Effect of Mg/Al Ratio on Catalytic Behavior of Fischer–Tropsch Cobalt-Based Catalysts Obtained from Hydrotalcites Precursors
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- 作者：Angélica Forgionny ; J. L. G. Fierro ; Fanor Mondragón ; Andrés Moreno
- 关键词：Co ; based catalyst ; Co ; precipitation method ; Hydrotalcite ; Mixed oxide ; Fischer–Tropsch synthesis
- 刊名：Topics in Catalysis
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：59
- 期：2-4
- 页码：230-240
- 全文大小：963 KB
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J. L. G. Fierro (2)
Fanor Mondragón (1)
Andrés Moreno (1)
1. Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, UdeA - Colombia, Calle 70 No. 52 - 21, Medellín, Colombia
2. Grupo de Energía y Química Sostenibles (EQS), Instituto de Catálisis y Petroleoquímica-CSIC, Marie Curie 2, 28049, Madrid, Spain - 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1572-9028
文摘
Layered double hydroxides of the hydrotalcite (HT)-type materials have been considered as promising supports for Co-based Fischer–Tropsch synthesis (FTS) catalysts. In this work the effect of the Mg/Al ratio on the catalytic behavior of cobalt-based catalysts obtained from HTs precursors have been studied. Cobalt supported on Mg–Al oxides obtained from HTs Mg–Al precursors were prepared by wet impregnation method and calcined at 300 °C. The textural, structural and reducibility properties of the samples were characterized using different techniques. FTS was evaluated in a down-flow fixed-bed reactor at 20 bar, 250 °C and H2/CO ≈ 2 molar ratio. All catalysts were active and stable during 72 h testing time. The stability was improved by the presence of magnesium in the alumina support; however the CO conversion was negatively affected by increasing the Mg/Al ratio. The reducibility of cobalt decreased as the Mg/Al ratio increased, probably due to the strong Co–O–Mg interaction as evidenced by the formation of CoxOy–MgO mixed oxide. Furthermore, the activity of the catalysts was correlated with the H2-chemisorption measurements. The results suggest that HTs as Co-based catalysts were highly stable in FTS. Keywords Co-based catalyst Co-precipitation method Hydrotalcite Mixed oxide Fischer–Tropsch synthesis