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Fabrication of Fe 2 C Embedded in Hollow Carbon Spheres: a High‐Performance and Stable Catalyst for Fischer‐Tropsch Synthesis
Author(s) -
Teng Xinsheng,
Huang Shouying,
Wang Jian,
Wang Hongyu,
Zhao Qiao,
Yuan Yong,
Ma Xinbin
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800488
Subject(s) - fischer–tropsch process , catalysis , carbide , materials science , chemical engineering , sintering , pyrolysis , carbon fibers , carbonization , syngas , thermal stability , chemistry , composite material , organic chemistry , composite number , scanning electron microscope , engineering , selectivity
The Fischer−Tropsch synthesis (FTS) is a non‐petroleum‐based alternative route, which directly produces fuels and value‐added chemicals (e. g. lower olefins) from coal‐, biomass‐ or natural gas‐derived syngas. The ϵ‐iron carbide, such as Fe 2 C, has been predicted to be active but not stable under high‐temperature FTS conditions. In this work, we have fabricated a novel catalyst with Fe 2 C embedded in hollow carbon spheres (HCS) by pyrolyzing the coated polymer and Fe(NO 3 ) 3 on silica spheres and then etching the hard template. XRD, XPS, TEM and N 2 physical adsorption were employed to characterize the evolution and properties of as‐prepared catalysts, which significantly depend on pyrolysis temperature. Under FTS conditions, the obtained catalysts exhibit good dispersion, robustness of geometric construction, and resistance to sintering. More importantly, Fe 2 C was confirmed as the dominant and stable iron carbide species. The unique chemical surrounding and confinement effect provided by carbon matrix contribute to these peculiarities that are responsible for superior activity and stability in FTS. Furthermore, we found that the products distribution could be manipulated by changing the geometric diameters of HCS, due to the tunable CO/H 2 ratio.