With the aim of studying the effect of support structure and preparation method on the hydrogenation performance of Ni-based catalysts. Hollow mesoporous silica spheres (hw-mSiO₂) containing tiny Ni nanoparticles highly dispersed on the inner surface (Ni@hw-mSiO₂) were synthesized by using carbon sphere as template with four continuous procedures, containing Ni deposition, silica shell coating, calcination and reduction. As demonstrated by SEM and TEM, the hollow structure was successfully obtained after calcination and the active Ni species was highly dispersed inside the porous silica shell, which is much smaller than the Ni-based catalysts prepared by a conventional impregnation method using hw-mSiO₂ (Ni/hw-mSiO₂) or commercial SiO₂ (Ni/mSiO₂) as supports. TPR and H₂-chemisorption results revealed the existence of strong metal-interaction and more hydrogenation sites in Ni@hw-mSiO₂. Therefore, Ni@hw-mSiO₂ catalyst achieved an excellent catalytic activity and stability in the selective hydrogenation of quinoline into 1–4-tetrahydroquinoline (py-THQ), due to the more dispersed Ni species, strong metal-support interaction and confinement effect of porous silica shell.

目的研究载体结构和制备方法对镍基催化剂加氢性能的影响。【摘要】：以碳球为模板,通过Ni沉积、二氧化硅壳包覆、煅烧四个连续步骤合成了内表面高度分散的Ni@hw-mSiO ₂中空介孔二氧化硅球(hw-mSiO ₂ )。和减少。SEM和TEM证明，煅烧后成功获得中空结构，活性Ni物种高度分散在多孔二氧化硅壳内，比传统浸渍法制备的镍基催化剂小得多，使用hw-mSiO ₂ (Ni/hw-mSiO ₂) 或商用 SiO ₂ (Ni/mSiO ₂ ) 作为载体。TPR和H _{2 -}化学吸附结果表明Ni@hw-mSiO _{2 中}存在强金属相互作用和更多氢化位点。因此，Ni@hw-mSiO ₂催化剂在喹啉选择性加氢生成1-4-四氢喹啉（py-THQ）方面具有优异的催化活性和稳定性，这是由于Ni物种更分散、金属-载体相互作用强和限制效应多孔二氧化硅壳。