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31P MAS NMR

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Jesús Sanz – One of the best experts on this subject based on the ideXlab platform.

Roel Prins – One of the best experts on this subject based on the ideXlab platform.

Michel Ménétrier – One of the best experts on this subject based on the ideXlab platform.

Todd M. Alam – One of the best experts on this subject based on the ideXlab platform.

Daniele Nicosia – One of the best experts on this subject based on the ideXlab platform.

  • 31P MAS NMR and Raman study of a Co(Zn)MoP/γ-Al2O3 HDS catalyst precursor containing triethylene glycol
    Journal of Catalysis, 2005
    Co-Authors: Daniele Nicosia, Roel Prins
    Abstract:

    Abstract The effect of triethylene glycol on phosphate-doped Co(Zn)Mo catalysts supported on γ-Al2O3 was studied by means of 31P magic angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy. 31P MAS NMR experiments, carried out on ZnMo/γ-Al2O3 doped with phosphate and triethylene glycol, suggested that the P 2 Mo 5 O 23 6 − species that formed in the impregnation solution decomposed to monophosphate and an Anderson-type aluminum molybdate species on contact with the support. The presence of triethylene glycol favored the formation of polyphosphate and PMo 12 O 40 3 − heteropolymolybdate species, but no P 2 Mo 5 O 23 6 − was detected. The use of paramagnetic cobalt instead of zinc cations had a paramagnetic effect on the 31PNMR signal of the PMo 12 O 40 3 − , indicating that the PMo 12 O 40 3 − species are bound to the promoter atoms. The close proximity of the promoter and Mo allows a better decoration of MoS2 and improves the catalytic activity.

  • 31P MAS NMR and raman study of a co zn mop γ al2o3 hds catalyst precursor containing triethylene glycol
    Journal of Catalysis, 2005
    Co-Authors: Daniele Nicosia, Roel Prins
    Abstract:

    Abstract The effect of triethylene glycol on phosphate-doped Co(Zn)Mo catalysts supported on γ-Al2O3 was studied by means of 31P magic angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy. 31P MAS NMR experiments, carried out on ZnMo/γ-Al2O3 doped with phosphate and triethylene glycol, suggested that the P 2 Mo 5 O 23 6 − species that formed in the impregnation solution decomposed to monophosphate and an Anderson-type aluminum molybdate species on contact with the support. The presence of triethylene glycol favored the formation of polyphosphate and PMo 12 O 40 3 − heteropolymolybdate species, but no P 2 Mo 5 O 23 6 − was detected. The use of paramagnetic cobalt instead of zinc cations had a paramagnetic effect on the 31PNMR signal of the PMo 12 O 40 3 − , indicating that the PMo 12 O 40 3 − species are bound to the promoter atoms. The close proximity of the promoter and Mo allows a better decoration of MoS2 and improves the catalytic activity.