel synthesis.In this paper,2-methylfuran,an important bio based platform compound,was used as the starting material to explore the catalytic reaction process of 2-methylfuran controlled oligomerization.Under the guidance of reaction mechanism,solid acid catalysts were constructed to further study the hydrodeoxygenation process of oligomerization products.Through the fine regulation of acid and metal,the complete deoxygenation was achieved while the carbon skeleton of precursor was retained to the maximum extent,and the catalytic activity was improved.The properties of the obtained fuel are comprehensively evaluated and the combustion properties are preliminarily explored.In order to solve the serious corrosion problem of liquid acid catalyst in 2-methylfuran trimerization process,a highly efficient and reusable solid acid catalyst was developed.Under the same conditions as concentrated sulfuric acid catalyst system,85%conversion of 2-methylfuran and 99%selectivity of aviation fuel precursor(5,5-bis(5-methylfuran-2-yl)pentan-2-one,BMPFO)were obtained.Furthermore,the hydrodeoxygenation process of BMPFO catalyst was optimized.It was found that the activity of common hydrogenation catalysts such as Pt/Al2O3 catalyst was too strong in this process,which led to the fracture and reorganization of the framework.Guided by the idea of reducing the acidity of the support,the physical mixed catalyst of Pt/C and Pt/TiO2 was selected as BMPFO hydrodeoxygenation catalyst.Under the optimized conditions,the selectivity of C10-C15 was up to 95%,and the selectivity of C10-C15 was avoided It avoids the formation of aromatic hydrocarbons.The solidification point,viscosity and calorific value of the crude fuel obtained in the experiment were-52.0?,0.3294 MPa·s and 45.17 MJ/kg respectively.The combustion performance of the fuel was evaluated by synchrotron radiation,and it was proved that no coke precursors such as aromatic hydrocarbons were produced in the combustion process of the fuel.Considering its outstanding low freezing point characteristics,the application of the fuel doped with biodiesel is further evaluated,and it is found that it can effectively reduce the freezing point of biodiesel.Through the collaborative innovation of catalyst and process,the controllable trimerization and hydrodeoxygenation of 2-methylfuran were successfully realized,and the aviation fuel with excellent properties in freezing point,viscosity and combustion characteristics was synthesized,which laid the foundation for further exploration of its high value application.