《Table 1Physicochemical properties of catalysts.》

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《Pd-Cu-Cl_x/Al_2O_3催化剂对CO氧化的稳定性（英文）》

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a Crystallite size of Cu2（OH）3Cl as obtained from XRD（Fig.3）b Obtained from XPS.

The H2-TPR profiles and H2 consumption of catalysts are shown in Fig.4.and Table 2，respectively.Pd/Al2O3 had an obvious H2 reduction peak at 38°C，while Cu/Al2O3 revealed twosuch peaks at 239 and 311°C.With the introduction of Cu to Pd/Al2O3，two distinct reduction peaks at 100–250°C and250–400°C were observed.Compared with the single metal catalysts，it was known that the presence of Pd promoted the reduction of Cu species.The intense reduction peak with a shoulder in the temperature range 100–250°C can be de-convoluted into two reduction peaks:one（peak A）was ascribed to the reduction of Pd species and the other（peak B）to the reduction of copper species，which was in close contact with the Pd species.The high-temperature reduction peak（peak C）at 250–400°C was attributed to the reduction of isolated copper species[23，24].