《Table 1Physical‐chemical properties of xβ‐25Cu/Si O2 catalysts.》

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《碳酸乙烯酯选择加氢合成甲醇与乙二醇高效稳定Cu/SiO_2催化剂研究（英文）》

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a Determined by ICP‐AES.b Determined by N2O titration.c Obtained by N2 physisorption.

Fig.2 presents N2 adsorption‐desorption isotherms of a se‐ries of xβ‐25Cu/Si O2 catalysts；the corresponding textural properties are also summarized in Table 1.The actual copper loadings were determined by ICP‐AES，and the results showed that the actual Cu contents were essentially close to the nomi‐nal value.The N2 physisorption isotherms of xβ‐25Cu/Si O2catalysts exhibited type IV isotherms with an H1‐type hystere‐sis loop[34]indicating that the mesoporous structures were formed.Table 1 shows that the unmodified 25Cu/Si O2 had a surface area of 242 m2 g–1 with an average pore size of 5.2 nm.In contrast，the surface areas of xβ‐25Cu/Si O2（x=2，5，8）were326–351 m2 g–1，and the values gradually declined with in‐creasingβ‐cyclodextrin content.These results indicated that the surface area of 25Cu/Si O2 could be markedly enhanced viaβ‐cyclodextrin.Meanwhile，the average pore sizes of the xβ‐25Cu/Si O2 catalysts were primarily distributed in the larger pore regions（5.5–7.5 nm）.This is beneficial for mass transfer during the reaction process and could provide abundant easily accessible active sites for hydrogenation.N2O titration indicat‐ed that the introduction of an appropriate amount ofβ‐cyclodextrin could enhance the copper dispersion.Specifi‐cally，the maximal metallic Cu surface area of Cu/Si O2 was 26.8m2 g–1 with a high Cu dispersion of 28.6%.Nevertheless，the introduction of excessiveβ‐cyclodextrin，i.e.8%，obviously de‐creased the metallic Cu0 surface area（19.7 m2 g–1）.