Napredna pretraga

Pregled bibliografske jedinice broj: 961561

Oxygen-induced structural transformation of pyrochlore Ce2Zr2O7+x to the k-Ce2Zr2O8 phase


Bijelić, Jelena; Djerdj, Igor; Urban, Sven; Dolcet, Paolo; Chen, Limei; Moller, Maren; Gross, Silvia; Klar, Peter J.; Kukovecz, Akos; Smarsly, Bernd; Over, Herbert
Oxygen-induced structural transformation of pyrochlore Ce2Zr2O7+x to the k-Ce2Zr2O8 phase // 8th Szeged International Workshop on Advances in Nanoscience - SIWAN8 - Book of Abstracts / Konya, Zoltan ; Kukovecz, Akos (ur.).
Szeged: Akademia Kiado, 2018. str. 91-91 (poster, međunarodna recenzija, sažetak, znanstveni)


Naslov
Oxygen-induced structural transformation of pyrochlore Ce2Zr2O7+x to the k-Ce2Zr2O8 phase

Autori
Bijelić, Jelena ; Djerdj, Igor ; Urban, Sven ; Dolcet, Paolo ; Chen, Limei ; Moller, Maren ; Gross, Silvia ; Klar, Peter J. ; Kukovecz, Akos ; Smarsly, Bernd ; Over, Herbert

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
8th Szeged International Workshop on Advances in Nanoscience - SIWAN8 - Book of Abstracts / Konya, Zoltan ; Kukovecz, Akos - Szeged : Akademia Kiado, 2018, 91-91

ISBN
978-963-454-315-2

Skup
8th Szeged International Workshop on Advances in Nanoscience - SIWAN8

Mjesto i datum
Szeged, Mađarska, 07-10.10.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Storage capacity ; in-situ X-Ray diffraction ; in situ Raman spectroscopy ; Rietveld analysis

Sažetak
The 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 -Ce2Zr2O8 phase, is a promising catalytic material exhibiting an extraordinarily high oxygen storage capacity (OSC) and high thermal and chemical stability. We elucidated the temperature-dependent transformation between the pyrochlore pyr- Ce2Zr2O7.3 and -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 k-Ce2Zr2O8 phase has been investigated without an additional active component such as Pt: While the high OSC of the kappa phase is beneficial for the oxidation of CO, the oxidation of HCl turns out to be not affected by the high OSC.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija



POVEZANOST RADA


Ustanove
Sveučilište u Osijeku - Odjel za kemiju