Aging of Co(Ni)MoP/Al2O3 catalysts in working state

Guichard, Bertrand; Roy-Auberger, Magalie; Devers, Élodie; Legens, C.; Raybaud, Pascal

doi:10.1016/j.cattod.2007.09.007

Cited by 78 publications

(58 citation statements)

References 17 publications

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“…Since the line-shape of the Ni 2p 3/2 peak, and especially its satellite, was unsymmetrical and broad, we applied an empirical method to roughly fit the curve using Gaussian/Lorentzian distributions. For all samples, the Ni 2p 3/2 main binding energies are observed at about 852.4 eV and 855.3 eV suggesting that Ni 2+ is present on the catalyst surface as Ni-S (probably Ni 3 S 2 ) and Ni-O oxides, respectively, according to previous reports [42][43]. From the areas of sulfided and oxidic nickel species it is evident that Cat-P1.5 and Cat-P2.0 catalysts show, in agreement with the FTIR spectra of NO (cf.…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 70%

“…For the Mo 3d core-level spectra, curve fitting procedure revealed the presence of two Mo 3d doublets: a major one with the BE values at 228.9 eV fits well with that expected for MoS 2 species, and a minor one about 231.2 eV ascribed to unsulfided (Mo-O) and/or partially sulfided (O-Mo-S) species probably located at the support interface [42][43].…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 53%

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Competitive HDS and HDN reactions over NiMoS/HMS-Al catalysts: Diminishing of the inhibition of HDS reaction by support modification with P

Zepeda¹,

Pawelec

Obeso–Estrella³

et al. 2016

Applied Catalysis B: Environmental

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Graphical abstract Abstract Individual and simultaneous hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrodenitrogenation (HDN) of carbozole reactions have been studied in the presence of hydrogen (P=55 bar) at 310 ºC in a batch reactor over a series of sulfided NiMo/P/Al-HMS catalysts modified with phosphorus (0.5-2.0 wt.%). Both oxidic precursors and sulfide catalysts have been characterized by specific surface area, XRD, Raman, TPD-NH 3 , HRTEM, XPS and IR spectroscopy of adsorbed pyridine.Regardless of the reaction studied, all P-containing catalysts showed higher activity than that to the P-free one. The catalyst modified with optimized amount of P (1 wt.%) the best HDS activity and exhibited a lowest inhibition factor during simultaneous HDS and HDN, which was close to that of a commercial NiMo/Al 2 O 3 sulfide catalyst. This was linked with formation of irregular MoS 2 structures having high concentration of brim sites as well as with its largest total acidity.

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Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 70%

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 53%

Competitive HDS and HDN reactions over NiMoS/HMS-Al catalysts: Diminishing of the inhibition of HDS reaction by support modification with P

Zepeda¹,

Pawelec

Obeso–Estrella³

et al. 2016

Applied Catalysis B: Environmental

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“…For Ni, we found 3 different species on the catalysts referred to Ni(II) oxide as present on the oxide mono metallic catalyst with a main binding energy position at 856.0 ± 0.1 eV [18]. The same reference after sulfidation showed another contribution named Ni sulfide (NiS x ) (as it was difficult to define the exact stoechiometry) with the main Ni 2p 3/2 position at 853.1 ± 0.1eV.…”

Section: Xps Analysismentioning

confidence: 90%

“…However, it was also shown by DFT calculations that the more numerous Coordinatively Unsaturated Sites (CUS) present at the M-edge of Co(Ni)MoS crystallite in HDS conditions promote the adsorption energy of various reactant compounds [10,11], including toluene molecules [9] and even polyaromatic coumpounds [18]. Hence, one predominant effect distinguishing the catalytic behavior of MoS 2 , CoMoS and NiMoS active phases in the hydrogenation of aromatic compounds is expected to be controlled by the number and nature of promoter present at the M-edge.…”

Section: Tablementioning

confidence: 99%

A Rational Comparison of the Optimal Promoter Edge Decoration of HDT NiMoS vs CoMoS Catalysts

Marchand

Legens

Denis

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Étude comparative de la décoration optimale par le promoteur des phases CoMoS et NiMoS actives en hydrotraitement -Dans le but d'acquérir une meilleure compréhension de la morphologie et la teneur en promoteur de la phase active des catalyseurs d'hydrotraitement dans les conditions de l'hydrotraitement, une étude multi-technique a été entreprise sur une série de catalyseurs NiMoP avec des ratios Ni/Mo variables. La combinaison de la spectroscopie photoélectronique-X, de la microscopie électronique à transmission, de la modélisation moléculaire ab initio et de tests catalytiques d'hydrogénation du toluène a permis d'aboutir à un modèle morphologique qui a été comparé à une précédente étude menée sur une série analogue promue par le cobalt. Cette étude confirme l'importance de la présence de sites mixtes Ni-Mo sur les bords des cristallites, en particulier sur le bord M-edge pour les réactions d'hydrogénation. Ces résultats permettent d'orienter la mise au point de nouveaux catalyseurs dans le but de maximiser leurs performances. Abstract -A Rational Comparison of the Optimal Promoter Edge Decoration of HDT NiMoS vs CoMoS Catalysts -In order to gain a better understanding of the morphology and promoter edge content of the active phase of industrial HDT NiMoP catalysts in working conditions, a multi-technique study has been undertaken on a series of NiMoP catalysts with various Ni/Mo ratios. The combination of X-ray Photoelectron Spectroscopy (XPS), Transition Electron Microscopy (TEM), Density Functional Theory (DFT) modeling and catalytic testing (toluene hydrogenation) provided data to build a morphological model of NiMoS nanocrystallites. A parallel has been established with their CoMoS

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“…[56]. The binding energy of NiS for the two catalyst are around 875 eV, the peak emerging at 861 eV is attributed to NiO and the peak of NiMoS appears at 855 eV [57,58]. It should be mentioned that the modified catalyst shows a higher peak of NiMoS.…”

Section: Nh 3 -Tpd and Pyridine Ft-irmentioning

confidence: 99%

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

Wang

Xiao

Cheng

et al. 2015

Applied Catalysis A: General

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Aging of Co(Ni)MoP/Al2O3 catalysts in working state

Cited by 78 publications

References 17 publications

Competitive HDS and HDN reactions over NiMoS/HMS-Al catalysts: Diminishing of the inhibition of HDS reaction by support modification with P

Competitive HDS and HDN reactions over NiMoS/HMS-Al catalysts: Diminishing of the inhibition of HDS reaction by support modification with P

A Rational Comparison of the Optimal Promoter Edge Decoration of HDT NiMoS vs CoMoS Catalysts

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

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