Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides

Jirátová, Květa; Spojakina, A.; Kaluža, Luděk; Palcheva, R.; Balabánová, Jana; Tyuliev, G.

doi:10.1016/s1872-2067(15)61016-6

Cited by 18 publications

(6 citation statements)

References 42 publications

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“…Furthermore, TPR profile of Mo/CeO 2 presents three peaks which could be attributed to the reduction of oxidic molybdenum at 763 o C and the reduction of CeO 2 , at 645 o C, and 833 o C, separately. The peak at 763 o C is corresponding to a partial reduction step of polymeric octahedral Mo species (Mo 6+ —Mo 4+ ) . The low‐temperature peak at 645 o C and high‐temperature peak at 780 o C is assigned to the removal of surface oxygen and the bulk oxygen of CeO 2 , respectively ,.…”

Section: Resultsmentioning

confidence: 99%

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

et al. 2018

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Nonsulfided CeO2‐supported different metal catalysts were synthesized, characterized and evaluated in the hydrogenation of octanoic acid with a batch reactor at the temperature of 280 oC and initial H2 pressure of 3 MPa. The effect of Mo species was revealed by comparing Mo‐doped catalysts with Mo‐free catalysts. The catalytic results show that the CeO2 supported Ni catalyst doped with Mo exhibit much higher catalytic activity and octane selectivity than the catalysts without dopants. Additionally, the influences of Mo and Ni mass ratio on the conversion of octanoic acid and the selectivity of heptane and octane over CeO2‐based catalysts were also discussed. Ni species seemed beneficial for the deoxygenation reaction to form C7 alkane, while the doping of Mo favored the hydrodeoxygenation path to C8 alkane via dehydration‐hydrogenation of the octanol intermediate.

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Section: Resultsmentioning

confidence: 99%

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

et al. 2018

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“…Even in methods that are developed to synthesize composite supports such as mechanochemical route for preparation of CeO 2 −Al 2 O 3 support, 46 NH 4 HCO 3 was used as an additive. It could be concluded that structure-directing agents are commonly used in synthesis of mesoporous γ-alumina, whereas aluminum nitrate or alkoxides were used as precursors.…”

Section: ■ Introductionmentioning

confidence: 99%

Ultradeep Hydrodesulfurization of Feedstock Containing Cracked Gasoil through NiMo/γ-Al₂O₃ Catalyst Pore Size Optimization

Asadi

Alavi

Royaee³

et al. 2018

Energy Fuels

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The importance of ultradeep hydrodesulfurization (HDS) of the cracked and straight run gasoil blend necessitate an extensive study on HDS catalyst optimization. Herein, we report a CO2 assisted neutralization of NaAlO2 aqueous solution conducted in a semibatch membrane dispersion microstructured reactor, as a novel method to synthesize pseudoboehmite powders with different textural properties. A number of γ-Al2O3 catalyst supports as well as NiMo catalysts with the average pore sizes of 6.3 (5.2) to 21.5 (18.6) nm and 5.0 (3.7) to 20.3 (17.2) nm are prepared using the as synthesized pseudoboehmite powders. XRD analysis shows the sizes of all pseudoboehmite and γ-Al2O3 supports crystalline are in the nanoscale range. NH3 TPD results reveal that about half of the total NH3 (1.76 mmol NH3/g) is adsorbed on the surface of γ-Al2O3 support due to presence of strong acidic cites. FTIR spectrometer confirms formation of MoO4 –2 species. The effects of catalyst pore size on HDS performance of the straight run gasoil and its blend with cracked gasoil are also investigated according which, the most sulfur removal from both feedstocks using catalysts with the average pore size of 8.0 (5.9) and 9.1 (7.2) nm, respectively, emphasizing the significant role of the pore size on the catalyst activity and HDS process efficiency. However, effects of textural and physicochemical properties of the catalyst and its support cannot be neglected. The obtained results confirm the proposed synthesis route would be an efficient alternative method to prepare mesoporous γ-Al2O3 supports with precisely controlled average pore size in a wide range of a few up to 20 nm.

