《Table 3Catalytic performance of the 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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Reaction conditions:10 mmol EC，5 MPa H2，20 m L THF，20 wt%catalyst loading（based on the weight of EC）.

The catalytic performance of xβ‐25Cu/Si O2 catalysts for the hydrogenation of EC was investigated at 453 K for 4 h（Table3）.The unmodified 25Cu/Si O2 catalyst had 83.7%EG yield and60.2%methanol yield（entry 1）.In contrast，2β‐25Cu/Si O2 had85.8%of EG yield and 60.7%methanol yield，which was slight‐ly higher than the unmodified catalyst（entry 2）.Interestingly，the 5β‐25Cu/Si O2 with a medium amount ofβ‐cyclodextrin exhibited a much higher catalytic performance—there was98.8%EG selectivity and 71.6%of methanol selectivity with94.2%EC conversion（entry 3）.This result indicates that coat‐ingβ‐cyclodextrin onto the copper catalyst is an efficient method to prepare highly active copper catalysts.However，the EG yield rapidly decreased to 73.2%and methanol yield de‐creased to 47.6%over 8β‐25Cu/Si O2（entry 4）.We suspect that the excessive residual carbon obviously reduced the exposure of active sites of Cu and partially made the active Cu species inaccessible—presumably due to the lower Cu dispersion as determined by N2O titration.