Experimental Study On Catalytic Performance Of Copper Slag Catalyst For Oxygen Production By Bio - Oil

In recent years, due to the gradual exploitation of fossil energy, which caused resource depletion and environmental protection more serious, therefore, the development of renewable clean energy had been closely watched. As the fourth biomass energy after coal, petroleum and natural gas, which attracted more and more researchers’ attention for its low sulfur and zero carbon emissions. As a biomass energy source,because of its high density, the advantages of convenient transportation and easy to store, jatropha oil gradually towards the direction of industrialization.At present, jatropha oil methyl preparation of biodiesel and alternative petrochemical diesel used in smelting furnace as fuel and carbonaceous reductant were the main research hotspot, but the study of gasification was less.As a by-product of copper smelting, a large number of valuable metals and waste heat in copper slag didn’t get good use. In view of this, in this paper through copper slag catalytic jatropha oil steam reforming for hydrogen to achieve efficient use of renewable resources, which is a great significance to save resources and protect environment.Firstly using thermal gravimetric analysis the pyrolysis process of jatropha oil, Combined with TG/DTG curves jatropha oil, dynamic analysis of jatropha oil pyrolysis process was analyzed by Coats-Redfern at different heating rates, it was concluded that three-dimensional diffusion model of Z-L-T equation was the most probable mechanism function, Differential form of the function was 3/2 integral form was [(1-α)-1/3-1]2, calculating that activation energy of jatropha oil pyrolysis stage was about 294.14～349.47 kJ/mol.Secondly copper slag catalytic steam reforming jatropha oil for hydrogen production was studied in a fixed bed reactor. The optimal reaction conditions were as followed:the reaction temperature was 1050℃, the weight hourly space velocity of jatropha oil (WHSV) was 4.3h-1, the steam to carbon ratio (S/C) was 3.5, the quality of catalyst was 0.5g, the selectivity of carbon reached 88% and hydrogen yield reached 52.4% at the optimum experimental conditions.Then we verified the catalytic activity of copper slag components, for the main compositions of copper slag was fayalite (Fe2SiO4), after calcinations the main compositions of copper slag were ferric oxide and silicon dioxide, compared with catalytic activity of copper slag, calcined copper slag and iron oxide catalysts catalytic steam reforming jatropha oil. At the same reaction conditions, the hydrogen yield of copper slag, calcined copper slag and iron oxide catalytic jatropha oil steam reforming were 21.5%, 34.2% and 21.5%, respectively. catalysts were characterized by BET、SEM、TEM/EDS、 XRD、H2-TPR techniques. Because calcined copper slag contained higher dispersion of catalytically active sites and less likely to inactivate compared to iron oxide, at the same weight hourly space velocity the effect of calcined copper slag catalytic bio-oil steam reforming was better for a long time experiment. The yield of hydrogen increased from 32.7% to 37.8%, while the yield of hydrogen dropped from 40.2% to 36.8% when iron oxide catalytic bio-oil steam reforming.At last the process of carbon deposit and composition of liquid product were analyzed when copper slag catalytic jatropha oil steam reforming.It had been discovered the main process of carbon deposit was organic matter or carbon-containing gas pyrolysis, water gas reaction was mainly carbon elimination process, carbon deposit and carbon elimination existed at the same time in the process of catalytic steam reforming, which was a complex competition process.Liquid products were analyzed by infrared to study the change of functional groups at different reaction temperatures, the pyrolysis of jatropha oil did not occur when reaction temperature was below 300℃;when reaction temperature was 300～400℃, ketone group (RCOR’), aldehyde(CHO) and carboxyl group (COOH) were generated by ester base (R1COOR2) broken chemical bonds; when reaction temperature was 400～500℃, ketone group (RCOR’), aldehyde(CHO) and carboxyl group (COOH) broken chemical bonds; When the reaction temperature was greater than 500 ℃, all thefunctional groups broken chemical bonds and generated small molecules gas.In this paper, through the experimental study and theoretical analysis of copper slag catalytic jatropha oil steam reforming, which determined the cracking mechanism of jatropha oil, the catalytic activity and optimal process conditions when copper slag catalytic jatropha oil, which provided certain theoretical guidance for the industrialization of copper slag catalytic jatropha oil steam reforming.