Abstract
AbstractWater‐soluble Au−Ag bimetallic nanoparticles with different Au/Ag molar ratios stabilized by poly (amic acid) salt (PAAS) were synthesized by a one‐pot method and characterized by ultraviolet‐visible spectrophotometer (UV‐vis), X‐ray diffractometer (XRD), X‐ray photoelectron spectroscope (XPS) and High‐Angle Annular Dark Field scanning transmission electron microscope (HAADF‐STEM). The Au−Ag/PAAS catalysts displayed high activity for the aerobic oxidative coupling reaction of alcohols and amines in water. Attributing to the synergistic effect between Au and Ag, the activity of the bimetallic catalysts was superior to that of the corresponding monometallic catalysts. The catalyst with an Au/Ag molar ratio of 6/1 showed the best catalytic performance, which could be easily recovered and reused without significant loss of activity for over 5 times due to the pH response of PAAS.
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