Hydrodesulfurization Activity of CoMo Catalysts Supported on Stabilized TiO<sub>2</sub>

Schacht, P.; Hernández, Gonzalo; Cedeño, Luis; Mendoza, J. H.; Ramírez, Sergio; García, Alfredo; Ancheyta, Jorge

doi:10.1021/ef020144u

Cited by 41 publications

(15 citation statements)

References 16 publications

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“…Similar results have been observed for Ni/γalumina and Ni/Alfollowing the addition of lanthanum, the catalytic efficiency and selectivity resulted in significant improvements in toluene reforming and syngas conversions [23][24][25]. [26].…”

Section: Introductionsupporting

confidence: 78%

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Valdés

González

Flores

et al. 2021

Applied Catalysis A: General

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Highlights:  A triphasic La-Co-Mo sulfide HDS catalyst was successfully synthesized using solvothermal synthesis  LaCoMoS2 showed enhanced activity over CoMoS2 catalysts.  The LaCoMoS2 activity as improved with increasing La doping  LaCoMoS2 showed less carbon than CoMoS2 after once catalytic cycle.  The La doping of the CMoS2 catalyst led to improvement in the direct desulfurization pathway.

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Section: Introductionsupporting

confidence: 78%

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Valdés

González

Flores

et al. 2021

Applied Catalysis A: General

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“…

13090 drodesulfurization catalysts, [8][9][10][11] which have been characterized by various techniques. However, in most cases the samples studied were prepared using by conventional incipient wetness or wet impregnation, whereas characterization concerns the surface species which are formed after drying and mostly after calcination.

…”

mentioning

confidence: 99%

Interfacial Impregnation Chemistry in the Synthesis of Cobalt Catalysts Supported on Titania

Petsi

Panagiotou

Garoufalis

et al. 2009

Chemistry A European J

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The interfacial chemistry of the impregnation step involved in the synthesis of cobalt catalysts supported on titania was investigated with regard to the mode of interfacial deposition of the aqua complex [Co(H(2)O)(6)](2+) on the "titania/electrolyte solution" interface, the structure of the inner-sphere complexes formed, and their relative interfacial concentrations. Several methodologies based on the application of deposition experiments and electrochemical techniques were used in conjunction with diffuse-reflectance spectroscopy and EPR spectroscopy. These suggested the formation of mononuclear/oligonuclear inner-sphere complexes on deposition of the [Co(H(2)O)(6)](2+) ions at the "titania/electrolyte solution" interface. The joint application of semiempirical quantum-mechanical calculations, stereochemical considerations, and modeling of the deposition data revealed the exact structure of these complexes and allowed their relative concentrations at various Co(II) surface concentrations to be determined. It was found that the interface speciation depends on the Co(II) surface concentration. Mononuclear complexes are formed at the compact layer of the "titania/electrolyte solution" interface for low and medium Co(II) surface concentrations. Formation of mono-hydrolyzed Ti(2)O-TiO and the dihydrolyzed TiO-TiO disubstituted configurations is very probable. In the first configuration one water ligand of the [Co(H(2)O)(6)](2+) ion is substituted by a bridging surface oxygen atom and another by a terminal surface oxygen atom. In the second configuration two water ligands of the [Co(H(2)O)(6)](2+) ion are substituted by two terminal surface oxygen atoms. Binuclear and trinuclear inner-sphere complexes are formed, in addition to the mononuclear ones, at relatively high Co(II) surface concentrations.

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“…The molar ratios of acid/alcoxide, solvent/alcoxide, and water/alcoxide were 0.2, 0.75, and 10, respectively. The peptization of the resulting hydrolyzate with nitric acid was then left during 60 hr at room temperature and then was dried and calcined as mentioned above (Schacht et al, 2003).…”

Section: Preparation Of the Supportsmentioning

confidence: 99%

The Support Effect on Hydrogenolysis of Thiophene and Gas–Oil

Hanafi

Elmelawy

Sultan

2011

Petroleum Science and Technology

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Results are reported on the support effect on the catalytic activity in thiophene hydrodesulfurization (HDS) of sulfided Ni-Mo catalysts supported on pure niobia, mixed oxides of Nb 2 O 5 -TiO 2 prepared by sol-gel method, and Nb 2 O 5 /TiO 2 and Nb 2 O 5 /Al 2 O 3 prepared by surface deposition. The prepared samples were characterized using N 2 adsorption at 196 ı C, X-ray diffraction (XRD), and temperatureprogrammed reduction (TPR) techniques. This study showed activity variation as a function of support composition. The activity of niobia-rich catalysts was no longer promoted by the synergy between Ni and Mo. The absence of synergy between molybdenum and nickel on niobia can be explained by the strong interaction of each metal with niobia at the expense of interaction with each other. It was found that 5 wt% Nb 2 O 5 /TiO 2 -supported catalyst was the better catalyst for thiophene HDS. It was shown that by means of an adequate support design it is possible to significantly increase the functionalities of HDS catalysts. Semiconducting supports like TiO 2 can improve the HDS activity by exerting electronic effects on the active phase, helping in this way the formation of sulfur vacancies. The 5 wt% Nb 2 O 5 /TiO 2 was also tested at high pressure with gas oil feedstock. It is observed with the hydrogeolysis of sulfur compounds against time-on-stream that the activity of this catalyst decreases fast with time.

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Hydrodesulfurization Activity of CoMo Catalysts Supported on Stabilized TiO₂

Cited by 41 publications

References 16 publications

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Interfacial Impregnation Chemistry in the Synthesis of Cobalt Catalysts Supported on Titania

The Support Effect on Hydrogenolysis of Thiophene and Gas–Oil

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Hydrodesulfurization Activity of CoMo Catalysts Supported on Stabilized TiO2

Cited by 41 publications

References 16 publications

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Effect of Lanthanum Doping on the reactivity of unsupported CoMoS2 catalysts

Interfacial Impregnation Chemistry in the Synthesis of Cobalt Catalysts Supported on Titania

The Support Effect on Hydrogenolysis of Thiophene and Gas–Oil

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Hydrodesulfurization Activity of CoMo Catalysts Supported on Stabilized TiO₂