Pregled bibliografske jedinice broj: 963019
In Situ Study of the Oxygen-Induced Transformation of Pyrochlore Ce2Zr2O7+x to the κ-Ce2Zr2O8 Phase
In Situ Study of the Oxygen-Induced Transformation of Pyrochlore Ce2Zr2O7+x to the κ-Ce2Zr2O8 Phase // 14th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Book of Abstracts
Beograd: Society of Physical Chemists of Serbia, 2018. str. 30-30 (pozvano predavanje, međunarodna recenzija, sažetak, znanstveni)
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Naslov
In Situ Study of the Oxygen-Induced Transformation of Pyrochlore Ce2Zr2O7+x to the κ-Ce2Zr2O8 Phase
Autori
Djerdj, Igor ; Urban, Sven ; Dolcet, Paolo ; Chen, Limei ; Moeller, Maren ; Khalid, Omeir ; Camuka, Hava ; Ellinghaus, Rüdiger ; Li, Chenwei ; Gross, Silvia ; Klar, Peter J. ; Smarsly, Bernd ; Over, Herbert
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
14th International Conference on Fundamental and Applied Aspects of Physical Chemistry - Book of Abstracts
/ - Beograd : Society of Physical Chemists of Serbia, 2018, 30-30
Skup
14th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Mjesto i datum
Beograd, Srbija, 24.09.2018. - 28.09.2018
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
X-RAY ; CATALYST PARTICLES ; CRYSTAL-STRUCTURE ; STORAGE CAPACITY ; SOLID-SOLUTION ; OXIDATION ; OXIDES ; CERIA ; REDUCTION ; BEHAVIOR
Sažetak
Temporary storage of oxygen in a solid catalyst is imperative for many important industrial oxidation reactions in the gas phase, for instance the post-treatment of automotive exhaust gas. A peculiar mixed Ce–Zr (1:1) oxide, the ordered κ-Ce2Zr2O8 phase, is a promising catalytic material exhibiting an extraordinarily high oxygen storage capacity (OSC) and high thermal and chemical stability. We elucidate the temperature-dependent transformation between the pyrochlore pyr- Ce2Zr2O7 and κ-Ce2Zr2O8 phase upon oxygen uptake by in situ X-ray diffraction, X-ray absorption, and in situ Raman spectroscopy, providing insights into the electronic and structural changes on the atomic level, which are at the heart of the extraordinarily high OSC. We demonstrate that the Ce3+ concentration can be followed during transformation in situ by Raman spectroscopy of the electronic spin flip in the f-shell of Ce3+. The catalytic activity of the κ-Ce2Zr2O8 phase was investigated without an additional active component such as noble metals (Pt, etc.). While the high OSC of the κ-phase is beneficial for the oxidation of CO, the oxidation of HCl turns out to be unaffected by the high OSC.
Izvorni jezik
Engleski
Znanstvena područja
Fizika, Kemija
