Present State of the Art and Future Challenges in the Hydrodesulfurization of Polyaromatic Sulfur Compounds

Whitehurst, D.D.; Isoda, Takaaki; Mochida, Isao

doi:10.1016/s0360-0564(08)60631-8

Cited by 547 publications

(416 citation statements)

References 101 publications

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“…The HDS of DBT occurs by two parallel reaction pathways [18]: (I) direct desulfurization (DDS) via C-S bond cleavage and (II) hydrogenation (HYD). The obtained main products are biphenyl (BP, via DDS), cyclohexylbenzene (CHB, via HYD) and tetrahydrodibenzothiophene (TH-DBT, via HYD).…”

Section: Sample Characterizationmentioning

confidence: 99%

Preparation and Characterization of SBA-15 Supported Cobalt–Molybdenum Sulfide Catalysts for HDS Reaction: An All Sulfide Route to Hydrodesulfurization Catalysts

et al. 2008

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MoS 2 hydrodesulfurization (HDS) catalysts promoted with Co supported on SBA-15 were synthesized from sulfur-containing Mo sources [ammonium thiomolybdate (ATM), and tetramethylammonium thiomolybdate (TMATM)] and Co complexes cobalt dimethylthiocarbamate by using different synthesis strategies in order to achieve active catalysts. The (Co)-MoS 2 /SBA-15 catalysts were characterized with X-ray diffraction, N 2 -physisorption and High-Resolution Transmission Electron Microscopy. The catalytic performance in the HDS reaction of dibenzothiophene was examined at T = 623 K and P H2 = 3.4 MPa. The results of the experiments suggest that the sequence of impregnation steps has no significant influence on the HDS activity. On the other hand, the use of different thiomolybdate precursors significantly affects the catalytic activity. The catalysts derived from TMATM show lower HDS activities compared to the catalysts synthesized from ATM which is probably due to the presence of pronounced pore blocking as well as the generation of big needle-like aggregates of the Co-MoS 2 phase. It seems that the formation of intermediate MoS 3 is not a prerequisite for the generation of catalytic active CoMoS phases. The high activity and high selectivity for the direct desulfurization pathway of catalysts prepared with ATM despite the large MoS 2 stacking could be due to the generation of a large number of coordinately unsaturated sites.

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Section: Sample Characterizationmentioning

confidence: 99%

Preparation and Characterization of SBA-15 Supported Cobalt–Molybdenum Sulfide Catalysts for HDS Reaction: An All Sulfide Route to Hydrodesulfurization Catalysts

et al. 2008

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“…The stacking of the MoS2 slabs may be indicative of the formation of the higher activity Type II sites of the Co _ Mo _ S phase 6) . These layers of MoS2, which are formed on the support, not only increase the contact efficiency of the reactants but also contain active sites, e.g., the Co _ Mo _ S phase 7), 8) . On the other hand, the number of such laminating layers on the conventional catalyst averages less than two, so this catalyst has a larger proportion of the lower activity Type I sites of the Co _ Mo _ S phase.…”

Section: Nature Of the Active Site 1 1 Tem Measurementsmentioning

confidence: 99%

Development of Highly Active Co-Mo Catalysts with Phosphorus and Citric Acid for Ultra-deep Desulfurization of Diesel Fractions (Part 2) Characterization of Active Sites

Fujikawa

Kato

Ebihara

et al. 2005

J. Jpn. Petrol. Inst.

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Mo K-edge EXAFS, TEM and FT-IR of adsorbed NO were performed to further investigate the nature of the active sites on the CoMo/HY-Al2O3 catalyst containing citric acid and phosphorus, which had significantly higher HDS activity compared to the conventional CoMoP/Al2O3 catalyst. The results showed that the new catalyst has multiple layers of MoS2 slabs and the edges of MoS2 are mainly occupied by Co _ Mo _ S phases. XPS and FT-IR were used to investigate the sulfiding behavior of Co and Mo in the formation process of the active sites during sulfidation. The results showed that addition of citric acid to the impregnation solution postponed the sulfidation of Co at low temperatures, thereby increasing formation of the Co _ Mo _ S phase.

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“…Though traditional HDS catalysts are highly efficient in removing thiols, sulfides, and disulfides, they are inefficient in ultra-deep desulfurization of refractory sulfur-containing compounds, such as 4,6-dimethydibenzothiophene (4,6-DMDBT). Therefore, development of novel HDS catalysts with super high activity is needed [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

Wang

Zhang

et al. 2011

Applied Catalysis A: General

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Present State of the Art and Future Challenges in the Hydrodesulfurization of Polyaromatic Sulfur Compounds

Cited by 547 publications

References 101 publications

Preparation and Characterization of SBA-15 Supported Cobalt–Molybdenum Sulfide Catalysts for HDS Reaction: An All Sulfide Route to Hydrodesulfurization Catalysts

Preparation and Characterization of SBA-15 Supported Cobalt–Molybdenum Sulfide Catalysts for HDS Reaction: An All Sulfide Route to Hydrodesulfurization Catalysts

Development of Highly Active Co-Mo Catalysts with Phosphorus and Citric Acid for Ultra-deep Desulfurization of Diesel Fractions (Part 2) Characterization of Active Sites

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

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