Reforming Of Aviation Kerosene For Hydrogen Production Catalyzed By Ordered Ni-based Catalysts

Environmental problems and energy shortages caused by excessive use of fossil fuels have become the two major problems humanity facing. As an important raw material of chemical industry, hydrogen is the future ideal alternative of fossil fuels. Aviation kerosene is one of the main fuels for the spacecraft, which has lower prices, convenient transportation and security, so kerosene is the ideal raw material for hydrogen production. In addition, converting kerosene into hydrogen under proper conditions can not only improve its calorific value, enhance the efficiency of the engine, but also be able to solve the environmental problem caused by COx, NOx, greenhouse gases and pollution air released by burning of kerosene.NiFe catalysts supported on Al2O3 were prepared by coprecipitation for steam reforming of kerosene to produce hydrogen. All theses catalysts were tested in a fixed-bed reactor under different conditions. The catalysts obtained under different preparation conditions (calcination temperature and amount of PVP) and different reaction temperatures were characterized by TG-DTG-SDTA, XRD, SEM and BET techniques respectively. The influence of the addition of promoter of ferrous on the activity and stability of catalysts for steam reforming of kerosene to hydrogen production was also investigated in our current work. The experimental results indicate that the calcination temperature has much more influence on catalyst activity. The mesoporous of catalysts elongated its catalytic life for steam reforming of kerosene. Fe addition can improve the CO2/CO in production. The catalyst calcinated at the temperature of 773K is the optimal catalyst. Under the condition of 773K of calcination temperature and 3500 h-1 of space velocity, the catalyst has the optimal reaction activity and stability at the reaction temperature of 773K and 8:1 of H2O/C, and at same time has a good resistance to coke deposition.Mesoporousγ-Al2O3 as catalyst carrier was prepared by deposition method added surfactant polyvinylpyrrolidone (PVP) as additive. NiM-Pd/Al2O3 (M=La, Ce, Nd), NiM/Al2O3,NiPd/Al2O3 catalysts were prepared by equal volume impregnation, and characterized by N2 adsorption, XRD, SEM and TG. All these catalysts for steam reforming of kerosene were tested in a fixed-bed reactor under different conditions. The results demonstrate that adding an appropriate amount of PVP during the preparation of the carrier can enhance the surface area, narrowing pore size distribution of mesoporous Al2O3 carrier. Prepared on this vector kerosene reforming catalysts had good carbon deposition resistance performance. La can improve the performance of the catalyst resistance to carbon deposition which is an appropriate NiPd/Al2O3 catalyst additive. Under conditions of the reaction temperature is 773K, space velocity of 3500h-1 and H2O/C= 8:1, NiLa-Pd/Al2O3-p has the best catalytic activity and stability, and has no obvious deactivation after 50h.