Performance of silica nanotube supported ruthenium catalysts for Fischer-Tropsch synthesis
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摘要: 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。Abstract: 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.
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Key words:
- silica nanotube /
- ruthenium /
- Fischer-Tropsch synthesis /
- catalytic activity /
- selectivity
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