Direct synthesis of lower olefins (C_2-4⁼) from syngas through Fischer–Tropsch synthesis (FTS) is a promising approach to satisfy increasing demand for such chemical feedstocks. However, control of selectivity remains a major challenge for the Fischer–Tropsch to olefins (FTO) process. Herein, we designed a dual-bed FTO catalyst FeZnNa/zeolites, which contained zeolites filled with a conventional FTS catalyst. We explored the catalytic performance of different zeolites in the dual-bed catalyst, namely HY, NaY, ZSM-5, SAPO-34, Hβ, Liβ, Naβ, Kβ, and Rbβ. The integration behavior and mass ratios of the two active components, and reaction parameters of the FTO process were also optimized. The highest selectivity of C_2-4⁼ up to 50.5 %, and a high CO conversion of 92.9 %, were achieved for the FeZnNa/Naβ dual-bed catalyst. Importantly, the FeZnNa/Naβ catalyst had outstanding long-term stability with no obvious deactivation over 100 h of testing, making it a potential catalyst for industrial applications. The acidity and pore structure of the zeolite were found to be key factors for improving the yields of lower olefins from these dual-bed catalysts. The excellent catalytic performance of FeZnNa/Naβ is attributed to the suitable acidity and hierarchical pore structure of Naβ.

通过费-托合成法（FTS）由合成气直接合成低级烯烃（C _2-4 ⁼）是一种有前途的方法，可以满足对此类化学原料日益增长的需求。但是，选择性控制仍然是费托烯烃合成（FTO）工艺的主要挑战。本文中，我们设计了一种双床FTO催化剂FeZnNa /沸石，其中包含填充有常规FTS催化剂的沸石。我们探索了在HY，NaY，ZSM-5，SAPO-34，Hβ，Liβ，Naβ，Kβ和Rbβ的双床催化剂中不同沸石的催化性能。还优化了两种活性成分的积分行为和质量比，以及FTO工艺的反应参数。C的最高选择性_2-4 ⁼FeZnNa /Naβ双床催化剂的催化转化率高达50.5％，CO转化率高达92.9％。重要的是，FeZnNa /Naβ催化剂具有出色的长期稳定性，在100小时的测试中没有明显的失活，使其成为工业应用的潜在催化剂。发现沸石的酸度和孔结构是提高这些双床催化剂的低级烯烃产率的关键因素。FeZnNa /Naβ的优异催化性能归因于Naβ合适的酸度和分级的孔结构。