Bimetallic Co–Mo complexes: A starting material for high active hydrodesulfurization catalysts

Климов, О. В.; Pashigreva, A. V.; Bukhtiyarova, G. A.; Будуква, С. В.; Fedotov, M. A.; Kochubey, D.I.; Chesalov, Yu. A.; Зайковский, В. И.; Носков, А. С.

doi:10.1016/j.cattod.2009.07.095

Cited by 35 publications

(28 citation statements)

References 39 publications

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“…To further understand the critical role of citric acid in the preparation of BM-HoMSs (taking the preparation of multishelled Fe 2 (MoO 4 ) 3 hollow spheres as an example), NMR was applied to characterize the chemical shift of 13 C before and after adding (NH 4 ) 2 MoO 4 (Figure a). The chemical shift of the characteristic peak and appearance of new peaks at 183.52 and 84.64 ppm proved the chelation happens between citric acid and MoO 4 2– . In additional to NMR, a mass spectrometer (MS) was used to characterize the relative molecular mass before and after adding (NH 4 ) 2 MoO 4 and FeCl 3 .…”

Section: Resultsmentioning

confidence: 99%

Construction of Multishelled Binary Metal Oxides via Coabsorption of Positive and Negative Ions as a Superior Cathode for Sodium-Ion Batteries

et al. 2018

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Multishelled binary metal oxide, which can exert a synergetic effect of different oxides, is a promising electrochemical electrode material. However, it is challenging to synthesize this kind of binary metal oxide due to the severe hydrolysis and/or precipitation reactions of the precursors between cations and anions of different metals. Herein, by using citric acid as a chelating agent to inhibit hydrolysis and precipitation, a series of multishelled binary metal oxide hollow spheres (Fe 2 (MoO 4 ) 3 , NiMoO 4 , MnMoO 4 , CoWO 4 , MnWO 4 , etc.) were obtained via coabsorption of negative and positive metal ions. In addition, the chelation between a metal ion and citric acid is systematically validated by NMR, MS, Raman, and UV−vis. In particular, multishelled Fe 2 (MoO 4 ) 3 hollow spheres show excellent electrochemical performance as cathode material for sodium-ion batteries benefited from their structural superiorities. Especially, the quintuple-shelled Fe 2 (MoO 4 ) 3 hollow sphere shows the highest specific capacity (99.03 mAh g −1 ) among all Fe 2 (MoO 4 ) 3 hollow spheres, excellent stability (85.6 mAh g −1 was retained after 100 cycles at a current density of 2.2 C), and outstanding rate capability (67.4 mAh g −1 can be obtained at a current density of 10 C). This general approach can be extended to the synthesis of other multishelled multielement metal oxides and greatly enrich the diversity of hollow multishelled structures.

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Section: Resultsmentioning

confidence: 99%

Construction of Multishelled Binary Metal Oxides via Coabsorption of Positive and Negative Ions as a Superior Cathode for Sodium-Ion Batteries

et al. 2018

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“…This explanation seems logical. How ever, in our case the chelating agent citric acid (CA) was used for preparing the combined impregnating solution of Mo, W, and Ni compounds as described in [15]. It is known that promoter is not bonded to the support when a chelating agent is present in the impregnating solution in the step of support impreg nation [16,17] and, as a consequence, the lateral dimensions of the crystallites (stacks) of MoS 2 increase [18].…”

Section: Resultsmentioning

confidence: 99%

Hydrogenolysis of dibenzothiophene on zinc-modified NiMoW/Al2O3 hydrotreating catalysts

et al. 2015

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The effect of the introduction of ZnO into the NiMoW/Al 2 O 3 hydrotreating catalyst on its activity in dibenzothiophene (DBT) hydrogenolysis has been studied. To select the optimal method for introducing the modifier, a series of samples has been prepared with ZnO added at different stages of the catalyst synthesis. Before the test, the catalysts were sulfided. The catalysts have been tested in the dibenzothiophene hydro genolysis reaction was under hydrogen pressure using a continuous flow microreactor. The interrelation of the active phase morphology, as well as the route of addition and amount of the added modifier with the cat alytic activity of the samples has been revealed. Modification of the support by adding ZnO in an amount of 0.5 wt % increases the activity of the catalyst in DBT hydrogenolysis.

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“…Catalysts prepared from bimetallic complexes based on citric acid display higher activity in the reac tion of hydrotreatment, compared to catalysts synthe sized from bimetallic complexes based on other organic complexing agents [6,32].…”

Section: Introductionmentioning

confidence: 97%

“…This method allows us to avoid chemical reactions between active metals and supports, thus ensuring higher activity [6]. However, the oxidative regeneration of these catalysts results in hard to sul fidize cobalt or nickel/molybdenum oxides that are chemically bonded to both each other and to the sup port.…”

Section: Introductionmentioning

confidence: 99%

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A new method for reactivating the supported deep hydrotreatment CoMo/Al2O3 and NiMo/Al2O3 catalysts after oxidative regeneration

2015

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A new method for the reactivation of CoMo/Al 2 O 3 and NiMo/Al 2 O 3 catalysts for the deep hydrotreatment of diesel fuel after the oxidative regeneration stage involves impregnating regenerated cata lysts with aqueous solutions of such chelating compounds as citric and oxalic acids, ethyleneglycol, and diethyleneglycol with subsequent drying. The activity of reactivated catalysts subjected to such treatment can be higher than for fresh samples. The effect of the nature and amount of introduced chelates on the activity of the IK GO 1 catalyst in the hydrotreatment of straight run diesel fuel is studied. Treating an oxidized sam ple with a solution containing both citric acid and glycol at the optimum molar ratio of total chelate com pounds to total metals (0.5-1.0) yields the best results. Regenerated catalysts thus enable the production of ultralow sulfur diesel fuels (10 ppm) at an initial hydrotreatment temperature 10-15°C lower than for cata lysts after their oxidative regeneration and 3-4°C lower than for fresh catalysts.

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Bimetallic Co–Mo complexes: A starting material for high active hydrodesulfurization catalysts

Cited by 35 publications

References 39 publications

Construction of Multishelled Binary Metal Oxides via Coabsorption of Positive and Negative Ions as a Superior Cathode for Sodium-Ion Batteries

Construction of Multishelled Binary Metal Oxides via Coabsorption of Positive and Negative Ions as a Superior Cathode for Sodium-Ion Batteries

Hydrogenolysis of dibenzothiophene on zinc-modified NiMoW/Al2O3 hydrotreating catalysts

A new method for reactivating the supported deep hydrotreatment CoMo/Al2O3 and NiMo/Al2O3 catalysts after oxidative regeneration

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