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A New Iron‐Based Carbon Monoxide Oxidation Catalyst: Structure–Activity Correlation
Author(s) -
Schoch Roland,
Huang Heming,
Schünemann Volker,
Bauer Matthias
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402551
Subject(s) - carbon monoxide , catalysis , mössbauer spectroscopy , carbon fibers , metal , x ray absorption spectroscopy , monoxide , absorption spectroscopy , chemistry , spectroscopy , inorganic chemistry , transition metal , diffuse reflectance infrared fourier transform , materials science , crystallography , photocatalysis , organic chemistry , composite number , physics , quantum mechanics , composite material
A new iron‐based catalyst for carbon monoxide oxidation, as a potential substitute for precious‐metal systems, has been prepared by using a facile impregnation method with iron tris‐acetylacetonate as a precursor on γ‐Al 2 O 3 . Light‐off and full conversion temperatures as low as 235 and 278 °C can be reached. However, the catalytic activity strongly depends on the loading; lower loadings perform better than higher ones. The different activities can be explained by variations of the structures formed. The structures are thoroughly characterized by a multimethodic approach by using X‐ray diffraction, Brunauer–Emmett–Teller surface areas, and Mössbauer spectroscopy combined with diffuse reflectance UV/Vis and X‐ray absorption spectroscopy. Consequently, isolated tetrahedrally coordinated Fe 3+ centers and phases of AlFeO 3 are identified as structural requirements for high activity in the oxidation of carbon monoxide.