Silica Gel Modified Due to Pyrolysis of Acetylacetone and Metal (Ti, Cr, Co, Ni, Zn, Zr) Acetylacetonates

Structural and Energetic Nonuniformities of Pyrocarbon–Mineral Adsorbents

“…microphotographs of the CS samples (3,4,7). For example, more nonuniform and denser carbon deposits are observed for CS Ti and the opposite result is for CS Zn , which can be caused by the difference not only in the catalytic impact of the X phase on the pyrolysis but also in features of pyrocarbon distributions.…”

“…It should be noted that the use of Hill's approximation for Eq. [4] (43) gives only slight changes in f (R p ) (Fig. 5c); besides, the PSDs for microporous carbons computed using Eq.…”

“…The w value in Eqs. [3] and [4] is determined by the dependence of dV /d S on R p , which, e.g., corresponds to R p /2 for cylindrical pores (8). It should be noted that Eqs.…”

“…For fumed oxides with spherical primary particles (or pyrocarbon with spherical particles), Eq. [4] should be replaced by (8) ln…”

“…Mesoporous silica gel KSK-2 (Russia) was utilized to prepare titania-silica gel (CVD-TSG) adsorbents by means of the chemical vapor deposition (CVD) technique (16) for TiCl 4 chemisorbed and hydrolyzed at 473 K (K28) and 873 K (K68 , Table 4) using eight cycles of the chemisorption hydrolysis. Carbon-oxide samples were synthesized using pyrolysis of cyclohexene at the silica gel (K03) and CVD-TSG (K282, K682) surfaces at a constant partial pressure 51.3 mm Hg in a flow reactor under isothermal conditions and gravimetric control at 973 K for 5 h (Table 4) (2,17).…”