蒸氨法制备铜硅催化剂的二甲醚水蒸气重整制氢性能

采用蒸氨法制备出不同Cu负载量的xCu/SiO_2-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/SiO_2-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CuO和层状硅酸铜物相,经还原后分别形成Cu~0和Cu~+物种。与常规浸渍法制备的30Cu/SiO_2-IM催化剂相比,蒸氨法制备的30Cu/SiO_2-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Cu~0与Cu~+之间的协同作用相关。

Catalytic Performance for Hydrogen Production through Steam Reforming of Dimethyl Ether over Silica Supported Copper Catalysts Synthesized by Ammonia Evaporation Method

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.