费托法
催化作用
沸石
壳体(结构)
X射线吸收精细结构
相(物质)
表征(材料科学)
化学
材料科学
化学工程
光谱学
纳米技术
有机化学
工程类
选择性
复合材料
物理
量子力学
作者
Jane N. Agwara,Nikki J. Bakas,Michael L. Neidig,Marc D. Porosoff
标识
DOI:10.1002/cctc.202200289
摘要
Abstract 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 C 2 ‐C 4 olefins and C 5+ hydrocarbons.
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