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<p>Support is a critical component of a catalyst, as its porosity and textural properties significantly influence catalytic performance. In this study, alumina–silica composite supports were synthesized via the sol–gel method under various synthesis and drying conditions, and their performance was evaluated in cobalt-based Fischer–Tropsch catalysts. The relevant composite was optimized in several steps. The concentration of C<sub>5+</sub> and conversion percentage were investigated as the response, and factors that affect the catalytic performance were optimized. Effective factors, including Al/Si and Propylene Oxide/Al ratio and drying method, were selected. In addition, various characterization methods such as BET, FESEM, XRD, EDS, TGA, and ICP techniques were used to investigate and characterize the catalyst and the support. Finally, the granular aerogel support with an Al/Si molar ratio of 4 and PO/Al ratio of 4 exhibited the highest C<sub>5+</sub> selectivity, lowest methane formation, and maximum CO conversion. These findings highlight the critical role of porous structure design and molar ratio optimization in enhancing the catalytic performance of cobalt-supported FTS catalysts.</p>

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Structural and performance optimization of alumina–silica aerogel supports for cobalt catalysts in Fischer–Tropsch synthesis

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Reza Nohtani,
  • Ali Akbar Mirzaei,
  • Seyyed Hossein Zohdi

摘要

Support is a critical component of a catalyst, as its porosity and textural properties significantly influence catalytic performance. In this study, alumina–silica composite supports were synthesized via the sol–gel method under various synthesis and drying conditions, and their performance was evaluated in cobalt-based Fischer–Tropsch catalysts. The relevant composite was optimized in several steps. The concentration of C5+ and conversion percentage were investigated as the response, and factors that affect the catalytic performance were optimized. Effective factors, including Al/Si and Propylene Oxide/Al ratio and drying method, were selected. In addition, various characterization methods such as BET, FESEM, XRD, EDS, TGA, and ICP techniques were used to investigate and characterize the catalyst and the support. Finally, the granular aerogel support with an Al/Si molar ratio of 4 and PO/Al ratio of 4 exhibited the highest C5+ selectivity, lowest methane formation, and maximum CO conversion. These findings highlight the critical role of porous structure design and molar ratio optimization in enhancing the catalytic performance of cobalt-supported FTS catalysts.