Catalytic activity of tungsten-doped titanium dioxide-supported platinum catalysts in the sequential hydrogenolysis of glycerol: effect of support calcination temperature

Abstract

Two Pt-WO_x/TiO₂ catalysts with the same content of Pt and WO_x were prepared by impregnation-calcination method and treated with WO_x/TiO₂ supports at different temperatures, and their catalytic performance in the preparation of 1,3-propanediol (1,3-PDO) by selective hydrogenolysis of glycerol was studied. The catalysts were characterized by N₂ adsorption–desorption, CO chemisorption, Thermogravimetric analysis, X-ray diffraction, High-resolution transmission electron microscopy, NH₃-temperature-programmed desorption, H₂-temperature-programmed reduction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results showed that the Pt-WO_x/TiO₂ catalyst with high temperature treatment had the highest activity, with a glycerol conversion rate of 71.4% and a selectivity of 36.4% for 1,3-PDO at 160 °C and 4 MPa, while the catalyst treated with low temperature was only 5.2% and 10.6%. In this regard, increasing the treatment temperature of the catalyst did not change the crystalline phase structure of TiO₂, but changed the diameter structure of the catalyst pore, improved the crystallinity of the catalyst support and the dispersion of Pt particles on the surface, reduced the amount of acid in the catalyst, and enhanced the interaction between Pt, WO_x and TiO₂ in the catalyst.