The catalytic performances of Cu-Zn/SiO₂ with different Zn content and promoter on C₃H₆ epoxidation were investigated. Zn species was in favour of the formation of propylene oxide (PO), and PO selectivity was further increased after Cu-Zn/SiO₂ was modified by Na⁺. The promotive effect of Na⁺ on C₃H₆ epoxidation activity was much superior to that of Cl⁻. The PO formation rate on Cu₉₂Zn₈/SiO₂-Na₂CO₃ was nearly as high as 50 times that on Cu/SiO₂. Zn and Na⁺ could synergistically promote the reduction of Cu²⁺ to Cu⁺ species. The variation tendencies between C₃H₆ epoxidation activity and Cu⁺ content were in good agreement with each other. The role of Zn and Na⁺ was to enhance the Cu⁺ content via promoting the reduction of Cu²⁺ to Cu⁺ induced by Zn and Na⁺. Cu⁺ species played a vital role in PO formation and Cu⁺ may be the active site for C₃H₆ epoxidation reaction by O₂.

研究了不同Zn含量和助催化剂的Cu-Zn/SiO ₂对C ₃ H ₆环氧化的催化性能。Zn 物种有利于环氧丙烷 (PO) 的形成，并且在 Cu-Zn/SiO ₂被 Na ⁺改性后，PO 的选择性进一步提高。Na ⁺对C ₃ H ₆环氧化活性的促进作用远优于Cl ^-。Cu ₉₂ Zn ₈ /SiO ₂ -Na ₂ CO ₃上的PO生成率几乎是Cu/SiO ₂上的50倍. Zn和Na ⁺可以协同促进Cu ²⁺还原为Cu ⁺物种。C ₃ H ₆环氧化活性与Cu ⁺含量的变化趋势非常吻合。的Zn和Na的作用⁺是加强铜⁺通过促进铜的还原内容²⁺成Cu ⁺由锌和Na诱导⁺。Cu ⁺物种在PO 形成中起着至关重要的作用，Cu ⁺可能是O _{2 引起的}C ₃ H ₆环氧化反应的活性位点。