The Fischer-Tropsch to olefins (FTO) process is a promising alternative non-petroleum route to produce value-added olefins. In this study, Co₂C nanoprisms formed via the CoMn spinel structure were used as the active phase for the FTO reaction and the product distribution was thoroughly investigated. A break from the traditional ASF model was found with much lower methane selectivity than that predicted by the ideal ASF law. In addition, the as-obtained hydrocarbons were mainly concentrated in the range of C₂ to C₁₂ with the C_2-12 selectivity as high as 91% while the C₁₃₊ selectivity as low as 5%, indicating a much narrower distribution, which was rarely observed in the FT reaction. Moreover, ∼86% of the hydrocarbon products were olefins with very high olefin to paraffin ratios, suggesting a promising route for the selective production of olefins directly from syngas. A modified ASF distribution model was proposed with three different chain growth probabilities to rationalize the non-ASF phenomenon.

费-托制烯烃（FTO）工艺是生产增值烯烃的有前途的非石油替代路线。在这项研究中，通过CoMn尖晶石结构形成的Co ₂ C纳米棱镜被用作FTO反应的活性相，并对产物分布进行了彻底的研究。发现与传统ASF模型相比，甲烷的选择性比理想ASF法则所预测的低得多。另外，所得烃主要集中在C ₂至C ₁₂范围内，C _2-12选择性高达91％，而C ₁₃₊选择性低至5％，表明分布窄得多，这在FT反应中很少观察到。此外，约86％的烃产物是烯烃与链烷烃比率非常高的烯烃，这表明直接从合成气中选择性生产烯烃的途径很有希望。提出了一种改进的ASF分布模型，该模型具有三种不同的链增长概率，以合理化非ASF现象。