A NiMoS flower-like structure with self-assembled nanosheets as high-performance hydrodesulfurization catalysts

Abstract

Uniform 3D NiMoS nanoflowers with self-assembled nanosheets were successfully synthesized via a simple hydrothermal growth method using cheap and nontoxic elemental sulfur as sulfur sources. The structure and morphology of the nanomaterials were characterized by SEM, TEM, XRD, Raman and XPS analyses, revealing that the NiMoS nanoflowers were composed of ultrathin nanosheets with a thickness of approximately 6-12 nm. The HRTEM results indicate that the curve/short MoS2 slabs on the nanosheets possess the characteristics of dislocations, distortions and discontinuity, which suggests a defect-rich structure, resulting in the exposure of additional Ni-Mo-S edge sites. The obtained NiMoS nanoflowers exhibited an excellent activity for thiophene hydrodesulfurization (HDS) and 4,6-dimethyldibenzothiophene deep HDS due to their high density of active sites. The outstanding HDS performance suggests that these NiMoS composites with a unique flower-like nanostructure could be useful as promising catalysts for deep desulfurization of fuel oils.

Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

“…The binding energy peaks of Mo 3d 3/2 and Mo 3d 5/2 were located at 231.4 and 228.2 eV (Figure S5 b), respectively, whereas that of S 2p 3/2 and S 2p 1/2 peaks were located at 161.1 and 162.4 eV (Figure S5 c). These results suggest that the valence states of the Mo and S elements in the final Ni‐MoS 2 nanosheets were Mo 4+ and S 2− . It can be observed from the Ni 2p spectra shown in Figure S5 d that the Ni 2p 3/2 binding energy of 853.4 eV corresponded to the Ni in the Ni‐Mo‐S structure .…”

“…[42] X-ray photoelectron spectroscopy (XPS) was employed for investigating the chemical state of the as-made CdS/Ni-MoS 2 nanostructure. The survey scan displayed the existence of Cd, S, Mo, Ni elements in the as-prepared CdS/Ni-MoS 2 (Figure S5 [43,44] It can be observedf rom the Ni 2p spectra shown in Figure S5 dt hat the Ni 2p 3/2 binding energy of 853.4 eV corresponded to the Ni in the Ni-Mo-S structure. [45] The UV/Vis diffuse reflectance spectra (DRS) of the as-synthesized samples are shown in Figure S6, and all the photocatalysts samples gave strong absorption in the region from 200-520 nm, corresponding to the intrinsic band gap absorption of CdS nanorods.…”

Ionic liquid assisted hydrothermal synthesis of MoS2 double-shell polyhedral cages with enhanced catalytic hydrogenation activities

“…[1][2][3][4][5][6] In particular, MoS 2 -based materials have been extensively studied as effective hydrogenation catalysts for hydro-processing petroleum feed stock and upgrading heavy oil. [7][8][9][10] Up to now, supported MoS 2 catalysts have been extensively utilized for hydrogenation in a xed-bed reactor.…”

Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO3/MoS2 Hybrids for Improved‐Performance Lithium‐Ion Batteries

“…[25] The Co 2p spectrum has three clear peaks located at 776.4, 779.6, and 781.8 eV,c orresponding to CoS x ,C oMoS, and Co 2 + ,r espectively (Figure 4c). [25,26,33] Nickela nd cobalt atoms can boost the activity and conductivity of MoS 2 and MoO 3 phases based on two reasons.F irst, nickel or cobalt doping could improvet he original crystal structure of the materials and many new active sites emerget ob oost activity. [25,26,33] Nickela nd cobalt atoms can boost the activity and conductivity of MoS 2 and MoO 3 phases based on two reasons.F irst, nickel or cobalt doping could improvet he original crystal structure of the materials and many new active sites emerget ob oost activity.…”

“…[5,26,33] In NCM-NC hybrids, MoO 3 can boost the lithium-storage capacity,i nl ight of the inherently high theoretical capacity (at small current densities) and chemical stability. It is worth noting that NiÀCo skeletons with al arge specific surfacea rea provide alarger attachment surfacefor the growth of MoO 3 /MoS 2 composites, and many active sites exist for Li-ion storage.…”