Issue 3, 2022

Unravelling the metal–support interactions in χ-Fe5C2/MgO catalysts for olefin synthesis directly from syngas

Abstract

We reported a χ-Fe5C2/MgO catalyst for olefin synthesis directly from syngas (STO), showing high selectivity to C2–C4 olefins and catalytic stability. With characterization of the morphology, electronic structures, and adsorption/desorption properties using in/ex situ techniques (XPS, TEM, XRD, MES, PHTA and TPD), we revealed that MgO could act not only as a structural promoter to disperse the active iron phase and prevent particle agglomeration during the reaction, but also as an electronic modifier to transfer electrons to iron. In particular, by combination of spectroscopy and theory calculations, we have proved that the close intimacy between χ-Fe5C2 and MgO (∼0.3 electrons transfer from MgO to χ-Fe5C2) enhanced CO dissociative adsorption whilst weakening the secondary hydrogenation of olefins, leading to the enhancement of selectivity. The dual roles of MgO in χ-Fe5C2/MgO may shed light upon rational design of practical STO catalysts by taking advantage of the exceptional strong metal–support interactions (SMSIs).

Graphical abstract: Unravelling the metal–support interactions in χ-Fe5C2/MgO catalysts for olefin synthesis directly from syngas

Supplementary files

Article information

Article type
Paper
Submitted
06 Nov 2021
Accepted
09 Dec 2021
First published
10 Dec 2021

Catal. Sci. Technol., 2022,12, 762-772

Author version available

Unravelling the metal–support interactions in χ-Fe5C2/MgO catalysts for olefin synthesis directly from syngas

Y. Liu, X. Liu, Z. Yang, H. Li, X. Ding, M. Xu, X. Li, W. Tu, M. Zhu and Y. Han, Catal. Sci. Technol., 2022, 12, 762 DOI: 10.1039/D1CY02022F

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