Silica Gel Modified Due to Pyrolysis of Acetylacetone and Metal (Ti, Cr, Co, Ni, Zn, Zr) Acetylacetonates
✍ Scribed by V.M. Gun'ko; R. Leboda; J. Skubiszewska-Ziȩba; J. Rynkowski
- Book ID
- 102584998
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 364 KB
- Volume
- 231
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Mesoporous silica gels modified due to pyrolysis of acetylacetone or acetylacetonates (AcAc) of zirconium [Zr(AcAc) 4 ], titanium [titanyl TiO(AcAc) 2 ], nickel [Ni(AcAc) 2 ], zinc [Zn(AcAc) 2 ], chromium [Cr(AcAc) 3 ], and cobalt [Co(AcAc) 2 ] were studied using nitrogen adsorption-desorption, TPD-DTG, TEM, XRD, and XRF methods. Grafted C/X phases consist of metal compounds (X denotes oxide, silicate, or metal crystallites) and pregraphite pyrocarbon, whose characteristics can be varied by changing the metal in M(AcAc) n . The structural parameters of C/X/SiO 2 , such as the specific surface area of micro-and mesopores, pore volume, pore size and fractal dimension distributions, and adsorptive ability, depend nonlinearly on the concentrations of the C/X deposit due to alterations in the topology of grafted matters with increased concentrations and a possible catalytic effect of the X phase on pyrolysis.