吸附相反应技术制备双金属 Ag-Ni 催化剂用于硝基苯液相加氢

 浙江大学化学工程与生物工程学系, 浙江杭州 310027 摘要：采用吸附相技术在乙醇-水体系中分别制备了硅胶和高岭土负载的 Ag-Ni 双金属催化剂, 并用于硝基苯低温液相加氢制苯胺反应. 考察了催化剂中 Ni 含量和 Ni/Ag 比对催化剂形貌和活性的影响. 结果表明, 高岭土或硅胶负载的催化剂在 Ni/Ag = 5 (摩尔比) 时活性较高, 且都存在一个最佳 Ni 含量, 分别为 0.04% 和 0.03%. 在相同条件下, 以高岭土负载的 Ag-Ni 催化剂的活性和苯胺收率更高.

Liquid-Phase Hydrogenation of Nitrobenzene over Ag-Ni Bimetallic Catalysts Prepared by Adsorption Phase Synthesis

Ag-Ni bimetallic nano-catalysts were prepared using silica and kaolin as the support by adsorption phase synthesis. The activity of these catalysts was evaluated by liquid-phase hydrogenation of nitrobenzene to aniline. By changing the Ni content and Ni/Ag molar ratio in the catalysts, the differences of morphology and activity between the catalysts on two supports were investigated. The results of tempera-ture-programmed reduction and transmission electron microscopy indicate that the bimetallic catalysts show higher activity when Ni/Ag molar ratio is 5. There is an optimal Ni content in the catalysts on both silica and kaolin, which is 0.04% for kaolin and 0.03% for silica. The catalyst supported by kaolin is more active and has higher aniline yield than the catalyst supported on silica.