【作者】 邹汉波； 陈胜洲； 赵朝晖； 林维明；

【Author】 ZOU Han-bo,CHENG Sheng-zhou,ZHAO Zhao-hui,LIN Wei-ming (Department of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China)

【机构】 广州大学化学化工学院；

【摘要】 采用等体积浸渍法制备了不同镍负载量的Ni/γ-Al₂O₃催化剂,用于甲烷三重整制合成气反应,并通过XRD,H₂-TPR,CO₂-TPD研究了催化剂表面性质与催化性能之间的关系.研究表明,镍负载量为8%的Ni/γ-Al₂O₃催化剂具有较高的甲烷转化率,氢气的生成量最多.镍的负载量低于8%时,镍负载量越低,催化剂上的NiO与载体γ-Al₂O₃的相互作用越强.镍系催化剂主要由NiO微晶和Al₂O₃组成,其表面上的NiO物种反应后易流失和烧结.CO₂的化学吸附主要发生在催化剂的载体上.更多还原

【Abstract】 A series of Ni/γ-Al₂O₃ catalysts with different nickel loading were prepared with incipient wet impregnation method for tri-reforming of methane to syngas and characterized by X-ray diffraction（XRD）, H₂ temperature programmed reduction（H₂-TPR）and CO₂ temperature programmed desorption（CO₂- TPD）techniques.The results show that 8%Ni/γ-Al₂O₃ has the highest CH₄ conversion and the highest amount of hydrogen production.When the nickel loading is less than 8%,the lower nickel loading of the Ni/γ-Al₂O₃ catalysts,the stronger interaction between NiO andγ-Al₂O₃.The NiO crystal and Al₂O₃ exist on the surface of Ni/γ-Al₂O₃ catalysts,but the former is easy to be lost and sintered after reaction.CO₂ is mainly chemical adsorbed on theγ-Al₂O₃ carrier but not be adsorbed on the NiO species.更多还原