A series of bimetallic Ir-Re/G-6 catalysts with different Ir/Re mole ratios were synthesized by impregnation method using H_2 Ir Cl6 and NH4 ReO4 as precursors. The physiochemical properties of the catalysts were investigated by the techniques of X-ray diffraction(XRD),transmission electron microscopy(TEM),H_2 temperature-programmed reduction(H_2-TPR),X-ray photoelectron spectroscopy(XPS),NH_3 temperature-programmed desorption(NH_3-TPD),pyridine adsorption Fourier-transform infrared(Py-IR) and in-situ CO ad...