硅纳米管负载的钌基催化剂费-托合成催化性能研究

摘要

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 503 K and 1. 0 Mpa and compared with that of SiO2 supported ruthenium catalyst (Ru/SiO2). The results indicated that ruthenium oxides can be completely reduced at 623 K 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.%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(503 K,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.