A method for preparing a titanium dioxide catalyst and its application in catalyzing polyester synthesis

Abstract

This invention discloses a method for preparing a titanium dioxide catalyst and its application in catalytic polyester synthesis, belonging to the field of polyester synthesis technology. This invention uses TiCl4 as the titanium source and tartaric acid as the complexing agent to form a homogeneous solution at 5-30℃, avoiding the use of strong acids / bases in traditional hydrolysis methods. The dispersion of TiO2 particles is controlled by an ethanol / cyclohexane mixed solvent, and reflux reaction promotes uniform nucleation. Finally, calcination is performed at 350-450℃ under nitrogen protection to carbonize the tartaric acid, forming a porous structure, while simultaneously inhibiting the transition of the crystal form to the rutile phase and retaining highly active crystal faces. The obtained titanium dioxide catalyst has a particle size of 20-200 nm and a specific surface area of ​​50-200 m². 2 This catalyst, at / g, exhibits high activity and selectivity when used to catalyze the synthesis of polyesters such as PET, PBT, PTT, and PBS. Furthermore, its preparation method is simple, low-cost, and environmentally friendly, making it suitable for industrial production.