HDS of 4,6-dimethyldibenzothiophene over CoMoS supported mesoporous SiO2-TiO2 materials

Abstract

TiO 2 supported SBA-15 (xTi@SBA-15) materials with various high TiO 2 loadings (x=25, 50 and 70 wt%) have been used as support for impregnation of CoMo active phase for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (46DMDBT) as model molecule representative of gazole cuts. Compared to CoMoS supported over pure commercial TiO 2 and conventional Al 2 O 3 , a higher total activity was measured corresponding to the presence of isomerization and dismutation reactions due to Brönsted acidity of TiO 2. However, the HDS activity remains higher using alumina as support. Moreover, the DDS pathway was found favored to the HYD one with sulfided CoMo supported over xTi@SBA-15 catalysts contrary with alumina as support.

Trimetallic Catalyst Supported Zirconium-Modified Three-Dimensional Mesoporous Silica Material and Its Hydrodesulfurization Performance of Dibenzothiophene and 4,6-Dimethydibenzothiophene

“…Moreover, the HDS reaction of 4,6-DMDBT can proceed through the ISO path since a certain amount of 4,4′-DMBCH and Iso-MIPT is detected in the final hydrogenation products. Furthermore, according to the selectivity of 3,3′-DMBP less than 15%, it can be deduced that hydrodesulfurization of 4,6-DMDBT via the DDS path is relatively hard, which is consistent with other reports. , …”

“…Currently, scientific researchers have made a lot of attempts in developing hydrodesulfurization catalysts with outstanding catalytic performances, mainly focusing on the application of novel supports with excellent performance and the preparation of active phases with different structures. So far, various materials (composite metallic oxide, grapheme, and mesoporous silica) as the supports have been tested for their catalytic performance. − By contrast, mesoporous silica materials, the typical representatives of which are HMS, SBA-15, and FUD-12, have attracted much attention due to the open and ordered channel, high specific surface area, and easy surface modification. − However, the low acid sites and weak interaction with active metals are unfavorable for their application in catalysis. The studies demonstrate that embedding Al 3+ , Ti 4+ , and Zr 4+ into the mesoporous silica materials is an effective method to improve catalytic performances. − Pawelec and co-workers studied the hydrodesulfurization (HDS) reaction network of 4,6-DMDBT molecules on CoMo/P/Ti-HMS catalysts with different preparation methods (simultaneous and successive impregnation) .…”

Advances of isomerizing-hydrogenating properties of CoMo catalysts supported on ASA-Al2O3

“…Currently, the vast majority of hydroprocessing catalysts consist of sul de active phase supported on porous carrier [7][8][9]. Gamma-aluminum oxide is usually used as a support due to its almost complete inertness to reactions occurring in the process, relatively low cost and the ability to adjust its textural and strength characteristics [10][11][12].…”

Magnetic Fe3O4@SiO2–Pt and Fe3O4@SiO2–Pt@SiO2 Structures for HDN of Indole

“…Taking into account the different elements that are considered contaminants in the refining processes of the petrochemical industry, within hydrotreatment we can distinguish hydrodesulfurization (HDS), hydrodenitrogenation (HDN), hydrodeoxygenation (HDO), hydrodemetalization (HDM), and hydrodearomatization (HDA). The HDS has been extensively studied because sulfur is a pollutant that is present in higher proportions in crude oils of lower quality and also as an important catalyst deactivator because of poisoning [5,6,7,8,9]. However, removal of nitrogen from organic compounds present in various fractions of crudes is harder than sulfur removal, which leads to the importance of the study of the HDN reaction.…”

“…In this sense, the support materials have been the protagonists of various studies. Among the most studied are metal oxides, such as Al 2 O 3 [4,5,6,7,8,9], and materials with different degrees of porosity, such as MCM (Mobil Composition of Matter), SBA, Santa Barbara Amorphous type material and zeolites [10,11,12,13,14,15,16,17,18].…”