Alumina cryogels with superior thermal stability for catalyst supports

Autor:	Koji Tajiri, Koji Watari, Kiho Yamada, Takeshi Miki, Toshihiko Osaki, Saori Shima, Yutaka Tai
Rok vydání:	2011
Předmět:	Boehmite Materials science General Chemistry Condensed Matter Physics Electronic Optical and Magnetic Materials Catalysis Biomaterials Colloid Adsorption Materials Chemistry Ceramics and Composites Thermal stability Composite material Powder diffraction Sol-gel BET theory
Zdroj:	Journal of Sol-Gel Science and Technology. 61:268-274
ISSN:	1573-4846 0928-0707
DOI:	10.1007/s10971-011-2623-4
Popis:	Alumina cryogels were synthesized from a colloidal boehmite sol through a sol–gel processing and subsequent freeze drying, and thermal stability was examined by comparison to that of the corresponding xerogel, precipitate and commercial alumina. N2 adsorption, X-ray powder diffraction and transmittance electron micrography observations revealed that the stability was higher for the cryogel than for others in particular at temperatures above 1,000 °C. The higher stability was ascribed to the fine and uniform primary particles with fibrous shapes formed by the sol–gel technique and furthermore to the suppression of aggregation of the primary particles owing to the subsequent freeze drying. It was also found that aluminum sec-butoxide employed as a precursor for the preparation of boehmite sol was preferable compared to aluminum iso-propoxide.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::78e2ef8194093e6c73376e90f180917c https://doi.org/10.1007/s10971-011-2623-4 Zobrazit plný text záznamu Full text from SpringerLink