A New Iron‐Based Carbon Monoxide Oxidation Catalyst: Structure–Activity Correlation. Issue 17 (11th September 2014)

• Record Type: Journal Article
• Authors: Schoch, Roland; Huang, Heming; Schünemann, Volker; Bauer, Matthias
• Is Part Of: Chemphyschem. Volume 15:Issue 17(2014)
• Page Start: 3768
• Page End: 3775
• Publication Date: 2014-09-11
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201402551
• Languages: English
• ISSNs: 1439-4235

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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‐Al₂O₃. 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 Fe³⁺ centers and phases of AlFeO₃ are identified as structural requirements for high activity in the oxidation of carbon monoxide.</p> </abstract>