Reduced cobalt phases of ZrO2 and Ru/ZrO2 promoted cobalt catalysts and product distributions from Fischer–Tropsch synthesis

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Vol. 190; pp. 82 - 89
• Main Authors: Kangvansura, Praewpilin, Schulz, Hans, Suramitr, Anwaraporn, Poo-arporn, Yingyot, Viravathana, Pinsuda, Worayingyong, Attera
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-12-2014
• Subjects: Alkenes; Branched; Catalysis; Catalysts; Cobalt; Fischer–Tropsch cobalt catalyst; Fischer–Tropsch product distributions; Fischer–Tropsch synthesis; Fischer–Tropsch ZrO2/Co/SiO2 catalyst; Silicon dioxide; Synthesis; Time-resolved XANES reduction; Zirconium dioxide; Time-resolved XANES reduction; Fischer–Tropsch cobalt catalyst; Fischer–Tropsch ZrO2/Co/SiO2 catalyst; Fischer–Tropsch product distributions; Fischer–Tropsch synthesis
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2014.09.008

•Ru/ZrO2, ZrO2 promoted Co/SiO2 for FTS were reduced by time resolved XANES.•Reduced catalysts resulted from XANES reduction showed the mixed phases of Co, CoO.•The highest percentages of CoO resulted from the high ZrO2 promoted Co/SiO2.•Product distributions of 1-alkenes, iso-alkanes indicated sites for FTS and the 2° reaction.•Alkene readsorption were high corresponding to the high CoO forming branched alkanes.
Co/SiO2 catalysts were promoted with 4% and 8% ZrO2. Small amounts (0.07%) of Ru were impregnated onto 4%ZrO2/Co/SiO2. Catalysts resulting from time-resolved XANES reduction showed mixed phases of Co and CoO, with the highest percentages of Co resulting from Ru/4%ZrO2/Co/SiO2 and the highest percentages of CoO resulting from 8%ZrO2/Co/SiO2. Product distributions of n-alkanes, iso-alkanes and alkenes during Fischer–Tropsch Synthesis (FTS) were used to investigate the catalyst performance of 4%ZrO2/Co/SiO2 8%ZrO2/Co/SiO2 and Ru/4%ZrO2/Co/SiO2. FTS steady state was studied by growth probabilities of n-alkane products. No 1-alkene was produced from Ru/4%ZrO2/Co/SiO2, indicating high availability of Fischer–Tropsch sites for long chain hydrocarbon growth, despite high methanation. Branched alkanes produced from the secondary reaction were related to the high CoO percentages on 8%ZrO2/Co/SiO2. Alkene readsorption sites were high, corresponding to the high CoO percentages, causing a high probability of forming branched alkane products.