A novel approach for modulating the morphology of supported metal nanoparticles in hydrodesulfurization catalysts

Abstract

This article proposes a novel cetyltrimethylammonium bromide-and fluorine-assisted hydrothermal deposition method for modulating the morphology of supported metal nanoparticles in NiWF/Al 2 O 3 hydrodesulfurization (HDS) catalysts. The proposed approach significantly promotes the dispersion of supported W species by bridging and anchoring the precursor of W species onto the surface of fluorinated Al 2 O 3 as well as restraining the subsequent aggregation of W species in calcination. The dual effects of the improved dispersion and F-enhanced stacking endow the corresponding catalyst with superior morphology featured by sufficient and accessible Ni-W-S active phases and thereby with a remarkably promoted HDS performance as compared to its counterpart prepared by the conventional impregnation method. We successfully demonstrate the roles of the cetyltrimethylammonium bromide-and fluorine-assisted hydrothermal deposition method in tuning the morphology of supported metal nanoparticles in HDS catalysts, shedding light on the rational design and fabrication of supported metal sulfide catalysts.

Conversion of γ‐Valerolactone to Ethyl Valerate over Metal Promoted Ni/ZSM‐5 Catalysts: Influence of Ni0/Ni2+ Heterojunctions on Activity and Product Selectivity

“…In addition to the surface Ni species, the nature of promoter species (Cr, Mo and W) on the catalyst surface has also been investigated by XPS (Figure S3) . The surface composition obtained from XPS analysis revealed a relatively high ratio of Mo/Si as compared to Cr/Si and W/Si ratios (Table S1).…”

Supported NiW catalysts with tunable size and morphology of active phases for highly selective hydrodesulfurization of fluid catalytic cracking naphtha

“…Fig. 3B shows that no diffraction peak attributed to the bulk NiO phase is observed in the XRD patterns, possibly because of the high dispersion of NiO particles, whose size is <4 nm and thus beyond the detectability of XRD [42].…”

“…The textural parameters of the above samples are listed in Table 1. It can be seen that compared with c-Al 2 O 3 , the HNC-Al 2 O 3 composite has a decreased average pore diameter and pore volume, also indicating the successful deposition of W-based HNCs into the pore channels of c-Al 2 O 3 [42]. W-HHD, obtained by drying and calcining the HNC-Al 2 O 3 composite, has a larger pore volume and average pore diameter than its precursor, due to the decomposition of the organic shells of W-based HNCs during the calcination step.…”

“…In summary, the superior physicochemical properties of the HHD-derived catalyst originate from the transformation of POT anion clusters into W-based HNCs, which have the following two modification effects: and prevents the eggshell distribution of the active phase in the resulting oxidic catalysts. In both the drying and calcination processes, TEA + alkyl chains are beneficial to the even distribution of the active components in the final supported catalysts [42].…”

The Conversion of Jatropha Oil into Jet Fuel on NiMo/Al‐MCM‐41 Catalyst: Intrinsic Synergic Effects between Ni and Mo

“…Although noble metal catalysts had an eminent catalytic performance, the high cost and low abundance hampered their large‐scale application. Therefore, conventional hydrodesulfurization catalysts, such as sulfided Ni–W, Co–Mo, and Ni–Mo catalysts, were widely studied in the deoxygenation process . Verma et al reported a route to produce aviation fuel with a sulfided Ni–Mo catalyst on a ZSM‐5 support at 410 °C and 50 bars, where a 54% yield of jet‐fuel range alkanes was obtained.…”