Catalytic performance and attrition strength of spray-dried iron catalysts for slurry phase Fischer–Tropsch synthesis

Three iron Fischer–Tropsch (F–T) catalysts (100 Fe/3 Cu/5 K/16 SiO2 in parts by weight) in the form of micro-spherical particles were prepared by spray drying. Their particle size distribution was rather broad, ranging from 5 to 40 μm in diameter, regardless of the source of silica (colloidal silica, tetraethyl orthosilicate, or potassium silicate) employed in their preparation. Catalyst prepared employing colloidal silica had the highest attrition strength among all catalysts studied. After 345 h of testing in a stirred tank slurry reactor its morphology remained essentially unchanged, and it experienced small reductions in the volume mean diameter (5.4%) and generation of particles smaller than 10 μm in diameter was very small (0.7%). Catalytic performance of these catalysts during F–T synthesis was excellent. Syngas conversion was between 71 and 76%, whereas methane selectivity was between 2.0 and 3.5% and that of C5+ hydrocarbons was 78–89% (on C-atom basis).

. Three iron Fischer–Tropsch (F–T) catalysts were prepared by spray drying. Catalyst prepared employing colloidal silica had the highest attrition strength among all catalysts studied. After 345 h of F–T synthesis in a stirred tank slurry reactor (STSR) it retained its micro-spherical particle morphology. Catalytic performance of these catalysts during F–T synthesis was excellent (methane selectivity 2.0–3.5% and C5+ hydrocarbons 78–89% on C-atom basis).Figure optionsDownload high-quality image (165 K)Download as PowerPoint slideResearch highlights▶ Micro-spherical Fe F–T catalysts were prepared by spray drying. ▶ Catalytic performance was evaluated in a stirred tank slurry reactor (STSR). ▶ One of the catalysts retained micro-spherical shape after F–T reaction in the STSR. ▶ Catalysts had low methane (1.8–3.5%) and high C5+ hydrocarbon selectivity (75–89%).