Nanocrystalline Sulfided NiMoW Catalyst Supported on Mesoporous Aluminas for the Hydrodesulfurization of 4,6-Dimethyldibenzothiophene

0570566 - ÚCHP 2024 RIV CH eng J - Journal Article
Palcheva, R. - Kaluža, Luděk - Petrova, T. - Dimitrov, L. - Karashanova, D. - Tyuliev, G. - Jirátová, Květa
Nanocrystalline Sulfided NiMoW Catalyst Supported on Mesoporous Aluminas for the Hydrodesulfurization of 4,6-Dimethyldibenzothiophene.
Crystals. Roč. 13, č. 3 (2023), č. článku 543. ISSN 2073-4352. E-ISSN 2073-4352
Institutional support: RVO:67985858
Keywords : Mo(W)S2 nanocrystals * sol-gel synthesis * hydrothermal synthesis
OECD category: Chemical process engineering
Impact factor: 2.7, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2073-4352/13/3/543

Tri-metallic NiMoW catalysts prepared by impregnating mesoporous aluminas (pore sizes of ~9 nm and surface areas of ~225 m2/g) obtained by sol-gel (NiMoW/Al) and hydrothermal (NiMoW/AlHYDT) processes were investigated in the hydrodesulfurization (HDS) of thiophene and
4,6-dimethyldibenzothiophene (4,6-DMDBT) at H2 pressures of 1 MPa and 5.0 MPa, respectively. The supports and catalysts were characterized by N2 physisorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-VisDRS), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), and high resolution transmission electron microscopy (HRTEM). The NiMoW/AlHYDT catalyst, which was the most active in both test HDS reactions, was characterized by a pore size of 7.5 nm, whereas the pore
size of the catalyst on sol-gel alumina (NiMoW/Al) was only 4.8 nm. Moreover, the NiMoW/AlHYDT catalyst exhibited reduction peaks shifted to a lower temperature during TPR, indicating weaker metal support interactions, a higher degree of Mo (79%) and W (48%) sulfidation, and an optimal
layer slab length distribution of Mo(W)S2 nanocrystals preferentially between 2–4 nm with an average layer stacking of 1.7 compared to the NiMoW/Al counterpart.
Permanent Link: https://hdl.handle.net/11104/0341867