A new approach in the evaluation of the support effect for NiMo hydrodesulfurization catalysts

• Published in: Applied catalysis. A, General Vol. 407; no. 1; pp. 29 - 39
• Main Authors: Ninh, T.K.T., Massin, L., Laurenti, D., Vrinat, M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 04-11-2011; Elsevier
• Subjects: Catalysis; Catalysts; Catalytic activity; Chemical Sciences; Chemistry; Environment and Society; Environmental Sciences; Exact sciences and technology; General and physical chemistry; Hydrodesulfurization; Molybdenum sulfides; Ni(acac) 2; NiMo supported catalysts; Preparation; Silicon dioxide; Support effect; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium dioxide; X-ray photoelectron spectroscopy; XPS; Zirconium dioxide; NiMo supported catalysts; Support effect; XPS; Ni(acac) 2; Preparation; Hydrodesulfurization; Binary compound; Five membered ring; High resolution; Support; Molybdenum sulfide; Ni(acac); X ray; Thiophene; Silica; Supported catalyst; Geometrical model; Characterization; Photoelectron spectrometry; Aluminium oxide; Catalytic reaction; Transition element compounds; Transition metal; Heterogeneous catalysis; Sulfur heterocycle; Transmission electron microscopy; Silicon oxides; Nickel; Titanium oxide; Alumina
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2011.08.019

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► Comparison of MoS
2 and NiMoS catalysts onto alumina, silice, titania and zirconia. ► Ni-promotion of MoS
2-supported catalysts by using Ni(acac)
2. ► XPS quantification of NiMoS phase onto different supports. ► Intrinsic catalytic HDS activities of NiMoS active sites.
To evaluate the intrinsic effect of some supports (γ-Al
2O
3, SiO
2, TiO
2, ZrO
2) on the activity of hydrodesulfurization (HDS) catalysts, NiMo catalysts were prepared by adding nickel acetylacetonate (Ni(acac)
2) to supported molybdenum sulfide. The catalysts were characterized by X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy and then tested in HDS of thiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT). This preparation method allowed obtaining well-promoted catalysts. A higher percentage (69–80%) of NiMoS phase was observed by XPS for these catalysts than for traditional co-impregnated catalysts (60%). In addition, the catalytic activity measured with those promoted systems was improved especially for TiO
2 and ZrO
2 supported NiMoS catalysts. By combining characterizations, geometrical model and catalytic activities, apparent HDS activities per NiMoS site were evaluated on each support. The high quality of NiMoS sites suggests that Type-II sites have been formed on silica.