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http://hdl.handle.net/10867/142
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Title: | Formation of Catalytic Active Sites in Hydrothermally Obtained Binary Ceria−Iron Oxides: Composition and Preparation Effects |
Authors: | Tsoncheva, Tanya Rosmini, Consolato Dimitrov, Momtchil Issa, Gloria Henych, Jiri Němečková, Zuzana Kovacheva, Daniela Velinov, Nikolay Atanasova, Genoveva Spassova, Ivanka |
Keywords: | Cerium−Iron Binary Oxides Effect of Fe/Ce Ratio Effect of Preparation Conditions Methanol Decomposition Ethyl Acetate Oxidation |
Issue Date: | 2020 |
Publisher: | American Chemical Society |
Citation: | ACS Appl. Mater. Interfaces 2021, 13, 1838−1852 |
Abstract: | A series of mesoporous cerium−iron binary oxides was prepared by a
hydrothermal technique using CTAB as a template. The influence of the Fe/Ce ratio and the
variations in the preparation techniques such as the type of solvent and the precipitation
agent, the approach of the template release, and the temperature of calcination on the phase
composition, textural, structural, surface, and redox properties of the obtained materials was
studied in details by XRD, nitrogen physisorption, TPR, FTIR, UV−vis, XPS, Raman, and
Moessbauer spectroscopies. The materials were tested as catalysts in methanol decomposition
and total oxidation of ethyl acetate. It was assumed that the binary materials represented a
complex mixture of differently substituted ceria- and hematite-like phases. Critical assessment
of their formation on the base of a common mechanism scheme was proposed. This scheme
declares the key role of the formation of shared Ce−O−Fe structures by insertion of Fe 3+ in the ceria lattice and further competitive
compensation of the lattice charge balance by the existing in the system ions, which could be controlled by the Fe/Ce ratio and the
hydrothermal synthesis procedure used. This mechanism provides proper understanding and regulation of the catalytic behavior of
cerium−iron oxide composites in methanol decomposition with a potential for hydrogen production and total oxidation of ethyl
acetate as a model of VOCs. |
URI: | http://hdl.handle.net/10867/142 |
ISSN: | 1944-8252 |
Appears in Collections: | Secure, Clean and Efficient Energy
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