Study On Hydrogen Production By Catalytic Reforming Of Bio-oil & Methanol Over Ni Catalysts

Hydrogen is not only an important chemical raw material, but also an energy carrier. Hydrogen is considered the most development potential clean energy sources in the 21st century. Currently, hydrogen production mainly depends on the conversion of petrochemical raw materials, such a process causes great pollution to the environment, and accelerates the depletion of fossil fuels. In the dual pressures of environ-mental pollution and energy crisis, people eager to search for recycling, pollution-free hydrogen production methods.As a clean renewable energy, biomass will play a more and more important role in the future. And it is also of great practical significance to the development of low carbon technology. Among varietal biomass energy application ways, hydrogen production by catalytic reforming of biomass pyrolysis liquid has become a hot research point and focus.Firstly, bio-oil was produced through fast pyrolysis of biomass under laboratory-developed system, in which physical properties such as water content, calorific value, viscosity, pH value, etc., are studied. The chemical composition of bio-oil was analyzed by GC-MS. The results show that the first grade bio-oil obtained through the grading system has a complex composition with a moisture content of 24.21%, which is suitable for extraction of high value-added chemicals or a high quality high-grade fuel after modification; and the second, third, fourth hybrid bio-oil with a simple composition consisting of moisture content of 55.54%, is more suitable for catalytic reforming.Hydrogen production by catalytic reforming of bio-oil & methanol over nickel catalysts is studied in this thesis. A commercial catalyst ICI46-1 was selected for catalytic conversion of bio-oil, an orthogonal experiment was used in the fixed micro-reactor to systematically examine the effect of various reaction parameters, such as the ratio of bio-oil and methanol mixture, reaction temperature, steam carbon ratio, and sample flow rate. Such a text can optimize conditions and hence, established a popular method for evaluating the performance of catalysts. Forsterite was chose as the catalysts'carrier, CeC2, MgO as additives according to results of previous studies, and the properties of a laboratory-made nickel-based catalyst uesd were investigated.The results show that hydrogen production by catalytic reforming of mixed samples of bio-oil-methanol not only improves the hydrogen yield and carbon conversion, but also reduces obviously the catalyst carbon deposition, and therefore effectively improves the catalyst activity and stability. The results of orthogonal test show that the optimum mixing mass ratio of methanol and bio-oil is 50%:50%, hydrogen yield and carbon conversion rate was 34.66% and 63.02%, respectively by using ICI46-1. The effect of catalytic reforming with a synthesis catalyst of 6% Ni-3% Ce-1% Mg/olivine improved in comparison with ICI46-1, where the carbon conversion and hydrogen yield is relatively increased, respectively in the same conditions. And under optimum conditions, the carbon conversion and hydrogen production rates were 68.29% and 38.52%, respectively.