Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Bui, Ngoc-Quynh; Geantet, Christophe; Berhault, Gilles

doi:10.1016/j.jcat.2015.07.031

Cited by 60 publications

(37 citation statements)

References 75 publications

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“…The HDS activities of the catalysts change in the order of Zn 0.75 Mg 0.25 Ni-P/Al 2 O 3 > Ni-P/Al 2 O 3 > Ni-P/ZnO > Ni-P/MgO. Compared with the widely-studied Ni-P/Al 2 (Figure 2). As reported, Ni 2 P has two types of sites, including tetrahedral Ni(1) sites and square pyramidal Ni(2) sites, which are responsible for HDS by the DDS route and desulfurization by the HYD route, respectively [27].…”

Section: Catalystmentioning

confidence: 94%

“…Clearly, all catalysts almost have the same pore volume. The Zn 0.75 Mg 0.25 Ni-P/Al 2 O 3 has significantly higher specific surface area, but significantly smaller pore diameter and narrower pore size distribution (mainly concentrated in 2.3 nm) compared with ZnNi-P/Al 2 Figure 4 shows the X-ray photoelectron spectroscopy (XPS) spectra of Zn x Mg 1−x Ni-P/Al 2 O 3 , and the corresponding binding energies and surface composition are listed in Table 3. For Zn x Mg 1−x Ni-P/Al 2 O 3 , the peaks at 852.2-853.7 and 129.2-129.6 eV are assigned to Ni δ+ (0 < δ < 2) and P δ− (0 < δ < 1) [14] (Figure 4a), respectively.…”

Section: Characterization Of Catalystsmentioning

confidence: 96%

“…The XRD patterns of different nickel phosphate catalysts are shown in Figure 5. For Ni-P/Al 2 Figure 5. The XRD patterns of different nickel phosphate catalysts.…”

Section: Catalystmentioning

confidence: 99%

“…Sulfur removal has gained growing attention since the stringent fuel standards have been enacted throughout the world [1,2]. Among the existing sulfur removal methods, catalytic hydrodesulfurization (HDS) is a very efficient way to eliminate sulfur from fuel oil [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…For comparison, Ni-P/Al 2 3 . After evaporation, the resulting solids were calcined, and reduced by heating to 873 K at a rate of 2 K/min in a H 2 flow.…”

mentioning

confidence: 99%

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High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

et al. 2017

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A series of ZnMgNiAl layered double hydroxides (LDHs) containing 20 wt.% Ni and different Zn/Mg molar ratios were prepared by a coprecipitation method, and then were introduced with H 2 PO 4 − via a microwave-hydrothermal method. With the resulting mixtures as the precursors, Zn/Mg-modified ZnMgNi-P/Al 2 O 3 catalysts were prepared. The Zn/Mg molar ratio affected the formation of Ni 2 P and Ni 12 P 5 in nickel phosphides. The ZnMgNi-P/Al 2 O 3 catalyst with a Zn/Mg molar ratio of 3:1 exhibits the best dibenzothiophene hydrodesulfurization (HDS) activity. Compared with the Ni-P/Al 2 O 3 catalyst prepared from the impregnation method, the ZnMgNi-P/Al 2 O 3 catalyst shows a higher HDS activity (81.6% vs. 54.3%) and promotes the direct desulfurization of dibenzothiophene.

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Section: Catalystmentioning

confidence: 94%

Section: Characterization Of Catalystsmentioning

confidence: 96%

“…The XRD patterns of different nickel phosphate catalysts are shown in Figure 5. For Ni-P/Al 2 Figure 5. The XRD patterns of different nickel phosphate catalysts.…”

Section: Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…For comparison, Ni-P/Al 2 3 . After evaporation, the resulting solids were calcined, and reduced by heating to 873 K at a rate of 2 K/min in a H 2 flow.…”

mentioning

confidence: 99%

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High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

et al. 2017

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Towards Understanding Structure–Activity Relationships of Ni–Mo–W Sulfide Hydrotreating Catalysts

et al. 2016

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The relation between activity and selectivity of a series of unsupported Ni–Mo, Ni–W, and Ni–Mo–W sulfides and the physicochemical properties of the sulfides and oxide precursors were explored. Bimetallic oxide precursors were a crystalline molybdate with layered structure ((NH4)HNi2(OH)2(MoO4)2) or a wolframite‐type nickel tungstate (NiWO4). Trimetallic precursors were mixed Mo–W–Ni phases appearing amorphous in XRD analysis, in which metal cations had environments similar to those in the bimetallic precursors. The XRD‐amorphous layered structure (obtained for a Ni–Mo–W precursor) led to the fastest sulfidation of Ni cations. The proximity of metal cations in precursors was retained after sulfidation, which lead to intralayer mixed Mo1−xWxS2 (in trimetallic materials) and varying concentrations of Ni at the perimeter of the Mo(W)S2 slabs. At MoS2 and WS2 edges, Ni has a square‐pyramidal coordination, which is significantly distorted at the Mo–W mixed edges. The catalyst with the lowest Mo/W–Ni coordination had the lowest rates for hydrodenitrogenation of o‐propylaniline and hydrodesulfurization of dibenzothiophene. Among the materials with significant Ni–Mo(W) coordinations, the most active sulfide catalyst at low temperatures was Ni–W with highly defective slabs, at high temperatures the Ni–Mo–W sulfide with the highest Ni concentration at the perimeter was the most active catalyst.

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The Pivotal Role of Catalysis in France: Selected Examples of Recent Advances and Future Prospects.

et al. 2017

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Maleic acid, an efficient additive for the activation of regenerated CoMo/Al2O3 hydrotreating catalysts

Cited by 60 publications

References 75 publications

High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

High Active Zn/Mg-Modified Ni–P/Al2O3 Catalysts Derived from ZnMgNiAl Layered Double Hydroxides for Hydrodesulfurization of Dibenzothiophene

Towards Understanding Structure–Activity Relationships of Ni–Mo–W Sulfide Hydrotreating Catalysts

The Pivotal Role of Catalysis in France: Selected Examples of Recent Advances and Future Prospects.

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