Hexagonal Ce1-xLnx(OH)CO3 as highly efficient precursors of nanocrystalline Ln(III-IV)-substituted ceria.

SORBELLO, CECILIA; JOBBAGY, MATIAS; SORBELLO, CECILIA; JOBBAGY, MATIAS

CRYSTAL GROWTH & DESIGN

AMER CHEMICAL SOC

Lugar: washington; Año: 2017 vol. 17 p. 5660 - 5666

1528-7483

Monophasic hexagonal precursors, obeying to the formula Ce1-xLnx(OH)CO3, are introduced herein as versatile precursors for the preparation 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.