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Low‐Lanthanide‐Content CeO 2 /MgO Catalysts with Outstandingly Stable Oxygen Storage Capacities: An In‐Depth Structural Characterization by Advanced STEM Techniques
Author(s) -
Tinoco Miguel,
Sanchez Juan J.,
Yeste María P.,
LopezHaro Miguel,
Trasobares Susana,
Hungria Ana B.,
BayleGuillemaud Pascale,
Blanco Ginesa,
Pintado José M.,
Calvino José J.
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500855
Subject(s) - catalysis , redox , oxygen storage , materials science , chemical engineering , oxygen , hydrogen storage , transmission electron microscopy , scanning transmission electron microscopy , nanostructure , scanning electron microscope , nanoparticle , hydrogen , nanotechnology , chemistry , metallurgy , organic chemistry , engineering , composite material
A novel CeO 2 /MgO catalyst with low ceria loading has been synthesized. This catalyst showed unique redox properties compared with conventional high and low surface area CeO 2 . Advanced (scanning) transmission electron microscopy techniques revealed the presence of a variety of highly dispersed ceria nanostructures: isolated CeO x entities, CeO 2 clusters, as well as fairly small (<5 nm) CeO 2 nanoparticles. More interestingly, this CeO 2 /MgO catalyst showed outstanding stability in its redox response against high temperature aging treatments. Thus, after reduction in hydrogen at 950 °C and further oxidation at 500 °C, CeO 2 reduction effects took still place at low temperatures, and no significant loss of oxygen storage capacity (OSC) was detected. Unique ceria‐bilayer nanostructures were found and characterized in the aged catalyst. Their peculiar structural and chemical properties seem to be responsible for the large improvement observed in the stability of the redox response.