中文摘要：

采用蒸氨法制备出不同Cu负载量的xCu/SiO2-AE催化剂，并将其用于二甲醚水蒸气重整制氢反应。当Cu负载量为30%（w）时，30Cu/SiO2-AE催化剂表现出最佳的催化性能。结果显示，该方法制备的催化剂表面具有高度分散的Cu0和层状硅酸铜物相，经还原后分别形成Cu0和Cu＋物种。与常规浸渍法制备的30Cu/SiO2-IM催化剂相比，蒸氨法制备的30Cu/SiO2-AE催化剂具有优异的催化稳定性和活性，这与其独特的层状结构和表面Cu0与Cu＋之间的协同作用相关。

英文摘要：

A series of xCu/SiO2-AE catalysts with different Cu loadings was prepared by the ammonia evaporation method. The as-prepared catalysts were used for hydrogen production via steam reforming of dimethyl ether, and showed high catalytic activities. The 30Cu/SiO2-AE catalyst （with 30% （w） Cu loading） exhibits the best catalytic performance. Our studies reveal the presence of highly dispersed Cu0 and copper phyllosilicate on the surface of the catalysts, which can then be reduced to Cu0 and Cu＋ species, respectively. Compared with the 30Cu/SiO2-IM catalyst prepared by the conventional impregnation method, the remarkable catalytic stability and activity of the 30Cu/SiO2-AE catalyst are mainly ascribed to its unique lamellar structure and the cooperative effect between the surface Cu0 and Cu＋ species.