CoMo/Ti-MCM-41/Alumina Catalysts: Properties and Activity in the Hydrodesulfurization (HDS) of Dibenzothiophene (DBT)

Abstract

The objective of this work is to study the experimental synthesis of Co-Mo catalysts supported on Ti-MCM-41/alumina. The mixing process of alumina and Ti-MCM 41 and the resulting effects on mechanical and textural properties of the final catalyst were studied. MCM-41 was synthesized according to methods previously reported in the literature. An alumina matrix was obtained from the thermal treatment of pseudo-boehmite. Cylindrical extrudate support was prepared by physical mixture of Ti-MCM-41 and boehmite. Co and Mo were incorporated into the support by simultaneous impregnation. The catalysts were characterized by textural properties, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Catalytic activity tests were conducted in a differential reactor using the hydrodesulfurization (HDS) of dibenzothiophene (DBT) as the model reaction. Reaction products were analyzed via online gas chromatography (GC). The integration of Ti-MCM-41 with alumina resulted in a support with suitable textural and mechanical properties, such as those required for commercial application. The results of HDS of DBT indicated that Co-Mo supported on Ti-MCM-41/alumina catalyst exhibits activity that is very similar, in comparison, to that of a typical commercial catalyst.

One pot synthesis of NiMo–Al2O3 catalysts by solvent-free solid-state method for hydrodesulfurization

“…However, the selectivity of BP produced via the DDS pathway is much higher than that of CHB and DCH formed through the HYD route, which was similar to the ndings of previous studies. 30 This feature should be due to the low hydrogen pressure and high liquid hourly space velocity (LHSV).…”

Fast synthesis of mesoporous γ-alumina assisted by a room temperature ionic liquid and its use as a support for the promotional catalytic performance of dibenzothiophene hydrodesulfurization

“…In the past years, cobalt or nickel promoted molybdenum suldes have been successfully developed as the active species for commercial HDS of DBT. [45][46][47][48] As commonly used alumina supported HDS catalysts, it was well known that increases in anion vacancies or dispersion and alteration of metal-support interactions were oen favorable to an increase in activity. 49 Nevertheless, the inuence of the textural properties of the support on catalytic performance was scarcely reported.…”

Desulfurization Kinetics and Regeneration of Silica Gel-Supported TiO2 Extrudates for Reactive Adsorptive Desulfurization of Real Diesel

“…Herein, the powdered TiO 2 /SiO 2 was shaped into extrudates featuring ultrahigh loading of up to 95% using pseudo-boehmite as a binder. − The desulfurization kinetics and regeneration of TiO 2 /SiO 2 extrudates for RADS of real low-sulfur diesel (∼50 ppm-S) were explored. The desulfurization kinetics of extrudates at varied particle sizes were studied in static reactors, and the data were further modeled.…”