SBA-15 supports modified by Ti and Zr grafting for NiMo hydrodesulfurization catalysts

Gutiérrez, Oliver Y.; Fuentes, Gustavo A.; Salcedo, Cecilia; Klimova, Tatiana

doi:10.1016/j.cattod.2006.06.035

Cited by 130 publications

(117 citation statements)

References 55 publications

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“…The reduction of the intensity can be explained by the strong absorption of X-rays by Mo(Co) and/or a partial loss of the high order of the mesostructure. The same phenomenon was observed in previous studies [9,12,19].…”

Section: X-ray Diffractionsupporting

confidence: 91%

“…Further, SBA-15 can be easily modified with various hetero-atoms like Al, Ti and Zr. It was reported by Klimova et al, Rao et al and Fierro et al that modified SBA-15 supports exhibit stronger metal-support interactions with respect to pure SBA-15 yielding a high dispersion of the deposited Ni(Co) and Mo active species and consequently greater activity in the HDS [7][8][9][10]. In the majority of cases these catalysts were prepared via an oxide route, i.e., SBA-15 was impregnated with transition metal salts like ammonium heptamolybdate, nickel (cobalt) nitrate or nickel (cobalt) acetate and these materials were the calcined to produce stable oxides.…”

Section: Introductionmentioning

confidence: 98%

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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: X-ray Diffractionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 98%

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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“…Mesoporous SBA-15 was also found to be a suitable support for Mo, CoMo, and NiMo catalysts as reported by Rao and co-workers [10]. Furthermore, Al, Ti and Zr containing SBA-15 supported NiMo or CoMo catalysts were prepared by Klimova and co-workers [11,12], Rao and co-workers [13] and Fierro and co-workers [14]. They observed that SBA-15 modified with these hetero-atoms (Al, Ti, Zr) provides better dispersion for the deposited Ni (Co) and Mo active species and yields considerably high activity for HDS of DBT.…”

Section: Introductionmentioning

confidence: 94%

“…The mesoporous structure collapses immediately and releases many CoMoS 2 -nanoparticles onto the surface of the host as evidenced by EDX and SAED, see (Fig. 6b), which are obviously larger than the SBA-15 supported MoS 2 catalysts synthesized from the oxide precursors (length = 2-6 nm, average stacking = 3.5 [11].) The thermal decomposition of ATM on SBA-15 leads to a relatively poor MoS 2 dispersion which may be attributed to the weak interaction between the sulfides and the SBA-15 support with a low number of Si-OH groups and a low acidity.…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

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SBA-15 as Support for MoS2 and Co-MoS2 Catalysts Derived from Thiomolybdate Complexes in the Reaction of HDS of DBT

et al. 2007

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Molybdenum sulfide and cobalt-molybdenum sulfide catalysts supported on mesoporous SBA-15 were prepared by thermal decomposition of ammonium thiomolybdate (ATM). SBA-15 was synthesized at 353 K and 413 K to obtain pore diameters of about 6 and 9 nm, respectively. The (Co)-MoS 2 /SBA-15 catalysts were characterized with X-ray diffraction (XRD), N 2 -physisorption and high-resolution transmission electron microscopy (HRTEM). HRTEM images give evidence for the presence of a poorly dispersed MoS 2 phase with long MoS 2 slabs and a pronounced MoS 2 stacking. The catalytic performance in the hydrodesulfurization (HDS) reaction of dibenzothiophene (DBT) was examined at T = 623 K and P = 3.4 MPa. The Co-MoS 2 /SBA-15 materials show a relatively high catalytic activity with a strong preference for the direct desulfurization (DDS) pathway. This is an interesting result in view of the significant stacking of MoS 2 particles and the size of the slabs. The generation of the catalytically active CoMoS phase and a large number of coordinately unsaturated sites (CUS) may explain the high performance of Co promoted MoS 2 /SBA-15 catalysts in the HDS reaction.A confinement effect of the mesoporous channels of SBA-15 is observed for the unpromoted MoS 2 /SBA-15 catalysts. SBA-15 with 9 nm channel diameter with 11 wt.% Mo loading shows a higher selectivity for the hydrogenation pathway than SBA-15 with 6 nm channel and 16 wt.% Mo loading.

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Tuning Hydrodesulfurization Active‐Phase Dispersion using Optimized Mesoporous Titania‐Doped Silica Supports

et al. 2013

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International audienceSolids composed of TiO2 nano-crystallites (10-40wt%) dispersed in an SBA-15 matrix were synthesised and used as hydrodesulfurisation (HDS) active-phase supports. Well-dispersed polymolybdate species were detected by Raman spectroscopy on all the CoMo-based oxidic precursors. Undesirable bulk CoMoO4 mixed oxide was also detected on the surface of low-TiO2-content materials, which suggests the enhancement of the Mo oxidic species dispersion as a result of the presence of TiO2. After activation under H-2/H2S, the obtained catalysts were tested in the HDS of thiophene. An optimum conversion was observed for the catalyst supported on the solid that contained 20wt% TiO2, which outperformed the homologous samples supported on TiO2 and SBA-15. This clearly highlights the beneficial effect of using such nano-TiO2-SBA-15 composite supports, in which SBA-15 confers adequate textural properties to the system, and the active phase benefits from the dispersive effect of TiO2

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SBA-15 supports modified by Ti and Zr grafting for NiMo hydrodesulfurization catalysts

Cited by 130 publications

References 55 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

SBA-15 as Support for MoS2 and Co-MoS2 Catalysts Derived from Thiomolybdate Complexes in the Reaction of HDS of DBT

Tuning Hydrodesulfurization Active‐Phase Dispersion using Optimized Mesoporous Titania‐Doped Silica Supports

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