Effects of pore size, mesostructure and aluminum modification on FDU-12 supported NiMo catalysts for hydrodesulfurization

Abstract

A series of NiMo/FDU-12 catalysts with tunable pore diameters and mesostructures have been controllably synthesized by adjusting the synthetic hydrothermal temperature and applied for the hydrodesulfurization of dibenzothiophene and its derivative. The state-of-the-art electron tomography revealed that the pore sizes of FDU-12 supports were enlarged with the increase in the hydrothermal temperature and the mesostructures were transformed from ordered cage-type pores to locally disordered channels. Meanwhile, the MoS 2 morphology altered from small straight bar to semibending arc to spherical shape and finally to larger straight bar with the change of support structures. Among them, FDU-12 hydrothermally treated at 150 °C possessed appropriate pore diameter and connected pore structure and was favorable for the formation of highly active MoS 2 with curved morphology; thus, its corresponding catalyst exhibited the best HDS activity. Furthermore, it was indicated that the isomerization pathway could be significantly improved for HDS of 4,6-dimethyldibenzothiophene after the addition of aluminum, which was expected to be applied to the removal of the macromolecular sulfur compounds. Our study sheds lights on the relationship between support effect, active sites morphology and HDS performance, and also provides a guidance for the development of highly active HDS catalysts.

Deep Adsorption Desulfurization of Fluid Catalytic Cracking Light Gasoline on NiO/ZnO-TiO2 Adsorbents with a High Breakthrough Sulfur Capacity

“…The sulfides in gasoline usually include mercaptan, thioether, thiophene, and their derivatives. 6 − 8 Mercaptans and thioethers can be removed through traditional desulfurization technologies such as hydrodesulfurization (HDS) 9 − 11 and non-hydrodesulfurization. 12 , 13 Thiophene, however, is difficult to remove through traditional hydrodesulfurization because the conjugate structure formed by coplanar carbon and sulfur atoms makes the C–S bond difficult to break.…”

“…The sulfides in gasoline usually include mercaptan, thioether, thiophene, and their derivatives. − Mercaptans and thioethers can be removed through traditional desulfurization technologies such as hydrodesulfurization (HDS) − and non-hydrodesulfurization. , Thiophene, however, is difficult to remove through traditional hydrodesulfurization because the conjugate structure formed by coplanar carbon and sulfur atoms makes the C–S bond difficult to break. ,, Additionally, the traditional desulfurization process is usually accompanied by olefin hydrogenation, which will lead to a reduction in gasoline octane number. − Thus, new ultradeep desulfurization technologies are needed to produce clean gasoline. , An S-Zorb process developed by Conoco Phillips Co. is a widely used technology for producing ultralow-sulfur full-range gasoline . This process combines the advantages of HDS and adsorption desulfurization, which can effectively remove sulfur compounds through reactive adsorption desulfurization (RADS) using Ni/ZnO-based adsorbents while maintaining the octane number. − …”

Desulfurization of Initial Sulfur Compounds in Diesel Fuel by Oxidation-Emulsification Processes

“…The most widely used method for sulfur removal is hydrogenation, which requires severe working conditions and an expensive catalyst [8]. Hydrodesulfurization (HDS) has been used in industry for a long time because it is extremely effective in removing thiols, sulfides, and disulfides from fuels [9].…”