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<p>Pore size effects of support on Fischer–Tropsch reaction and deactivation rate over cobalt-based catalysts were investigated using mesoporous silica spheres. Macro-scale silica spheres were synthesized employing a sol–gel/oil-drop method, and different drying routes were applied to produce xerogel and ambigel spheres with average pore sizes of approximately 8 and 11&#xa0;nm. The synthesized spheres were evaluated as supports for cobalt-based catalysts under identical Fischer–Tropsch conditions (H<sub>2</sub>/CO = 2, 220–280&#xa0;°C, 10&#xa0;bar, GHSV = 4800&#xa0;h⁻<sup>1</sup>). CO conversion was found to be ≈&#xa0;13 percentage points higher for the catalyst supported on the 11&#xa0;nm pore diameter spheres than for the 8&#xa0;nm pore diameter spheres. The larger pore diameter also led to significantly higher catalytic activity and long-chain hydrocarbon selectivity. Deactivation kinetic analysis was interpreted in terms of catalyst-time yield (CTY) as a function of time on stream for both cobalt-based supports. The results showed that larger pores alleviate diffusion limitations and reduce pore blockage by heavy hydrocarbons.</p>

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Effect of the support pore structure on catalyst activity and deactivation in Fischer–Tropsch reaction

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Nazanin Nik Bakht,
  • Ali Akbar Mirzaei,
  • Abdolreza Samimi,
  • Fereydoon Yaripour

摘要

Pore size effects of support on Fischer–Tropsch reaction and deactivation rate over cobalt-based catalysts were investigated using mesoporous silica spheres. Macro-scale silica spheres were synthesized employing a sol–gel/oil-drop method, and different drying routes were applied to produce xerogel and ambigel spheres with average pore sizes of approximately 8 and 11 nm. The synthesized spheres were evaluated as supports for cobalt-based catalysts under identical Fischer–Tropsch conditions (H2/CO = 2, 220–280 °C, 10 bar, GHSV = 4800 h⁻1). CO conversion was found to be ≈ 13 percentage points higher for the catalyst supported on the 11 nm pore diameter spheres than for the 8 nm pore diameter spheres. The larger pore diameter also led to significantly higher catalytic activity and long-chain hydrocarbon selectivity. Deactivation kinetic analysis was interpreted in terms of catalyst-time yield (CTY) as a function of time on stream for both cobalt-based supports. The results showed that larger pores alleviate diffusion limitations and reduce pore blockage by heavy hydrocarbons.