ISSN:
1573-4854
Keywords:
aerogels
;
iron oxide
;
alumina
;
chromia
;
PSD
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Mixed iron oxide-chromia-alumina aerogels were prepared by mixing a solution of iron and chromium acetylacetonates in methyl alcohol with a solution of aluminum tri-sec-butoxide in 2-butanol followed by hydrolysis and supercritical drying. The resultant aerogels were highly porous, weak monoliths that easily broke into fine porous particles. Addition of 8% Fe or 2% Cr to the aluminum precursor solution increased the surface area of the resultant alumina aerogel from 400 m2/g to 500 and 600 m2/g respectively. These materials have significant pore volume as judged by the amount of N2 adsorbed at liquid nitrogen temperatures (range of 400 to 1,100 cm3 N2/g at P/P0 = 0.9). Post treatments of oxidation or reduction also increased the porosity of the aerogels to values as high as 2,500 cm3 N2/g. It then appears that small percentages of foreign cations (Fe, Cr) can increase significantly the porosity of a material like an alumina aerogel.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1009680701009
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