载体对Ni基催化剂催化蒽醌加氢活性的影响

研究了载体对Ni基催化剂用于蒽醌法制备H₂O₂加氢活性的影响，同时对比了骨架镍的催化活性，考察Ni负载量对催化剂活性的影响。结果表明，负载在SiO₂上的催化剂比负载在γ-Al₂O₃上的催化活性高，对于Ni/SiO₂催化剂，Ni负载质量分数28.57%～50%时，加氢活性较高，按单位质量纯Ni上H₂O₂产量计算，Ni/SiO₂优于骨架镍催化剂，Ni负载量过高时，加氢活性降低。2-乙基蒽醌在Ni/SiO₂催化剂上的加氢为结构敏感型反应，当Ni在SiO₂的分散度达到约18%时，催化活性较佳。

Effect of supports on catalytic activity of Ni-based catalysts for anthraquinone hydrogenation

The effects of supports on catalytic activity of Ni-based catalysts for production of hydrogen peroxide via anthraquinone route were studied and the activity of the catalysts was compared with Raney nickel catalysts. The influence of Ni loadings on the catalytic activity was also investigated. The experimental results showed that catalytic activity of Ni-based catalyst supported on SiO₂ was superior to that on γ-Al₂O₃. Maximal hydrogenation activity was obtained over Ni/SiO₂ catalyst with Ni loadings of 28.57%-50%（mass fraction）. Ni/SiO₂ catalyst was superior to Raney nickel catalyst in terms of hydrogen peroxide yield over unit mass of pure nickel. Hydrogenation activity of Ni/SiO₂ catalyst declined when Ni loadings were over 50%. Hydrogenation of anthraquinone over Ni/SiO₂ catalyst was structure-sensitive reaction. Optimal catalytic activity was obtained over Ni/SiO₂ catalyst with Ni dispersion of about 18%