A simple two-step method to synthesize the well-ordered mesoporous composite Ti-FDU-12 and its application in the hydrodesulfurization of DBT and 4,6-DMDBT

Abstract

Mesoporous FDU-12 silicas with different morphologies have been synthesized under static and stirring conditions in a water bath. Furthermore, a series of mesoporous FDU-12 silicas modified by different amounts of titania have been synthesized, through a two-step method of prehydrolysis of TEOS followed by addition of titanium butoxide as a titanium precursor. Their respective NiMo supported catalysts were also prepared and characterized to elucidate the effects of titania, on the characteristics of the Mo surface species and their hydrodesulfurization (HDS) activities on dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The composites were characterized by various techniques (XRD, SEM, TEM, FT-IR, UV-vis, 29 Si NMR, Raman, XPS and N 2 adsorption-desorption); meanwhile, the catalysts were also tested in a higher pressure HDS reactor at T ¼ 340 C and P ¼ 4 MPa with different liquid hourly space velocity (LHSV) values. The results show that the two-step synthetic route can prepare well-ordered mesoporous composites with high surface areas and large pore sizes and volumes.Obvious differences in the Mo species can be observed on the sulfided NiMo/Ti-FDU-12 catalysts. This showed that appropriate Ti loading could facilitate the dispersion of molybdena and the formation of the MoS 2 and NiMoS phases, which are the important factors for the HDS reaction. All of the catalysts presented high HDS activity, and when the Si : Ti molar ratio was increased to 5, the HDS activities on DBT and 4,6-DMDBT could reach as high as 97% and 65% respectively.

Mo‐Doped Ni3S2 Nanowires as High‐Performance Electrocatalysts for Overall Water Splitting

“…The peaks at 229 and 232.2 eV are attributed to Mo 3d5/2 and 3d3/2, respectively, proving the presence of Mo 4+ , in consistent with the previous report . The peaks located at 230.1 and 232.8 eV are attributed to the oxidation states of Mo 5+ and Mo 6+ , respectively, indicating the presence of partial molybdenum oxidation states . Furthermore, the peak at 226 eV could be associated to S 2 s .…”

Ultrasonication‐assisted Synthesis of α, β‐Unsaturated Compounds Catalyzed by Amino‐functionalized FDU‐12 Catalyst

“…The small angle powder X‐ray diffraction (XRD) patterns of FDU‐12 and FDU‐12‐NH 2 are shown in Figure a. It exhibits three characteristic peaks, which should be assigned to the (111), (220) and (311) reflections of the face‐centred cubic structure, indicating that the mesoporous FDU‐12 and FDU‐12‐NH 2 are successfully synthesized. In addition, the intensities of each peaks are similar, which suggests that the order degree of mesoporous structure does not change after grafting .…”

“…FDU‐12 is a type of ordered mesoporous silica material with the 3‐dimensional face‐centred cubic ( Fm3 m ) structure, which has been used in catalysis, oxidation and adsorption . The window size of FDU‐12 can be tailored to around 9 nm, which is favourable for the mass transfer and diffusions of guest molecules.…”

WOx‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation

“…As reported, the highly loaded Au/FDU‐12 catalyst exhibited an excellent antisintering property for the selective oxidation of alcohols . In addition, Zhao et al found that the mesoporous composite Ti‐FDU‐12 catalyst showed a high activity and stability for the hydrodesulfurization of DBT and 4,6‐DMDBT . Therefore, FDU‐12 may be a potential support for CO methanation.…”