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“…Despite the successful use of CeO 2 to catalyze hydrogenation reactions [ 37 , 38 , 39 , 40 , 41 ], the use of Al 2 O 3 -CeO 2 oxides to support HDS catalysts has received very little attention [ 6 , 7 , 42 , 43 , 44 ]. For example, the impregnation of alumina with ceria precursors has been reported to improve the HDS activity of supported MoS 2 [ 42 ] and metallic Pd catalysts [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the impregnation of alumina with ceria precursors has been reported to improve the HDS activity of supported MoS 2 [ 42 ] and metallic Pd catalysts [ 44 ]. Similarly, NiMo sulfide catalysts supported on Al 2 O 3 -CeO 2 mixed oxides prepared by mechano-physical mixing demonstrated higher HDS activity than that of a reference NiMo/Al 2 O 3 catalyst [ 43 ]. Although the sol-gel method has been shown to be the best method to obtain mixed oxides with respect to materials prepared with impregnation [ 4 , 5 , 45 , 46 ], there are no reports on the use of one-pot synthesis for the preparation of HDS catalysts supported on Al 2 O 3 -CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization of Dibenzothiophene over Ni-Mo-W Sulfide Catalysts Supported on Sol-Gel Al2O3-CeO2

et al. 2022

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To achieve sulfur content in gas oil at a near-zero level, new catalysts with improved hydrogenation functions are needed. In this work, new Ni-Mo-Mo hydrodesulfurization (HDS) catalysts supported by Al2O3-CeO2 materials were synthesized to evaluate their efficiency in the reaction of HDS with dibenzothiophene (DBT). Al2O3-CeO2 supports different CeO2 loadings (0, 5, 10 and 15 wt.%) and supported NiMoW catalysts were synthesized by sol-gel and impregnation methods, respectively. The physicochemical properties of the supports and catalysts were determined by a variety of techniques (chemical analysis, XRD, N2 physisorption, DRS UV-Vis, XPS, and HRTEM). In the DBT HDS reaction carried out in a batch reactor at 320 °C and a H2 pressure of 5.5 MPa, the sulfide catalysts showed a dramatic increase in activity with increasing CeO2 content in the support. Nearly complete DBT conversion (97%) and enhanced hydrogenation function (HYD) were achieved on the catalyst with the highest CeO2 loading. The improved DBT conversion and selectivity towards the hydrogenation products (HYD/DDS ratio = 1.6) of this catalyst were attributed to the combination of the following causes: (i) the positive effect of CeO2 in forcing the formation of the onion-shaped Mo(W)S2 layers with a large number of active phases, (ii) the inhibition of the formation of the undesired NiAlO4 spinel phase, (iii) the appropriate textural properties, (iv) the additional ability for heterolytic dissociation of H2 on the CeO2 surfaces, and (v) the increase in Brønsted acidity.

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Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides

Cited by 18 publications

References 42 publications

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

Ultradeep Hydrodesulfurization of Feedstock Containing Cracked Gasoil through NiMo/γ-Al₂O₃ Catalyst Pore Size Optimization

Hydrodesulfurization of Dibenzothiophene over Ni-Mo-W Sulfide Catalysts Supported on Sol-Gel Al2O3-CeO2

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Hydrodesulfurization activities of NiMo catalysts supported on mechanochemically prepared Al-Ce mixed oxides

Cited by 18 publications

References 42 publications

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO2‐Supported Bimetal Catalysts: The Role of Mo

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO2‐Supported Bimetal Catalysts: The Role of Mo

Ultradeep Hydrodesulfurization of Feedstock Containing Cracked Gasoil through NiMo/γ-Al2O3 Catalyst Pore Size Optimization

Hydrodesulfurization of Dibenzothiophene over Ni-Mo-W Sulfide Catalysts Supported on Sol-Gel Al2O3-CeO2

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Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO₂‐Supported Bimetal Catalysts: The Role of Mo

Ultradeep Hydrodesulfurization of Feedstock Containing Cracked Gasoil through NiMo/γ-Al₂O₃ Catalyst Pore Size Optimization