Premium
Synthesis of Solid, Spherical CeO 2 Particles Prepared by the Spray Hydrolysis Reaction Method
Author(s) -
Xu Huarui,
Gao Lian,
Gu Hongchen,
Guo Jingkun,
Yan Dongsheng
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00055.x
Subject(s) - oxalic acid , hydrolysis , pyrolysis , nucleation , precipitation , chemistry , oxalate , chemical engineering , cerium , salt (chemistry) , spray drying , inorganic chemistry , materials science , chromatography , organic chemistry , physics , meteorology , engineering
To avoid the formation of hollow particles during spray pyrolysis, a spray hydrolysis reaction method (SHRM) was studied. Unlike the conventional spray pyrolysis that uses metal salt as a precursor and dry air as a carrier gas, the SHRM introduces a mixture of metal salt and dimethyl oxalate (DMO) as precursors and a gas mixture of water vapor and air as the carrier gas. Spherical, solid CeO 2 particles characterized by SEM, BET, and density analysis were produced by the SHRM using Ce(NO 3 ) 3 and DMO as the precursors. DMO, as an internal precipitant, hydrolyzed and produced oxalic acid, which precipitated with cerium ions to form volume precipitation in the whole droplet at enough temperature and relative humidity. The volume precipitation induced by the in situ formation of oxalic acid in the whole droplet prevented Ce(NO 3 ) 3 nucleation at the droplet surfaces, thus avoiding the formation of hollow particles which usually occur in the conventional spray pyrolysis process. XRD and IR analysis showed that cerium oxalate was an intermediate product in the SHRM process.