《Table 2 Detailed analysis data of fitted hydroxyl groups》

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《A Study on the Coking Sites of γ-Alumina Surface Using 1-Methylnaphthalene as the Model Reactant》

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In order to study the influence of carbon species on the types and distribution of hydroxyl groups on the surface of the support，the samples were characterized by IR-OH，with the results shown in Figure 4.The results of Figure 4indicate that the types of hydroxyl groups of 1-MN/Al and1-MN/Al-AC were not notably changed in comparison withγ-Al2O3，and the peaks centered around 3 775 cm-1，3 730 cm-1，and 3 674 cm-1 were assigned to the basic，neutral，and acidic hydroxyl groups，respectively[22-24].According to the relative peak positions of three types of hydroxyl groups，the curve-fitting analysis was performed with pure Gaussian type peaks to obtain the distribution of hydroxyl groups，with the deconvolution results shown in Figure 5.Meanwhile the concentration of each type of hydroxyl groups could be calculated by the integral area of fitted hydroxyl groups divided by the mass of the samples[25-26]，with the detailed information of fitted hydroxyl groups listed in Table 2.According to the results of Table 2，the concentrations of the basic，neutral and acidic hydroxyl groups all decreased in the following order:Al>1-MN/Al>1-MN/Al-AC.Specifically，the concentration of basic hydroxyl groups of 1-MN/Al decreased much more than that of other types of hydroxyl groups compared with Al，indicating that the coke precursors were probably originated from the adsorption of1-MN on the basic hydroxyl groups ofγ-Al2O3 surface.For1-MN/Al-AC，the same change trend could be obtained as compared with 1-MN/Al，which indicated that the coke deposits with a highly-condensed state were also mainly generated from the interaction between the coke precursors with the basic hydroxyl groups on the surface ofγ-Al2O3.