《Table 3 XPS binding energy for the Si2p, Al2p and Sn3d5/2measured for different catalysts》

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《Fabrication of the Core-Shell Structured ZSM-5@Mg(Al)O and Its Catalytic Application in Propane Dehydrogenation》

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As mentioned above，in our experiments，the as-prepared Z@MA-x materials were used as the support，and then the Pt Sn Na-catalysts were obtained by the impregnation method.As listed in Table 2，the series of Pt Sn Na/Z@MA-x catalysts displayed higher value of platinum dispersion（DH2）than the Pt Sn Na/ZSM-5 catalyst.Possibly，this behavior might be attributed to the fact that the presence of Mg（Al）O species could help the adsorption of platinum chloride anions（Pt Cl62-）on the support，thus promoting the distribution of metallic particles.Zhang，et al.[12]discussed that a suitable addition of Mg species was beneficial to the platinum dispersion in the Pt Sn K/Al2O3 catalyst，but the excessive Mg species might block the platinum species，leading to the decrease of the metal dispersion.Besides，judging from the data listed in Table1，the pure ZSM-5 sample demonstrated the higher BET surface area.Thus，this relative improvement of metallic particles distribution would be likely attributed to the existing interactions between the active metal and the support which could affect either the surface characteristics of active metals or the degree of metallic sintering.However，it should be noted that the mesoporous structure of Z@MA-5 had been changed significantly（Table1），which would be harmful to the interaction between the metal precursors and the support[31].In this case，a suitable content of Mg（Al）O species would suppress the undesirable reaction and thus affect the catalytic performance in propane dehydrogenation.Further discussions will be presented in the following section.