Study Of Hydrogen Production By Reforming Of Bio-oil And Its Model Compounds

Hydrogen is a clean and high-efficiency renewable energy, the technology of hydrogen production by bio-oil steam catalytic reforming is one of the ways to mass produce hydrogen by biomass. This technology has good development and utilization potential, and catches many scholars’ attention. Based on the research progress and the insufficiency of this technology, this article mainly studied three aspects: The physical and chemical characteristics of bio-oil; The influence of different reaction conditions on the hydrogen production; Characterization of catalysts in hydrogen product ion.Through the analysis of rice husk pyrolysis oil, it is found that the bio-oil is a dark liquid, which has stimulating smell. According to its elements composition, the chemical formula of this bio-oil can be simplified for CH3O1.5. From the result of GC- MS analyze, the bio-oil mainly consist of Acetic acid, glycol, hydroxyl-acetone, phenol and furfural and so on.Acetic acid, glycol, acetone and phenol were selected as the typical model compound of bio-oil for hydrogen production. This article obtained the influence of weight hourly space velocity(WHSV), water/carbon ratio(S/C) and reaction temperature in the experiment of acetic acid. Finally, WHSV = 5, S/C = 3 and reaction temperature of 800℃ was determined as the experiment condition of bio-oil catalytic reforming hydrogen production. This article use corn stalk ash as carrier to prepare a new nickel-based catalyst, by comparing with the commercial catalyst, found the corn stalk ash catalyst for reforming hydrogen ha d a better result than commercial catalysts. In addition, this article selected acetic acid, glycol, acetone and phenol to carry out the reforming hydrogen production experiments, compared with bio-oil to explore the mechanism of hydrogen production.Do the characteristic of XRF, XRD, S EM, BET and TG for the catalysts. The results showed that the corn stalk ash catalyst contains more Na, Mg, P, K, Ca etc. which have good catalytic effect. In different weight hourly space velocity, water/carbon ratio and model compound, the degree of the reduction of metal oxides in catalyst were similar, but not with the different temperature, the metal oxide of catalyst can hardly be reduction below 700 ℃. The specific surface area, pore volume and pore diameter of the catalyst before and after reaction in different reaction conditions was also obtained. From the SEM images, the catalyst surface covered with fibrous carbon, and the degree of the carbon cover is different under different reaction conditions. This paper also measured the carbon content on the surface of the reforming catalyst after reaction by the Differential Thermal Balance(TG). With the increase of WHSV, residual carbon attached on the catalysts is more and more serious; carbon residue content is the least at the S/C=1 and 5; with the temperature increasing, carbon residue on the catalyst is less and less.