title: Silica Gel Modified Due to Pyrolysis of Acetylacetone and Metal (Ti, Cr, Co, Ni, Zn, Zr) Acetylacetonates.
abstract: 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. Copyright 2000 Academic Press.
authors.affiliation: Institute of Surface Chemistry, 31 Prospect Nauki, Kiev, 03680, Ukraine
authors.initials: VM
authors.lastname: Gun'ko
authors.initials: R
authors.lastname: Leboda
authors.initials: J
authors.lastname: Skubiszewska-Zi&ecedil;ba
authors.initials: J
authors.lastname: Rynkowski