Sol–gel iron complex catalysts supported on TiO2 for ethylene polymerization

Effects of surface hydroxyl group density on the photocatalytic activity of Fe3+-doped TiO2

“…The spectra revealed the stretching vibrations of the O-H is located around 3437 cm À1 , the C-O band located at 1200 cm À1 [53], and a wide range of bands from 470 to 750 cm À1 , which includes Ti-O (647 cm À1 ) and Ti-O-Ti (525 cm À1 ) [54]. There was a small band associated with the carbon-carbon double bond located at 1635 cm À1 [14], and a strong absorption band is located at 1384 cm À1 due to the bending vibrations of the C-H bond in the catalysts [10]. The strength of the C-H bond decreases by increasing the Fe 3+ -doping levels from undoped TiO 2 to 0.50%-Fe 3+ -TiO 2 .…”

“…For the purpose of improving optical absorption and photocatalytic activity, all kinds of attempts have been made to extend the light absorption toward the visible light range and to prohibit the recombination of electron-hole pairs. Many techniques have been reported to shift the absorption wavelength toward the visible region such as doping the transition metals [10][11][12][13][14][15][16][17], noble metals [18,19], non-metal materials [20][21][22], rare earth metals [23][24][25] and other materials [26,27] into titanium dioxide, in which Fe 3+ -doped TiO 2 photocatalysts show a relatively high level of photocatalytic activity under visible-light irradiation.…”

Palladium(II) complexes bearing the new pincer ligand 3,5-bis(indazol-2-ylmethyl)toluene; synthesis and catalytic properties

“…GPC analysis of the resulting polymers shows high molecular weights (M w ), with a monomodal molecular weight distribution (M w /M n ) that corresponds to a single-site catalyst. As to the thermal properties, DSC analysis showed melting points in the 134-135°C range, indicating the absence of branching in the polymer chain, as confirmed by the FTIR spectra, which show the [15].…”

Ethylene/1-Hexene Copolymerization over Different Phases Titania-Supported Zirconocene Catalysts

“…The larger size of nano-titania particle was used, the greater catalytic activity was obtained. Also, Domínguez A.M. et al [19] prepared (Fe(SO4)2(NH4)2)/TiO2 catalyst for ethylene polymerization and revealed that titania surface still remained a lot of hydroxyl group after calcination at high temperature, which have an effect on the metal complex anchoring. It is known that the hydroxyl group on the support surface plays a significant role in catalytic activity.…”