CuO/ZnO/Y_2O_3/γ-Al_2O_3双功能催化剂上二甲醚水蒸气重整制氢  

Dimethyl Ether Steam Reforming for Hydrogen Production on CuO/ZnO/Y_2O_3/γ-Al_2O_3 Bi-Functional Catalyst

作　　者：王晓蕾[1,2] 潘相敏[2,3] 林瑞[2,3] 任克威[2,4] 寇素原[2,3] 马建新[2,3] 

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]同济大学新能源汽车工程中心,上海201804 [3]同济大学汽车学院,上海201804 [4]华东理工大学资源与环境工程学院,上海200237

出　　处：《物理化学学报》2009年第6期1097-1102,共6页Acta Physico-Chimica Sinica

基　　金：同济大学-壳牌公司国际合作项目(20071193)资助

摘　　要：将沉积-沉淀法制备的CuO/ZnO/Y2O3催化剂同γ-Al2O3进行机械混合,制备了CuO/ZnO/Y2O3/γ-Al2O3双功能催化剂,用于二甲醚水蒸气重整制氢反应,实验结果表明其活性、稳定性等均优于常用的CuO/ZnO/Al2O3/γ-Al2O3催化剂.结合N2吸附-脱附(BET)、N2O化学吸附(N2O chemisorption)、NH3程序升温脱附(NH3-TPD)、X射线衍射(XRD)、H2程序升温还原(H2-TPR)等表征手段研究了两种催化剂在表面酸性及微观结构上的差异,发现CuO/ZnO/Y2O3催化剂具有相对较高的铜分散度,铜晶粒更加细小化,并且具有高温稳定性的Y2O3可能起到隔离铜的作用,在一定程度上防止了铜晶粒的团聚,从而改善了重整组分的性能,提高了双功能催化剂的重整制氢活性及稳定性.CuO/ZnO/Y2O3 was prepared by deposition-precipitation method and was mechanically mixed with T-Al2O3 to prepare CuO/ZnO/Y2O3/γ-Al2O3 hi-functional catalysts for dimethyl ether steam reforming （DME SR）. The results indicated that CuO/ZnO/Y2O3/γ-Al2O3 bi-functional catalyst showed superior performance to the conventional CuO/ZnO/Y2O3/γ-Al2O3 bi-functional catalysts. Differences in surface acidity and microstructure between the two bi- functional catalysts are discussed with reference to Brunaner-Emmett-Teller （BET）, N2O chemisorption, NH3 temperature- programmed desorption （NH3-TPD）, X-ray diffraction （XRD） and H2 temperature-programmed reduction （H2-TPR） analyses. The results showed that CuO/ZnO/Y2O3/γ-Al2O3 had better copper dispersion on its surface and smaller copper crystallites than CuO/ZnO/Y2O3/γ-Al2O3 did. Additionally, Y2O3 has better thermal stability than Al2O3, which may prevent copper crystallites from conglomeration. The performance of the reforming component and the catalytic activity as well as stability of the hi-functional catalyst was thus improved.

关 键 词：氧化钇 氧化铝 铜 锌 二甲醚水蒸气重整 制氢 

分 类 号：O643.32[理学—物理化学]