Effect of Thermal Treatment on the Textural Properties of CeO2 Powders Synthesized in Near- and Supercritical Alcohols.
CeO2 nanocrystals (NCs) have attracted increasing interest over the past few years, in particular for their use in catalytic reactions. Syntheses mediated by near- and supercritical alcohols have proven to be innovative ways to obtain CeO2 NCs with controlled crystallite sizes (from 3 to 8 nm depending on the alcohol) and surface functionalities, with alcohol moieties. When submitted to a thermal treatment at 500 °C, required to desorb/degrade surface organic species, these powders displayed different behaviors depending on the alcohol used during the synthesis. Cerium oxide powders synthesized in sc-MeOH, sc-EtOH and sc-iPrOH undergo sintering during treatment at 500 °C, with a decrease of their specific surface area. Conversely, those synthesized in sc-BuOH, nc-PentOH and nc-HexOH keep their initial crystallite sizes and morphology, but show a great enhancement of their specific surface area (up to 200 m(2) g(-1)), which is unprecedented after such a thermal treatment.
CNRS, Univ. Bordeaux, ICMCB, UPR9048, F-33600 Pessac, France.
Cédric
C
Slostowski
CNRS, Univ. Bordeaux, ICMCB, UPR9048, F-33600 Pessac, France.
Samuel
S
Marre
Institut des Sciences Moléculaires, Université de Bordeaux, UMR 5255 CNRS, C2M Team, 351 cours de la Libération, 33405, Talence, France.
Odile
O
Babot
Institut des Sciences Moléculaires, Université de Bordeaux, UMR 5255 CNRS, C2M Team, 351 cours de la Libération, 33405, Talence, France.
Thierry
T
Toupance
CNRS, Univ. Bordeaux, ICMCB, UPR9048, F-33600 Pessac, France. cyril.aymonier@icmcb.cnrs.fr.
Cyril
C
Aymonier
alcohols; cerium oxide; specific surface area; supercritical fluids; thermal treatment