《Table 2.Binding energies (eV) of Ni 2p and Cu 2p for the catalysts.》

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《Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane》

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The pore structural properties of the samples are shown in Table 1.For the catalysts prepared by impregnation methods，the surface area of the samples decreased remarkably comparing the SAPO-11 support.However，the catalysts prepared by the mechanical mixing method showed similar surface area to SAPO-11，indicating that the metal and the support were not intimately combined in the catalysts prepared by the mechanical mixing method.The pore volume of the catalysts all decreased after the introduction of the metal，indicating that the metal occupied the pore of SAPO-11.For the catalysts prepared by impregnation and coprecipitation methods，both micropore and mesopore volumes decreased after the introduction of metal species.However，the catalysts prepared by mechanical mixing method only presented the decrease of mesopore volume，indicating that the metal species only interacted with the external surface of SAPO-11.All the catalysts had similar Cu loading of approximately 1.6 wt%.The catalysts prepared by impregnation and mechanical mixing methods had similar Ni loading，which was close to the nominal value of 3.0 wt%.However，the catalyst prepared by co-precipitation showed slightly lower Ni loading than the other catalysts，indicating that a small amount of nickel ions were not precipitated in the alkaline solution during the catalyst preparation.