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 CuO and copper phyllosilicate on the surface of the catalysts, which can then be reduced to Cu-0 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 Cu-0 and Cu+ species.