Fischer-Tropsch synthesis (FTS) is explored as a candidate one-step process for the selective conversion of synthesis gas to short and branched hydrocarbons. Novel structured catalysts for in-situ upgrading of FTS products to gasoline-range hydrocarbons are synthesized by coating controlled-thickness ZSM-5 films on the surface of Co-Al₂O₃/monolith substrates. FTS catalysts with coating of microporous and mesoporous ZSM-5 are synthesized, characterized and tested. These catalysts leverage the benefits of monolith reactors as efficient mass and heat transfer structures, with the ZSM-5 layer as a hydrocarbon cracking and isomerization agent. Hierarchical ZSM-5 co-catalysts are shown to relax mass transfer limitations through the zeolite film, thus improving conversion and selectivity. The proposed co-catalysts exhibit high CO conversion and high gasoline selectivity with high octane number. Loss of catalyst activity was observed and attributed to ZSM-5 pore plugging by C₁₃+ saturated hydrocarbons. In-situ regeneration of the catalysts enabled stability in FTS performance.

费-托合成（FTS）是一种将合成气选择性转化为短烃和支链烃的候选一步法。通过将可控制厚度的ZSM-5膜涂覆在Co-Al ₂ O ₃的表面上，合成了用于将FTS产品原位转化为汽油范围的烃的新型结构催化剂/整体基材。合成，表征和测试了具有微孔和中孔ZSM-5涂层的FTS催化剂。这些催化剂利用整体式反应器的优势作为有效的传质和传热结构，ZSM-5层用作烃裂化和异构化剂。分层ZSM-5助催化剂显示出可通过沸石膜缓解传质限制，从而提高了转化率和选择性。所提出的助催化剂在高辛烷值下表现出高的CO转化率和高的汽油选择性。观察到催化剂活性的损失，并归因于ZSM-5孔被C ₁₃ +饱和烃堵塞。催化剂的原位再生使FTS性能稳定。