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Issue 20, 2020
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Hierarchical Fe-modified MgAl2O4 as a Ni-catalyst support for methane dry reforming

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Abstract

MgAl2O4 and its Fe-modified analogue (MgFexAl2−xO4) were synthesized as supports with a nanostructure by a hydrothermal process, and employed as supports for Ni catalysts in methane dry reforming (DRM). All prepared supports had a hierarchical architecture displaying clusters of nanosheets. Fe-modified MgAl2O4 was characterized by X-ray diffraction (XRD), N2 adsorption–desorption, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and temperature-programmed desorption (TPD). The activity and stability of the catalysts with a hierarchical support were tested in DRM at 750 °C, 111.3 kPa, and a CH4 : CO2 ratio of 1. The Ni/MgAl2O4 sample with a 0.5 Mg : Al molar ratio showed higher activity than Ni on common MgAl2O4 due to the larger surface area and stronger metal interaction with the hierarchical support. Besides, a series of Ni/MgFexAl2−xO4 catalysts with an Fe/Ni ratio between 0 and 0.5 was synthesized and reduced, yielding a supported Ni–Fe alloy. The structure evolution of the Ni/MgFexAl2−xO4 catalyst during H2 temperature-programmed reduction (H2-TPR), CO2 temperature-programmed oxidation (CO2-TPO), and dry reforming was investigated by in situ XRD. For Fe/Ni ≤ 0.05, a Ni–Fe surface alloy is obtained with high catalyst activity, efficient control of carbon deposition and superior regeneration ability. Ni supported on hierarchical Fe-modified MgAl2O4 proves to be a promising and effective catalyst for methane dry reforming.

Graphical abstract: Hierarchical Fe-modified MgAl2O4 as a Ni-catalyst support for methane dry reforming

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Supplementary files

Article information


Submitted
03 Jun 2020
Accepted
16 Aug 2020
First published
17 Aug 2020

Catal. Sci. Technol., 2020,10, 6987-7001
Article type
Paper

Hierarchical Fe-modified MgAl2O4 as a Ni-catalyst support for methane dry reforming

H. Wang, N. V. Srinath, H. Poelman, C. Detavernier, P. Li, G. B. Marin and V. V. Galvita, Catal. Sci. Technol., 2020, 10, 6987
DOI: 10.1039/D0CY01119C

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