Superior thermal stability and oxygen storage capacity of ceria nanoparticles dispersed on alumina cryogel

Autor:	Koji Tajiri, Koji Watari, Kiho Yamada, Toshihiko Osaki
Rok vydání:	2014
Předmět:	Boehmite Materials science Inorganic chemistry chemistry.chemical_element Sintering Nanoparticle Catalysis Cerium nitrate Cerium chemistry.chemical_compound chemistry Chemical engineering Thermal stability Physical and Theoretical Chemistry Sol-gel
Zdroj:	Reaction Kinetics, Mechanisms and Catalysis. 114:561-570
ISSN:	1878-5204 1878-5190
DOI:	10.1007/s11144-014-0804-1
Popis:	Cerium-dispersed alumina cryogel was prepared from cerium nitrate and aluminum sec-butoxide by a combination of one-pot sol–gel with freeze drying. The cryogel catalyst exhibited higher thermal stability of ceria and larger oxygen storage capacity than the corresponding xerogel and impregnation catalysts. The better stability and capacity were owing to the homogeneous distribution of cerium in boehmite gel by the one-pot synthesis of cerium-boehmite gel, and also to the suppression of aggregation of the cerium during the subsequent elimination of water from frozen gel by sublimation. As a result, cerium was finely dispersed and stabilized throughout the alumina cryogel, retarding the sintering of ceria at high temperatures. The destruction of fine structures of the catalyst at high temperatures was less pronounced on the cryogel, which also contributed to the stability of ceria.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d09eb2fce81541584f028bcc995e1f41 https://doi.org/10.1007/s11144-014-0804-1 Zobrazit plný text záznamu Full text from SpringerLink