Challenges and Opportunities of Fe‐based Core‐Shell Catalysts for Fischer‐Tropsch Synthesis
Challenges and Opportunities of Fe‐based Core‐Shell Catalysts for Fischer‐Tropsch Synthesis
复制标题
费托合成铁基核壳催化剂的挑战与机遇
DOI：
10.1002/cctc.202200289
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发表时间：
2022
期刊：
影响因子：
4.5
通讯作者：
Porosoff, Marc D.
中科院分区：
文献类型：
--
作者：
Agwara, Jane N.;Bakas, Nikki J.;Neidig, Michael L.;Porosoff, Marc D.
铁基催化剂是一种活性、选择性和低成本的选择，可用于调节费托合成（FTS）对所需轻烯烃的选择性。通过将Fe包封在ZSM-5内，所得核-壳催化剂具有通过在沸石壳的酸位点上发生的二次反应来控制产物分布的潜力。在本文中，通过种子定向生长技术将Fe封装在ZSM-5中，并使用一套分析技术进行表征，包括穆斯堡尔谱和X射线吸收精细结构（XAFS）。核-壳催化剂的表征表明，一些Fe基活性相在晶种定向生长期间不稳定，证明了与将Fe基活性相包封在沸石内相关的挑战。然而，将核-壳催化剂的FTS性能与通过初湿含浸法合成的Fe基对照进行比较，表明对所需C2-C4烯烃和C5+烃的选择性提高。
Fe‐based catalysts are an active, selective, and low‐cost option for tuning Fischer‐Tropsch synthesis (FTS) selectivity toward desirable light olefins. By encapsulating Fe within ZSM‐5, the resultant core‐shell catalysts have the potential to control the product distribution via secondary reactions that occur over the acid sites of the zeolite shell. In this paper, Fe is encapsulated within ZSM‐5 via the seed‐directed growth technique and characterized with a suite of analytical techniques including Mössbauer spectroscopy and X‐ray absorption fine structure (XAFS). Characterization of the core‐shell catalysts indicates that some of the Fe‐based active phase is destabilized during seed‐directed growth, demonstrating the challenges associated with encapsulating an Fe‐based active phase within zeolites. However, comparing FTS performance of the core‐shell catalyst with the Fe‐based control synthesized via incipient wetness impregnation demonstrates improved selectivity toward the desired C2‐C4olefins and C5+hydrocarbons.