Support effect in hydrotreating catalysts: hydrogenation properties of molybdenum sulfide supported on β-zeolites of various acidities

Hédoire, Claude-Emmanuel; Louis, Catherine; Davidson, Anne; Breysse, M.; Maugé, Françoise; Vrinat, M.

doi:10.1016/s0021-9517(03)00308-7

Cited by 77 publications

(57 citation statements)

References 14 publications

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“…This could be an explanation for the decrease of the Mo activity when deposited on Nb-containing support. On the other hand, the decrease of the HYD activity appears in contradiction with the results reported by He´doire et al [16]. Indeed, these authors reported that the activity in tetralin hydrogenation of Mo sulfide was slightly enhanced by the support acidity (b-zeolites) and linked with the high-frequency shift of the m(CO) mode of CO adsorbed on Mo supported on the more acidic support.…”

Section: Discussioncontrasting

confidence: 69%

“…This wavenumber change points out a modification of the electronic properties of the sulfided phase. Previous studies on sulfided phases (M = Mo or Ru) deposited on zeolites [15,16] and on amorphous silica alumina [17], reported an upward shift of the CO/M band when the acidity of the support increased. Since hydroxyl groups of the niobium-containing support are more acidic than on alumina (Mo/NbAl: m(CO/OH) = 2158 cm )1 -Mo/Al: m(CO/OH) = 2155 cm )1 ), the present spectroscopic results confirm the trend.…”

Section: Ftir Spectroscopy Of Adsorbed Comentioning

confidence: 99%

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Effect of the electronic properties of Mo sulfide phase on the hydrotreating activity of catalysts supported on Al2O3, Nb2O5 and Nb2O5/Al2O3

Rocha¹,

Faro²,

Oliviero

et al. 2006

Catal Lett

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Activity in thiophene hydrodesulfurization (HDS) and in the three routes of 2,6-dimethylaniline (DMA) decomposition was examined on Mo sulfide catalysts supported on Al 2 O 3 , Nb 2 O 5 and Nb 2 O 5 -Al 2 O 3 . Catalysts activity is enhanced when Mo phase is deposited on niobium-containing support. For HDS and for the hydrogenation route of DMA decomposition, the niobiumcontaining support strongly contributes to the catalyst activity whereas the activity of the Mo phase per Mo atom decreases with the increase of niobium amount in the support. By contrast, as for the DMA route, which leads to xylene formation (XYL), the activity of the Mo sulfide phase per Mo atom is strongly enhanced. The electronic properties of the MoS 2 phase were studied by means of IR spectroscopy of CO adsorption. Comparison of m(CO/Mo) wavenumbers reveals an upward shift when Mo sulfide phase is deposited on Nb-containing support. The modification of the electronic properties of the sulfide phase is related to an interaction Mo-Nb either through the formation of a mixed Mo-Nb sulfide phase, or through the interaction MoS 2 slabs -support whose strength depends on the support acidity. Hence, the beneficial effect for xylene formation route is attributed to a decrease of the electron density of the Mo sulfide phase that should strengthen the DMA adsorption on the sulfide phase.

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Section: Discussioncontrasting

confidence: 69%

Section: Ftir Spectroscopy Of Adsorbed Comentioning

confidence: 99%

Effect of the electronic properties of Mo sulfide phase on the hydrotreating activity of catalysts supported on Al2O3, Nb2O5 and Nb2O5/Al2O3

Rocha¹,

Faro²,

Oliviero

et al. 2006

Catal Lett

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“…We also used this method for introducing molybdenum in a series of b-zeolites of various acidic properties: the parent bzeolite with a Si/Al ratio of 13.8, two partially dealuminated zeolites (Si/Al = 15.0 and 18.7) and a fully dealuminated one (Si/ Al ratio > 800) [8]; depending on the acidity of the supports, we obtained highly active catalysts for tetralin hydrogenation. However, the distribution of MoS 2 was not as uniform as expected since part of it was clearly located on the external surface of the zeolite particles and a small fraction inside the particles.…”

Section: Introductionmentioning

confidence: 99%

“…We have studied, mainly by EXAFS and TEM, the different steps of incorporation of Mo into the b-zeolites used in our former study [8], i.e., partially dealuminated or not. Since the catalysts prepared by Taniguchi et al were thermally treated under an inert gas before catalytic activities measurements and not under H 2 /H 2 S, we paid a particular attention to the characterization of the catalyst precursor after this inert gas treatment.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of molybdenum sulfide supported on β-zeolites obtained from [Mo3S4(H2O)9]4+ precursor

Hédoire

Cadot

Villain

et al. 2006

Applied Catalysis A: General

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“…The support can influence the interaction between its surface and the active phase, the dispersion, degree of sulfurization, stability, and structure of the active phase, etc. [15,16,17,18]. Therefore, the aim of this work is to study the effect of support (TiO 2 , Al 2 O 3 , SiO 2 and ZrO 2 ) on conversion of quinoline using Re sulfide as active phase.…”

Section: Introductionmentioning

confidence: 99%

SUPPORT EFFECT ON CONVERSION OF QUINOLINE OVER ReS2 CATALYST

Bassm

Villarroel

Gil-Llambías

et al. 2016

J. Chil. Chem. Soc.

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The conversion of quinoline over ReS 2 supported on g-Al 2 O 3 , SiO 2 , ZrO 2 and TiO 2 catalysts in a batch reactor at 300•C and 5 MPa of hydrogen pressure was studied. The catalysts were prepared by wet impregnation with a loading of 1.5 atoms of Re per nm 2 of support. The catalysts were characterized by N 2 adsorption, X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD). The Re(x)/supports catalysts displayed high activities for the conversion of quinoline, although negligible formation of N-free compounds (hydrodenitrogenation) were observed. The intrinsic activities of ReS 2 were modified by the support decreased in the order: Re/TiO 2 > Re/ZrO 2 > Re/SiO 2 > Re/g-Al 2 O 3 . The highest activity displayed by the Re/TiO 2 catalyst was correlated with the Re dispersion and formation of ReS 2 species. Meanwhile, the lower conversion of quinoline over the Re/ZrO 2 , Re/SiO 2 and Re/g-Al 2 O 3 catalysts was related to the combined effect of the textural properties of catalysts and the formation of ReS (2-x) species on the supports.

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Support effect in hydrotreating catalysts: hydrogenation properties of molybdenum sulfide supported on β-zeolites of various acidities

Cited by 77 publications

References 14 publications

Effect of the electronic properties of Mo sulfide phase on the hydrotreating activity of catalysts supported on Al2O3, Nb2O5 and Nb2O5/Al2O3

Effect of the electronic properties of Mo sulfide phase on the hydrotreating activity of catalysts supported on Al2O3, Nb2O5 and Nb2O5/Al2O3

Preparation and characterization of molybdenum sulfide supported on β-zeolites obtained from [Mo3S4(H2O)9]4+ precursor

SUPPORT EFFECT ON CONVERSION OF QUINOLINE OVER ReS2 CATALYST

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