Structure–activity relation of spinel-type Co–Fe oxides for low-temperature CO oxidation
作者： P. Mountapmbeme Kouotou , H. Vieker , Z. Y. Tian , P. H. Tchoua Ngamou , A. El Kasmi
DOI: 10.1039/C4CY00463A
关键词: Inorganic chemistry 、 X-ray photoelectron spectroscopy 、 Raman spectroscopy 、 Catalysis 、 Evaporation (deposition) 、 Spinel 、 Redox 、 Mixed oxide 、 Analytical chemistry 、 Spectroscopy 、 Materials science
摘要: A series of cobalt ferrite thin films was prepared via pulsed spray evaporation chemical vapour deposition (PSE-CVD). The samples were comprehensively characterised in terms structure, surface, morphology, and optical redox properties. Both X-ray diffraction (XRD) Raman analysis show that all exhibited an inverse spinel structure. photoelectron spectroscopy (XPS) results indicate the mainly composed Co, Fe O species, increase Co : Fe ratio with substitution by Co observed. Helium ion microscopy (HIM) images film morphology to be dependent on ratio. investigation property using ultraviolet-visible reveals content band gap energy. In situ emission FTIR used evaluate properties samples, a shift temperature higher values observed upon content. effect mixed oxide systems their catalytic performance for CO oxidation investigated. Co–Fe oxides exhibit substantially better than single α-Fe2O3. towards discussed respect participation surface lattice oxygen process. According XPS temperature-programmed reduction/oxidation (TPR/TPO) results, suprafacial mechanism where molecules react surface-adsorbed functions form CO2 proposed as dominant mechanism.
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