AI Article Synopsis
- Iron-carbide-based catalysts are being studied for the hydrodeoxygenation of phenol to understand how the active site and alkali metals influence the reaction.
- Characterization techniques showed that under reaction conditions, the iron carbide catalysts rapidly changed to a stable form known as G@Fe, which is covered in defective graphene.
- Alkali metals (Na, K, Cs) had little effect on the transformation of iron carbide, but when G@Fe was doped with alkali metals, it blocked a reaction path that could otherwise reduce selectivity for the desired aromatic products.
Article Abstract
Iron-carbide-based catalysts have been explored in the selective hydrodeoxygenation (HDO) of phenol, aiming at elucidating the role of active site and alkali metal. Complementary characterization such as X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscopy coupled with electron energy loss spectroscopy, together with catalytic evaluations revealed a rapid structural reconstruction of iron carbide (Fe C) catalysts, leading to a stable defective graphene-covered metallic Fe active phase (G@Fe) under reaction conditions. Further studies using different alkali metals (i. e., Na, K, and Cs) revealed that alkali metals showed negligible effect on the phase transformation of Fe C. However, the reconstructed G@Fe doped with alkali metals inhibited the tautomerization, a facile reaction pathway to saturation of the aromatic ring, leading to enhanced selectivity to arene. The extent of inhibition of tautomerization or selectivity to arene was closely related to the degree of electron donation of alkali metal to Fe.
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| http://dx.doi.org/10.1002/cssc.202101382 | DOI Listing |
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