RT journal article
T1 An atomically efficient, highly stable and redox active Ce0.5Tb0.5Ox (3% mol.)/MagO catalyst for total oxidation of methane
A1 Sánchez Gil, Juan José
A1 López Haro, Miguel
A1 Hernández Garrido, Juan Carlos
A1 Blanco Montilla, Ginesa
A1 Cauqui López, Miguel Ángel
A1 Rodríguez-Izquierdo Gil, José María
A1 Pérez Omil, José Antonio
A1 Calvino Gámez, José Juan
A1 Yeste Siguenza, María del Pilar
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Cerium Oxide
K1 Cerium Terbium Mixed Oxides
K1 Catalyst
K1 methane oxidation
K1 oxygen storage capacity
K1 OSC
K1 MgO
K1 HRTEM
K1 Electron Microscopy
K1 HAADF-STEM
AB Redox and	 catalytic performance in total methane oxidation of a nanostructured ceria-terbia catalyst supported	on magnesia is presented and compared to that of a pure ceria	catalyst supported on	 MgO.	 The	 investigated material, Ce0.5Tb0.5Ox (3%	mol.)/MgO, features	several remarkable properties: a quite low total molar loading of the two lanthanide elements, high reducibility as	well	as	very	high	oxygen storage capacity at low	temperatures and higher catalytic activity	 than MgO supported	 CeO2. In terms	of lanthanide atomic	content terms, the catalytic performance	of Ce0.5Tb0.5Ox (3% mol.)/MgO largely	improves that of bulk type ceria and	ceria-magnesia	solid solutions.	Such	behavior implies a proper	optimization in	the usage	of the lanthanide elements. A	second contribution to atomic economy in	the catalyst design relates	to the fact that	the novel	formulation demonstrates	a good stability	in the redox and catalytic	performance against very high	temperature treatments. An investigation of the structure	of both the fresh and high	temperature-aged catalyst at atomic scale, by means of complementary aberration corrected microscopy techniques, reveals the occurrence of a variety of highly dispersed, exotic, lanthanide-containing	 nanostructures,	 which span from isolated, atomically	dispersed,	Ln species, to nanometer-sized	 CeTbO2-x patches,	 extended	CeTbO2-x bilayers and 3D CeTbO2-x nanoparticles. Nanoanalytical results evidence mixing	of	the two lanthanides at atomic levels	in these nanostructures. The combined effect of nanostructuring, mixing of the lanthanides at atomic level and interaction with the MgO oxide are at the roots of	the	 improvement in functional, redox and catalytic	properties	of the novel Ce0.5Tb0.5Ox (3%	mol.)/MgO catalyst.
PB The Royal Society of Chemistry
SN 2050-7488
YR 2019
FD 2019-03-03
LK http://hdl.handle.net/10498/30220
UL http://hdl.handle.net/10498/30220
LA eng
NO The authors acknowledge financial support from FEDER/MINECO	 Projects (Ref: MAT2017-87579-R and	 MAT2016-81118-P) and	Junta de Andalucía (FQM334, FQM110). The Electron Microscopy	data	were	all acquired at DME SC-ICyT UCA
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026