硅纳米管负载的钌基催化剂费-托合成催化性能研究

以模板法合成的硅纳米管（SNT）为载体，用浆态浸渍法制备了钌基催化剂，采用氮气物理吸附、透射电子显微镜（TEM）、X射线粉末衍射（XRD）和氢气程序升温还原（H₂-TPR）等手段对其进行了表征。在固定床反应器上（503K，1.0MPa）考察了该催化剂的费-托合成反应活性及产物选择性，并与用商业二氧化硅为载体制备的催化剂上的反应结果进行了比较。结果表明，SNT和SiO₂负载的氧化钌在623K可被H₂完全还原；SNT负载的钌基催化剂上，钌氧化物颗粒较小、分散性好，还原后钌颗粒被较好地分散在硅纳米管上，且几乎所有的钌颗粒都分布在管内。与以SiO₂为载体的催化剂相比，以硅纳米管为载体的钌基催化剂具有较高的费-托合成活性。

Performance of silica nanotube supported ruthenium catalysts for Fischer-Tropsch synthesis

Silica nanotubes (SNT) were synthesized with carbon nanotube (CNT) as a template and used as the support to prepare ruthenium-based catalyst by slurry impregnation method. The catalyst was characterized by N₂ physisorption, XRD, H₂-TPR and TEM; its performance in Fischer-Tropsch synthesis (FTS) was evaluated in a fixed-bed reactor at 503K and 1.0MPa and compared with that of SiO₂ supported ruthenium catalyst (Ru/SiO₂). The results indicated that ruthenium oxides can be completely reduced at 623K by H₂. For the SNT supported ruthenium catalyst (Ru/SNT), the ruthenium particles are mainly located inside the nanotubes and are still well dispersed on SNT after H₂ reduction. Compared with Ru/SiO₂, the Ru/SNT catalyst exhibits higher activity in FTS because of the higher dispersion of ruthenium particles in SNT.