INVESTIGADORES
SORBELLO Cecilia
artículos
Título:
Hexagonal Ce1-xLnx(OH)CO3 as highly efficient precursors of nanocrystalline Ln(III-IV)-substituted ceria.
Autor/es:
SORBELLO, CECILIA; JOBBAGY, MATIAS
Revista:
CRYSTAL GROWTH & DESIGN
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2017
ISSN:
1528-7483
Resumen:
Monophasic hexagonal precursors, obeying to the formula Ce1-xLnx(OH)CO3, are introduced herein as versatile precursors for the obtainment of Ln(III-IV) substituted nanocrystalline ceria. To this aim, three hexagonal Ce1-xLnx(OH)CO3 families increasingly substituted with Ln(III)=Sm(III), Gd(III) or Pr(III), were prepared with high (quantitative) precipitation yields. Once Ce1-xLnx(OH)CO3 precursors are submitted to moderate thermal treatment (5 h, 723 K, air atmosphere), the oxidation of Ce(III) centers triggers a single step massive decomposition (dehydroxilation/decarbonatation), developing monophasic Ce1-xLnxO2-δ solid solutions with Ln(IV-III) substitutions up to 30%. These binary oxides exhibit large surface areas, up to 130 m2 g-1, even larger than those obtained by means of costly procedures.