Oxygen-Induced Transformation of Pyrochlore Ce2Zr2O7+x to the κ-Ce2Zr2O8 Phase (CROSBI ID 667725)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
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
engleski
Oxygen-Induced Transformation of Pyrochlore Ce2Zr2O7+x to the κ-Ce2Zr2O8 Phase
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.
X-RAY ; CATALYST PARTICLES ; CRYSTAL-STRUCTURE ; STORAGE CAPACITY ; SOLID-SOLUTION ; OXIDATION ; OXIDES ; CERIA ; REDUCTION ; BEHAVIOR
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
36-36.
2018.
objavljeno
Podaci o matičnoj publikaciji
Materials, Methods & Technologies - 20th International Conference - Book of Abstracts
Elenite: International Scientific Events
Podaci o skupu
20th International Conference Materials, Methods & Technologies
poster
26.06.2018-30.06.2018
Elenite, Bugarska