Fig. S2 displays the XRD patterns of γ-Al2O3/TiO2 carrier, Cu-catalyst
and Cu/Ni-catalyst. The XRD phases of γ-Al2O3 and TiO2 can simply be
observed (Fig. S2 (a)). The characteristic peaks of CuO crystal could be
observed in the XRD pattern of Cu-catalyst (Fig. S2 (b)) and bimetallic
Cu/Ni-catalyst (Fig. S2 (c)), and the existence of sharp peak at 2θ of
35.1° indicated the existence of CuO