Hydrodesulfurization Activity of MoS<sub>2</sub> and Bimetallic Catalysts Prepared by in Situ Decomposition of Thiosalt

Trakarnpruk, Wimonrat; Seentrakoon, Boonchai

doi:10.1021/ie061176y

Cited by 32 publications

(11 citation statements)

References 25 publications

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“…The DDS/HYD ratios of MoS 2 catalysts, with or without any support, generally fall in the range of 0.12–2 . The DDS/HYD ratio for MoS 2 prepared by the in situ decomposition of thiosalt was 2 . The agglomeration of Mo crystals promotes the HYD reaction route .…”

Section: Resultsmentioning

confidence: 99%

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Sharifvaghefi

Zheng

2015

ChemCatChem

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Superparamagnetic MoS2/SiO2/Fe3O4 catalysts that consist of magnetite as the core, silica as the covering layer, and molybdenum sulfide as the top layer were prepared in easy steps. Two different surfactants (anionic and cationic) were used to assist with the synthesis of two of the samples, and one sample was prepared without surfactant. The surfactant was found to have a significant effect on the properties and activity of the final catalysts. Hydrodesulfurization (HDS) tests of the catalysts show higher activity for the cationic‐surfactant‐assisted catalyst. Between the direct desulfurization (DDS) and hydrogenation pathways for the prepared catalysts, the DDS pathway was found to be dominant for the HDS of dibenzothiophene. As a result of the magnetic properties of this catalyst, it can be separated easily from the reaction media by a magnetic field applied externally and reused, which makes it an ideal choice for slurry reactors that process heavy and extra‐heavy crude oil.

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Section: Resultsmentioning

confidence: 99%

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Sharifvaghefi

Zheng

2015

ChemCatChem

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“…A beneficial effect on the final HDS activity of carbon-containing tetraalkylammonium precursors was indeed clearly observed for CoMo catalysts prepared using the in situ method of activation [14,15,33]. Co/C 4 -MoS 2in situ catalyst was twice more active than Co/MoS 2in situ (17.3 9 10 -7 mol g -1 s -1 vs. 9.4 9 10 -7 mol g -1 s -1 ).…”

Section: Discussionmentioning

confidence: 99%

Unsupported NiMo Sulfide Catalysts Obtained from Nickel/Ammonium and Nickel/Tetraalkylammonium Thiomolybdates: Synthesis and Application in the Hydrodesulfurization of Dibenzothiophene

2008

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Ammonium and tetraalkylammonium tetrathiomolybdates impregnated with nickel nitrate were used as precursors of unsupported NiMo sulfide catalysts. The precursors were decomposed either in situ during the course of a dibenzothiophene (DBT) hydrodesulfurization (HDS) test or ex situ through sulfidation by H 2 S/H 2 (15% v/v H 2 S). The catalysts were characterized by thermogravimetric analysis, N 2 adsorption, scanning electron microscopy (SEM), and X-ray diffraction. Textural and catalytic properties of these NiMo catalysts were strongly influenced both by the nature of the precursor and the activation procedure. For ex-situ activated NiMo catalysts, the use of carbon-containing tetraalkylammonium thiosalts as precursors did not lead to a significant improvement in HDS activity. For in situ activated NiMo catalysts, the role of carbon is more complex. The use of tetramethyl-or tetrapropylammonium tetrathiomolybdate salts led to a poor final HDS activity while using tetrabutylammonium tetrathiomolybdate, a net increase in HDS activity was observed compared to the use of the non-carbon containing ammonium tetrathiomolybdate. This was related to the development of a mesoporous structure and to a high increase in surface area. This result is in agreement with those found previously for CoMo catalysts and confirms that tetraalkylammonium tetrathiomolybdate salts with long alkyl chains lead to Co-or Ni-promoted MoS 2 -based catalysts with enhanced HDS activity if in situ activated.

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“…High amounts of carbon (3.80 B C/Mo B 6.50) are found in all the MoS 2 catalysts. The prime source of this carbon is most probably the decalin solvent [29], especially in the case of the catalyst prepared from ATTM, since it contains no carbon; the greater carbon content of the MS-C14 and MS-C16 catalysts is thought to derive from the availability of the precursor's alkyl chains [15]. Table 2 lists the specific surface areas and total pore volumes for MoS 2 catalysts produced by in situ decomposition of the precursor series.…”

Section: Elemental Analysismentioning

confidence: 99%

HDS of DBT with Molybdenum Disulfide Catalysts Prepared by In Situ Decomposition of Alkyltrimethylammonium Thiomolybdates

et al. 2011

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Three alkyltrimethylammonium thiomolybdates, [R-N(CH 3 ) 3 ] 2 MoS 4 (where R = lauryl, myristyl or cetyl) were synthesized in aqueous solution, and characterized by 1 H-NMR spectroscopy. These alkyltrimethylammonium thiomolybdates were used (the lauryl and myristyl thiomolybdates for the first time) as precursors for in situ prepared MoS 2 catalysts, activated during the hydrodesulfurization of dibenzothiophene. The catalysts were analyzed by EDX, showing large voids and a S/Mo ratio around 2. High surface areas up to 443 m 2 /g and type IV adsorptiondesorption nitrogen isotherms were obtained. X-ray diffraction showed that the catalysts are poorly crystalline, with a very weak (002) peak intensity for all samples except the MoS 2 catalyst prepared from pure ammonium tetrathiomolybdate precursor. A high dibenzothiophene conversion (74%) was observed with the catalyst obtained from the lauryltrimethylammonium thiomolybdate precursor, attributed mainly to its high specific surface area. Selectivity results showed that all the prepared catalysts strongly favored the hydrogenation pathway.

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Hydrodesulfurization Activity of MoS₂ and Bimetallic Catalysts Prepared by in Situ Decomposition of Thiosalt

Cited by 32 publications

References 25 publications

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Unsupported NiMo Sulfide Catalysts Obtained from Nickel/Ammonium and Nickel/Tetraalkylammonium Thiomolybdates: Synthesis and Application in the Hydrodesulfurization of Dibenzothiophene

HDS of DBT with Molybdenum Disulfide Catalysts Prepared by In Situ Decomposition of Alkyltrimethylammonium Thiomolybdates

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Hydrodesulfurization Activity of MoS2 and Bimetallic Catalysts Prepared by in Situ Decomposition of Thiosalt

Cited by 32 publications

References 25 publications

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Development of a Magnetically Recyclable Molybdenum Disulfide Catalyst for Direct Hydrodesulfurization

Unsupported NiMo Sulfide Catalysts Obtained from Nickel/Ammonium and Nickel/Tetraalkylammonium Thiomolybdates: Synthesis and Application in the Hydrodesulfurization of Dibenzothiophene

HDS of DBT with Molybdenum Disulfide Catalysts Prepared by In Situ Decomposition of Alkyltrimethylammonium Thiomolybdates

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Hydrodesulfurization Activity of MoS₂ and Bimetallic Catalysts Prepared by in Situ Decomposition of Thiosalt