Premium
Effect of Thermal Treatment on the Textural Properties of CeO 2 Powders Synthesized in Near‐ and Supercritical Alcohols
Author(s) -
Slostowski Cédric,
Marre Samuel,
Babot Odile,
Toupance Thierry,
Aymonier Cyril
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500570
Subject(s) - crystallite , supercritical fluid , cerium oxide , thermal treatment , materials science , alcohol , chemical engineering , nanocrystal , specific surface area , oxide , catalysis , perovskite (structure) , nanotechnology , organic chemistry , chemistry , composite material , metallurgy , engineering
CeO 2 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 CeO 2 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‐ i PrOH 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.