Research On Water Adsorption Perovskite Catalyst For Bio-alcohol Steam Reforming And Solid Oxide Fule Cell Power Generation

Solid oxide fuel cell(SOFC)is an electrochemical device that can directly transform hydrogen and hydrocarbons into electricity and heat.Currently,using biomass as fuel for SOFC power generation is one of the new trends,and bio-alcohols are major liquid biofuels with hydroxyl as characteristic functional group,which have priorities over hydrogen for SOFC utilization in volumetric heating value,transportation cost and shortage facilitation.At present,the anode material of SOFC is mainly Ni based cermet.The direct use of bio-alcohols is easy to cause carbon deposition and thus deactivates the anode,while the search for new anode materials will bring cost and process problems.Consequently,the external reforming-SOFC power generation route is proposed to convert bio-alcohols into H₂ and CO,which can release the utilization of bio-alcohols on SOFCs with high efficiency and stability.Steam reforming of bio-alcohols can offer highest selectivity of H₂.Therefore,our studies will focus on the development of catalysts that have high activity to bio-aoclohol steam reforming,and then using reformate gases for SOFC power generation.The perovskite can provide excellent water adsorption capacity,which can improve the catalytic acitivity and coking resistance of catalyst.Besides,in-situ growth of active metals from the perovskite in recent years has been widely investigated,which can enhanced interactions between metals and oxides,and thus improves coking rensistance.In this case,the main contents in my study can be summarized as follow:1)Selecting Ba Zr_0.1Ce_0.7Y_0.1Yb_0.1O_3-?as the perovskite supporter with enhanced water adsorption capacity,and Ni–BZCYYb catalyst is obtained by precipitation method.Bio-ethanol steam reforming is employed to obtain the catalytic performance and coking resistance,which is compared with those converntional catalysts;By characterization of spent catalysts with XRD analysis,the chemical stability is estimated.2)Selecting Pr_0.50Ba_0.50Mn_0.85Ni_0.15O_3-?single perovskite as catalyst precursor,by reducing it in high temperature,the in-situ growth of Ni nano-particles and phase transformation of Pr Ba Mn_1.7-xNi_xO_6-?double layered perovoskite can be achieved simultaneously to obtain the catalyst.Bio-ethanol steam reforming is conducted to evaluate catalytic performance and coking resistance,while TG and Raman spectrum is employed for insights of carbon removal mechanism.By conducting XRD and TG analysis for spent catalyst,the chemical stability is estimated.3)La Cr O₃-based perovskite is selected with Ni-doped and Ni/Ce co-doped,and these catalysts are conducted in bio-alocohol steam reforming to evaluated catalytic performance and coking resistance.By characterization of spent catalysts with XRD and TG analysis,coking resistance and chemical stability isestimated.Over investigating on Ce O₂ obtained from Ce-doping,analysis of water adsorption and enhancements of catalytic activity and coking resistance exsloved are discussed;4)Ni-GDC||GDC||LSCF-GDC single cells are fabricated,and reformate gases obtained form above bio-alcohols are inlet for SOFC power generation to estimate cell performances.By comparing with the electrochemical perfoamcen with that fueld by hydrogen,the feasibility of SOFC power generation with reformate gases is evaluated.