制备方法对Cu/Ce0.8Zr0.2O2催化剂催化甲醇水蒸气重整制氢性能的影响OA北大核心CSTPCD

The preparation methods can affect the type and dispersion of Cu species,as well as the interaction between Cu species and supports in catalysts.Cu/Ce0.8Zr0.2O2 catalysts with Ce0.8Zr0.2O2 sosolid as the support and Cu loading(mass fraction)of 15％were prepared by deposition precipitation,ammonia evaporation,impregnation and co-precipitation methods,respectively.The phase compositions,texture properties,Cu dispersions and microstructures of the catalysts were characterized by XRD,N2 physical adsorption/desorption,N2O titration,SEM,etc.And the catalytic performances of the catalysts for methanol steam reforming to produce hydrogen were evaluated in a fixed-bed reactor.The results show that compared with the Cu/Ce0.8Zr0.2O2 catalysts prepared by another three methods,the Cu/Ce0.8Zr0.2O2 catalyst(Cu/Ce0.8Zr0.2O2-DP)prepared by deposition precipitation method has the largest specific surface area(82.5 m2/g)and Cu specific surface area(206.0 m2/g),as well as the highest Cu dispersion(30.5％).Under the reaction conditions of 250 ℃,atmospheric pressure,n(deionized water)∶n(methanol)of 1.3∶1.0 and liquid space velocity of 6 mL/(g·h)for 24 h,Cu/Ce0.8Zr0.2O2-DP shows relatively optimal catalytic performance with methanol conversion rate of 95.2％,hydrogen production rate of 286.8 mmol/(g·h)and CO selectivity of 0.86％.