TY  - JOUR
A1  - Pilar Yeste, Maria
A1  - Carlos Hernandez-Garrido, Juan
A1  - Kumke, Michael Uwe
A1  - Alvarado, Sarah
A1  - Cauqui, Miguel Angel
A1  - Juan Calvino, Jose
A1  - Primus, Philipp-Alexander
T1  - Low-temperature growth of reactive pyrochlore nanostructures on Zirconia-supported ceria
BT  - implications for improved catalytic behavior
JF  - ACS applied nano materials
N2  - The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development, particularly with regard to an increased focus on the use of renewable biogas and an emerging hydrogen economy. In this study, zirconia-supported ceria catalysts were synthesized, activated by using different thermochemical treatments, and characterized by way of temperature-programmed reduction (TPR), oxygen storage capacity, Xray diffraction, electron microscopy, and luminescence spectroscopy using Eu3+ as a spectroscopic probe. Through reduction-oxidation pretreatment routines, reactive pyrochlore structures were created at temperatures as low as 600 degrees C and identified through TPR and electron microscopy experiments. A structural relationship and alignment of the crystal planes is revealed in high-resolution scanning transmission electron microscopy experiments through the digital diffraction patterns. Low-temperature pretreatment induces the formation of reactive pyrochlore domains under retention of the surface area of the catalyst system, and no further morphological changes are detected. Furthermore, the formation of pyrochlore domains achieved through severe reduction and mild reoxidation (SRMO) treatments is reversible. Over multiple alternating SRMO and severe reduction and severe reoxidation (SRSO) treatments, europium spectroscopy and TPR results indicate that pyrochlore structures are recreated over consecutive treatments, whenever the mild oxidation step at 500 degrees C is the last treatment (SRMO, SRMO-SRSO-SRMO, etc.).
KW  - pyrochlore
KW  - nanocomposite
KW  - ceria
KW  - zirconia
KW  - supported catalyst
KW  - oxygen
KW  - storage capacity
Y1  - 2022
U6  - https://doi.org/10.1021/acsanm.2c00416
SN  - 2574-0970
VL  - 5
IS  - 5
SP  - 6316
EP  - 6326
PB  - American Chemical Society
CY  - Washington
ER  -