In order to investigate the effect of Mg / Al mole ratio on the catalytic performance of gold supported on Mg-Al layered double hydroxides( LDH) for the selective oxidation of alcohols,a series of Mg-Al LDH with various molar ratios of Mg / Al were prepared by the coprecipitation-hydrothermal crystallization method,on which Au nanoparticles were supported by the liquid-phase reduction method. The samples were characterized by XRD,N_2 physical adsorption,ICP-AES,AAS,TEM,CO_2-TPD,CO_2-In-situ DRIFTS and XPS. ...