In Situ Preparation of Mesoporous Catalyst WSiOx

Abstract

A series of mesoporous catalysts WSiOx with different tungsten contents was prepared under hydrothermal conditions using cetyltrimethyl-ammonium bromide (CTAB) as a structure-directing agent, tetraethyl orthosilicate (TEOS) as a silica source, and ammonium paratungstate as a tungsten source. The catalyst samples were characterized by X-ray diffraction (XRD), N₂ adsorption–desorption, Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) to confirm the mesoporous structure: the specific surface area of 966 m²/g, an average pore diameter of 4.68 nm, and high pore volume of 1.5 cm³/g. The catalytic performance of prepared catalysts for hydrodesulfurization (HDS) was evaluated using fluid catalytic cracked (FCC) diesel oil as feed in a high-pressure hydrogenation microreactor. The results indicated that the WxC/MCM-48 catalysts exhibited good catalytic HDS activity.