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- Title
CeO-MO (M: Zr, Ti, Cu) mixed metal oxides with enhanced oxygen storage capacity.
- Authors
Uzunoglu, Aytekin; Zhang, Hangyu; Andreescu, Silvana; Stanciu, Lia
- Abstract
The effect of composition on the thermal stability and oxygen storage capacity (OSC) of a series of CeO-MO x (M: Zr, Ti, Cu) mixed oxides was investigated. X-ray diffraction, N adsorption-desorption analysis (BET), transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were used to examine structural and microstructural properties. The total OSC of the fresh and aged mixed oxides were measured using thermogravimetric-differential thermal analysis at 600 °C, under alternating reductive and oxidative environment. Ceria doping was found to be effective toward an enhancement of its redox properties. The addition of Zr into the CeO lattice was found to have the least effect in enhancing the catalytic properties. In contrast with other studies in the literature [, ], increasing ZrO content led to an increase of the OSC of the samples of up to 522 μmol O g for 75 % Zr content. On the other hand, the CeO-CuO with (1:3) molar ratio showed an almost three times higher OSC value than CeO-ZrO, which is deemed in the literature as one of the most promising OSC materials. In this work, the highest OSC values (1565 μmol-O g) were obtained for the fresh sample with CeO-CuO (25:75) composition. The CeO-CuO (25:75) mixed oxide still showed the highest OSC values with an only 6 % drop of OSC after aging at 900 °C for 6 h among all aged catalysts. On the other hand, ZrO containing samples showed the best thermal resistance against aging.
- Subjects
CERIUM oxides; METALLIC oxides; X-ray photoelectron spectroscopy; THERMAL stability; X-ray diffraction; ADSORPTION (Chemistry); MICROSTRUCTURE
- Publication
Journal of Materials Science, 2015, Vol 50, Issue 10, p3750
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-015-8939-7