Sulfur exchange capacity and thiophene hydrodesulfurization activity of sulfided molybdena-alumina catalysts promoted by nickel

Tétényi, P.; Ollár, Tamás; Szarvas, T.

doi:10.1016/j.cattod.2011.05.029

Cited by 10 publications

(9 citation statements)

References 35 publications

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“…3 However, organic nitrogen molecules found in petroleum are mostly aromatic heterocyclic compounds in a neutral form, such as pyrroles, or in a basic form, such as pyridines and quinolines. 8,9 Hydrodesulfurization (HDS) is the main desulfurization technology 10 and has been widely used to remove the majority of sulfur-containing compounds from fossil fuel. Moreover, the presence of these contaminants in fuels provokes corrosion of the refining equipment and combustion engines.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the presence of these contaminants in fuels provokes corrosion of the refining equipment and combustion engines. 9 Among the currently used processes for removing nitrogen compounds, the featured ones are the catalytic process of hydrodenitrogenation (HDN) and adsorption by activated carbon with a high specific surface area and porosity, which is capable of adsorbing 15 to 19 mg of nitrogen per gram of the adsorbent. 8,9 Hydrodesulfurization (HDS) is the main desulfurization technology 10 and has been widely used to remove the majority of sulfur-containing compounds from fossil fuel.…”

Section: Introductionmentioning

confidence: 99%

“…The ODS process has several advantages compared with the traditional HDS process, such as mild conditions (ambient pressure and relatively low temperatures) and high selectivity. Iron particles as catalysts play an important role in the reactions as they are very active in the CVD process to grow carbon filaments and are very active to promote H 2 O 2 decomposition in heterogeneous Fenton's reaction, [37][38][39] which makes them interesting to be used in the oxidation processes. [27][28][29] Oxidants such as hydrogen peroxide (H 2 O 2 ) and organic carboxylic acids are commonly used in the ODS process.…”

Section: Introductionmentioning

confidence: 99%

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Fe/C and FeMo/C hybrid materials for the biphasic oxidation of fuel contaminants

et al. 2017

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In the present work, hybrid magnetic nanoparticles based on Fe and FeMo coated with carbon nanostructures (Fe/C and FeMo/C) were produced by catalytic chemical vapor deposition at different temperatures using ethanol as the carbon source. Scanning electron microscopy, thermal analysis, Raman spectroscopy, X-ray diffraction, and Mössbauer spectroscopy analyses suggested that hematite was reduced by ethanol at 700 and 900 1C, producing carbon nanostructures such as nanofibers and nanotubes. The Fe/C and FeMo/C hybrid composites showed remarkable magnetic and amphiphilic properties. The composites were successfully used to oxidize sulfur and nitrogen contaminants present in fuels in a biphasic system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fe/C and FeMo/C hybrid materials for the biphasic oxidation of fuel contaminants

et al. 2017

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“…We provided a study of the selectivity in TH conversion on three catalysts of substantially different HDS activities observed in our former [27,28] studies of sulfided Mo-alumina and NiMo-alumina of 0.35 atomic Ni/Mo ratio (Mo and NiMo) and of the alumina supported nickel catalyst (Ni). In the investigation the conversion of a mixture of TH with THT has been studied, whereas the TH was labeled with radioactive carbon (thiophene-14 C).…”

Section: Introductionmentioning

confidence: 99%

Experimental proof of thiophene hydrodesulfurization reaction steps by isotope (14C) labeled thiophene

Tétényi

Szarvas

Ollár

2021

Reac Kinet Mech Cat

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Hydrodesulfurization of thiophene has been studied over alumina supported sulfided molybdena, nickel-promoted molybdena and over nickel (Mo, NiMo and Ni) catalysts. The experiments were carried out with a mixture of thiophene, labeled with radioactive carbon (thiophene-[G-]-14C) and of non-radioactive tetrahydrothiophene (1:1 mol ratio) in a micro catalytic system. It was established, that the main products were tetrahydrothiophene-14C, 1-butene-14C, 2-butene-14C, butane-14C. Tetrahydrothiophene-14C was a major intermediate in the conversion of thiophene—14C in the experimental condition applied. The amounts of converted tetrahydrothiophene on the catalysts were substantially higher than those of thiophene under the same conditions. Hydrothiophene and dihydrothiophene—14C were intermediate products in the hydrodesulfurization of thiophene and tetrahydrothiophene. The hydrodesulphurization of tetrahydrothiophene was paired with dehydrogenation, producing small amounts of thiophene. The experimental results have been considered in the discussion of the mechanism of thiophene and tetrahydrothiophene desulfurization reaction pathway.

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“…The removal of these compounds is a major operation in petroleum refining and is achieved by catalytic processes operated at high pressures and temperatures [26,27]. Therefore research has been developed for new material capable of lowering the conditions reactions to removal of sulfur compounds and nitrogen compounds [28].…”

Section: Introductionmentioning

confidence: 99%

Magnetic composites based on metallic nickel and molybdenum carbide: A potential material for pollutants removal

Mambrini

Fonseca

Dias

et al. 2012

Journal of Hazardous Materials

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New magnetic composites based on metallic nickel and molybdenum carbide, Ni/Mo(2)C, have been produced via catalytic chemical vapor deposition from ethanol. Scanning electron microscopy, thermal analysis, Raman spectroscopy and X-ray diffraction studies suggest that the CVD process occurs in a single step. This process involves the reduction of NiMo oxides at different temperatures (700, 800 and 900°C) with catalytic deposition of carbon from ethanol producing molybdenum carbide on Ni surface. In the absence of molybdenum the formation of Ni/C was observed. The magnetic molybdenum carbide was successfully used as pollutants removal by adsorption of sulfur and nitrogen compounds from liquid fuels and model dyes such as methylene blue and indigo carmine. The dibenzothiofene adsorption process over Ni/Mo(2)C reached approximately 20 mg g(-1), notably higher than other materials described in the literature and also removed almost all methylene blue dye. The great advantage of these carbide composites is that they may be easily recovered magnetically and reused.

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Sulfur exchange capacity and thiophene hydrodesulfurization activity of sulfided molybdena-alumina catalysts promoted by nickel

Cited by 10 publications

References 35 publications

Fe/C and FeMo/C hybrid materials for the biphasic oxidation of fuel contaminants

Fe/C and FeMo/C hybrid materials for the biphasic oxidation of fuel contaminants

Experimental proof of thiophene hydrodesulfurization reaction steps by isotope (14C) labeled thiophene

Magnetic composites based on metallic nickel and molybdenum carbide: A potential material for pollutants removal

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