Study On Co-based Catalyst For Hydrogen Production Via Auto-thermal Reforming Of Acetic Acid

As a clean energy,hydrogen can be regarded as an alternative energy of fossil energy,and can be obtained from biomass.Bio-oil with high energy density can be produced from fast pyrolysis of biomass.In this work,acetic acid,as a typical component of bio-oil,was chosen as the feed for hydrogen production.To address the endothermicity of reforming process,auto-thermal reforming（ATR）of acetic acid（HAc）was adopted with oxygen in feed and tested for hydrogen production.Catalysts of Ca_xCo_yAlO_8±δhydrotalmite and La-Co-O perovskite were prepared to address issues of oxidation,sintering and carbon deposition during ATR process.In this work,Ca_xCo_yAlO_8±δhydrotalmite catalysts were prepared by coprecipitation method.The activity test results showed that Co_0.4AlO_2±δcatalysts were obviously deactivated;The Ca_3.5Co_0.5AlO_6±δcatalyst presented a stable activity:the HAc conversion(X_HAc)was about 100%and the hydrogen yield remained stable near 2.80 mol-H₂/mol-HAc.The characterization results indicated that the Ca_3.5Co_0.5AlO_6±δcatalyst with hydrotalmite structure was obtained,alkaline support of CaO was benificial to constrain carbon deposition and Ca₁₂Al₁₄O₃₃ carrier increased the stability of Co particles.La-Co-O perovskite catalysts were prepared via different preparation methods.The activity test results showed that LaCo cayalyst,which was prepared by sol-gel method,presented a stable activity,X_HAc was about 100%and the hydrogen yield remained stable near 2.80 mol-H₂/mol-HAc.The characterization results indicated that LC-Sg perovskite catalyst was formed,with high stablity and reduction.In addition,La₂O₂CO₃ was formed during the reaction,and could improve the resistance to carbond depostion.