Catalytic Reforming Of Biogenic Oil With Modified Nickel-based Sepiolite Catalyst For Hydrogen Production

Hydrogen energy is recognized as clean energy in the world.The development and utilization of hydrogen energy can reduce the increasingly serious environmental problems and energy crisis problems.Catalytic reforming of bio-oil for hydrogen production is considered to be one of the most promising ways to produce hydrogen in the future.In this paper,the mixture with molar ratio of phenol to ethanol of 1:2 was used as the model compound of biological oil to study the hydrogen production by steam catalytic reforming in a fixed-bed reactor,and the hydrogen production performance of modified nickel-based sepiolite catalyst in catalytic reforming was studied.The optimum reaction conditions of the process were also explored.A series of Ni/La-SEP catalysts were prepared by precipitation method using sepiolite?SEP?as carrier,in which metal La was used as promoter to modify SEP.The properties of the catalysts were characterized by N₂ desorption-adsorption,XRD,H₂-TPR,TEM,XPS and H₂ pulse chemisorption.The catalytic reforming of phenol and ethanol by steam reforming was carried out in a self-made fixed-bed reactor.The effects of catalyst type,S/C and reaction time on hydrogen production by catalytic reforming of bio-oil model were investigated.The results show that the addition of promoter La to the Ni/SEP catalyst can reduce the grain size,increase the metal dispersion,and enhance the redox ability and the interaction between the metal and the support.The experimental results show that the Ni/10La-SEP catalyst exhibits the best activity and good stability under the conditions of 600 ^oC,S/C=1.7 and WHSV=5.4 h^-1,the highest carbon conversion and H₂ yield were 92.1%and 87.6%,respectively,and no inactivation was observed within 50 h.A rare earth metal?La,Ce?modified nickel-based catalyst with a content of 10 wt%by weight was prepared by co-precipitation method.The properties of the catalyst were characterized by XRD,H2-TPR,SEM-EDS and high-power TEM.The effects of catalyst,reaction temperature,S/C and WHSV on hydrogen production by catalytic reforming of phenol and ethanol were investigated.The results show that the H₂ yield of the Ni/La-SEP catalyst reaches the highest?79.1%?when the reforming reaction temperature is 650°C and S/C is 8¹0 and WHSV is 2 h^-1.Alkali metal?Mg,Ga?modified nickel based catalyst with 10 wt%content was prepared by coprecipitation method.The performance and structure of the catalyst were characterized by XRD,TPR and SEM.The mixture of phenol and ethanol was used as bio-oil model.The effects of catalyst type and reaction time on hydrogen production from reforming were investigated,and the performance of the catalyst was studied.Finally,a series of catalysts were compared.The results showed that the addition of La could enhance the activity and stability of Ni-based catalysts most obviously.The conversion of carbon and the yield of H₂ were up to 92.1%and 87.6%respectively,and no deactivation was observed within 50 h.Figure 31 table 9 reference 106.