Titanium Dioxide-Supported Sulfonated Low Rank Coal as Catalysts in the Oxidation of Styrene with Aqueous Hydrogen Peroxide.
Abstract
Titanium dioxide supported sulfonated low rank coal catalyst possesses high catalytic activity in liquid
phase oxidation of styrene with aqueous hydrogen peroxide at room temperature. The catalysts were
prepared by sulfonation with concentrated sulfuric acid and impregnation of titanium dioxide (500-2500
?mol). The effect of titanium dioxide impregnation and calcinations on the catalysts were studied by Xray
diffraction, UV-vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, BET
surface area, field emission scanning electron microscopy and hydrophobicity measurement. The catalytic
activity of the catalysts in the oxidation of styrene by aqueous H2O2 without calcination increased when
the amount of titanium dioxide increased. Meanwhile, the catalytic activity of the catalyst calcined at
500oC for 2 h was lower than before calcination. It is suggested that the agglomeration of titanium dioxide
and hydrophobicity play important role in the catalytic activity of titanium dioxide-supported sulfonated
low rank coal in the oxidation of styrene with aqueous H2O2.