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- W1574152068 abstract "Mesoporous chromia aerogels with a surface area of 484-735 m2g-1 a pore volume of 0.4- 0.9 cm3 g-1 and a pore diameter of 3-9 nm were prepared by urea-assisted homogeneous precipitation from an aqueous Cr(NC3)3 solution, followed by continuous supercritical CO2 extraction. The aerogels were characterized by means of N2-adsorption isotherms, AA, HR- TEM, FTIR, thermoanalytical methods TPD, TPO, DSC and X-ray diffraction in combination with structure modeling. For production of mesoporous aerogels with surface areas > 700 m2g-1was required Pco2 of ≈ 400 bar. The chromia aerogels consisted of 3 to 5 nm nanoparticles representing a monoclinic analogue of α-CrOOH in which half the O atoms and OH groups were replaced with coordinately bonded water molecules. After dehydration at 550-600 K the materials retained their texture, being converted to two-dimensional fragments (clusters) of α -CrOOH crystals built on [Cr(OH)3O3] octahedra without bonding along the Z- axis (N2, vacuum) or to amorphous CrO2 (air). At temperatures of >650 K in air and of > 773 K in an inert atmosphere, the material was converted to a-Cr2O3 with 50-nm particles ." @default.
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- W1574152068 date "2003-01-01" @default.
- W1574152068 modified "2023-10-10" @default.
- W1574152068 title "Texture of chromia aerogels and structure of their nanocrystals" @default.
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- W1574152068 doi "https://doi.org/10.1016/s0167-2991(03)80373-7" @default.
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