Impact of Ni promotion on the hydrogenation pathways of phenanthrene on MoS2/γ-Al2O3

Schachtl, Eva; Yoo, Jong Suk; Gutiérrez, Oliver Y.; Studt, Felix; Lercher, Johannes A.

doi:10.1016/j.jcat.2017.05.003

Cited by 45 publications

(42 citation statements)

References 52 publications

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“…Ni promotion is generally observed to provide better hydrogenation activity than Co promotion, particularly in the conversion of aromatic species [36][37][38][39][40][41] as known from both HDO and hydrodesulfurization (HDS). In this case, however, a rather similar activity was obtained with Ni and Co promotion; especially at higher active phase loadings.…”

Section: Influence Of Active Phase Loading and Choice Of Promotermentioning

confidence: 99%

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS2/MgAl2O4 Catalysts

et al. 2019

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The hydrodeoxygenation (HDO) of ethylene glycol over MgAl2O4 supported NiMo and CoMo catalysts with around 0.8 and 3 wt% Mo loading was studied in a continuous flow reactor setup operated at 27 bar H2 and 400 °C. A cofeed of H2S of typically 550 ppm was beneficial for both deoxygenation and hydrogenation and for enhancing catalyst stability. With 2.8-3.3 wt% Mo, a total carbon based gas yield of 80-100 % was obtained with an ethane yield of 36-50 % at up to 118 h on stream. No ethylene was detected. A moderate selectivity towards HDO was obtained, but cracking and HDO were generally catalyzed to the same extent by the active phase. Thus, the C2/C1 ratio of gaseous products was 1.1-1.5 for all prepared catalysts independent on Mo loading (0.8-3.3 wt%), but higher yields of C1-C3 gas products were obtained with higher loading catalysts. Similar activities were obtained from Ni and Co promoted catalysts. For the low loading catalysts (0.83-0.88 wt% Mo), a slightly higher hydrogenation activity was observed over NiMo compared to CoMo, giving a relatively higher yield of ethane compared to ethylene. Addition of 30 wt% water to the ethylene glycol feed did not result in significant deactivation. Instead, the main source of deactivation was carbon deposition, which was favored at limited hydrogenation activity and thus, was more severe for the low loading catalysts.

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Section: Influence Of Active Phase Loading and Choice Of Promotermentioning

confidence: 99%

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS2/MgAl2O4 Catalysts

et al. 2019

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“…This approach allowed identifying two subsets of surface SH groups, with each subset showing a characteristic activity and regioselectivity toward the hydrogenation of phenanthrene (PHE). PHE is a C 14 polycyclic aromatic hydrocarbon representative of those present in heavy oil fractions, the reaction pathway and mechanism of which has been extensively studied …”

Section: Mass Specific Rates (Extrapolated To Zero Contact Time) Of Pmentioning

confidence: 99%

“…Only four products were detected with all studied sulfide catalysts at low to moderate conversions of PHE (1–25 %), that is, 9,10‐dihydrophenanthrene (DiHPHE), 1,2,3,4‐tetrahydrophenanthrene (TetHPHE), 1,2,3,4,5,6,7,8‐octahydrophenanthrene (symOHPHE), and 1,2,3,4,4a,9,10,10a‐octahydrophenanthrene (asymOHPHE). The latter two are nearly absent on WS 2 /γ‐Al 2 O 3 (Figure S1) and MoS 2 /γ‐Al 2 O 3 . The reaction network is composed of two parallel routes, that is, initial hydrogenation at the middle ring (PHE→DiHPHE→asymOHPHE) and initial hydrogenation at a lateral ring (PHE→TetHPHE→symOHPHE).…”

Section: Mass Specific Rates (Extrapolated To Zero Contact Time) Of Pmentioning

confidence: 99%

“…The reaction network is composed of two parallel routes, that is, initial hydrogenation at the middle ring (PHE→DiHPHE→asymOHPHE) and initial hydrogenation at a lateral ring (PHE→TetHPHE→symOHPHE). The dehydrogenation of DiHPHE to PHE and its hydrogenation to TetHPHE were demonstrated for the same reaction catalyzed by (Ni)MoS 2 /γ‐Al 2 O 3 . At low conversions, both DiHPHE reactions can be neglected …”

Section: Mass Specific Rates (Extrapolated To Zero Contact Time) Of Pmentioning

confidence: 99%

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Active Sites on Nickel‐Promoted Transition‐Metal Sulfides That Catalyze Hydrogenation of Aromatic Compounds

et al. 2018

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Hydrogenation on Mo and Wsulfides occurs at the edges of the sulfide slabs.T he rate of hydrogen addition is directly proportional to the concentration of sulfhydryl (SH) groups at the slab edge and the metal atom attached to it. Sulfhydryl groups vicinal to edge-incorporated Ni hydrogenate with muchh igher rates than SH close to Mo and W. Each subset of SH groups,however,exhibits nearly identical intrinsic activity and selectivity,independent of the sulfide composition. The higher activity of Ni-WS 2 compared to Ni-MoS 2 stems from ah igher concentration of SH groups on the former sulfide associated with ah igher tendency of its surface vacancies to react with H 2 .

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“…For phenolic species, it is commonly accepted that Co promotes DDO routes while Ni promotes HYD routes [182,216,217,219,220,246,249,250]. In line with this observation, Co-MoS2/Al2O3 seems to have a higher activity for HDO of aromatic species compared to Ni-MoS2/Al2O3, while the opposite is the case for aliphatic species [216,217,243,246].…”

Section: Role Of Promotionmentioning

confidence: 71%

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

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et al. 2018

Progress in Energy and Combustion Science

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147

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Impact of Ni promotion on the hydrogenation pathways of phenanthrene on MoS2/γ-Al2O3

Cited by 45 publications

References 52 publications

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS2/MgAl2O4 Catalysts

The Influence of Active Phase Loading on the Hydrodeoxygenation (HDO) of Ethylene Glycol over Promoted MoS2/MgAl2O4 Catalysts

Active Sites on Nickel‐Promoted Transition‐Metal Sulfides That Catalyze Hydrogenation of Aromatic Compounds

Transportation fuels from biomass fast pyrolysis, catalytic hydrodeoxygenation, and catalytic fast hydropyrolysis

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