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A novel Pd-Fe/α-Al2O3 catalyst was synthesized by incipient-wetness impregnation method with bayberry tannin as chelating promoter and commercial hollow column Raschig ring α-Al2O3 as support for the synthesis of diethyl oxalate from CO and ethyl nitrite.A variety of characterization techniques including N2 physical adsorption,optical microscopy,scanning electron microscopy and energy dispersive system (SEM-EDS),inductively coupled plasma optical emission spectroscopy (ICP-OES),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM),were employed to explore the relationship between the physicochemical properties and activity of catalysts.It indicated that a large number of phenolic hydroxyl groups in bayberry tannin can efficiently anchor the active component Pd,reduce the particle size and make the active Pd as a multi-ring distribution on the commercial α-Al2O3 support,which were beneficial to improve the catalytic activity for the production of diethyl oxalate from CO and ethyl nitrite.0.3 wt％ Pd-Fe/α-Al2O3 showed excellent catalytic activity and selectivity in a continuous flow,fixed-bed reactor with the loading amount of 10 mL catalysts.Under the mild reaction conditions,the space-time yield of diethyl oxalate was 978 g L-1 h-1 and CO conversion was 44％ with the selectivity to diethyl oxalate of 95.5％.