Abstract
We have studied the oxidation and reduction of iron in an Fe-doped MgO single crystal by , and using ambient-pressure XPS and NEXAFS. Surface charging of the crystal was rendered manageable by the ...
Highlights
Ternary oxides based on 3d metals and magnesium have proven useful in catalysis
High stability has been observed for Fe/MgO catalysts, which have been used in studies of ammonia synthesis [6] and FischerTropsch synthesis [7], as well as studies of nanoparticle magnetism [8,9] and carbon nanotube production [10]
Magnesium oxide is an insulator with a large band gap, and shows significant charging effects when exposed to the X-ray beam
Summary
Ternary oxides based on 3d metals and magnesium have proven useful in catalysis. For example, catalysts derived from NiO/MgO and CoO/MgO solid solutions have shown high activity and stability in steam- and dry reforming of methane, behavior linked mainly to the high resistance to sintering and to coking exhibited by the small metallic particles formed upon reduction of the materials [1,2,3,4,5]. A successful approach to studying the properties of both pure and doped MgO has been the epitaxial growth of such films on metal surfaces (most often Ag(100) or Mo(100)). Such thin films are amenable to characterization by e.g. low-energy electron diffraction and scanning tunneling microscopy [15], and studies utilizing them have yielded important insights into the surface properties of MgO and how these are influenced by dopants [16,17,18,19,20]
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