Improved Thermal Stability of Pt/Al2O3 Cryogels by Controlling Sol–Gel Conditions

Autor:	Saori Shima, Takeshi Miki, Toshihiko Osaki, Yutaka Tai
Rok vydání:	2012
Předmět:	Chromatography technology industry and agriculture chemistry.chemical_element Sintering General Chemistry Catalysis Metal chemistry.chemical_compound chemistry Chemical engineering Catalytic oxidation Nitric acid visual_art visual_art.visual_art_medium Thermal stability Platinum Sol-gel
Zdroj:	Catalysis Letters. 142:541-546
ISSN:	1572-879X 1011-372X
DOI:	10.1007/s10562-012-0811-7
Popis:	In order to improve thermal stability and catalytic oxidation activity of platinum–alumina cryogels prepared by one-pot sol–gel reactions and subsequent freeze drying, molar ratio of aluminum sec-butoxide, nitric acid, and water used for the sol–gel processing was optimized. It was found that the sintering of platinum at high temperatures was more remarkably suppressed at ASB:HNO3:H2O = 1:0.17:87, at the ratio of which higher CO oxidation activity was also observed. It was suggested that the suppression of sintering of the metal was attributed to smaller sizes of mesopores obtained at this ratio, retarding transfer and aggregation of platinum.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::67202526067002e4194514327adfbc56 https://doi.org/10.1007/s10562-012-0811-7 Zobrazit plný text záznamu Plný text ve formátu PDF