Magnifying the morphology change induced by a nickel promoter in tungsten(IV) sulfide industrial hydrocracking catalyst : a HAADF-STEM and DFT study. - Archive ouverte HAL Access content directly
Journal Articles ChemCatChem Year : 2014

Magnifying the morphology change induced by a nickel promoter in tungsten(IV) sulfide industrial hydrocracking catalyst : a HAADF-STEM and DFT study.

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Abstract

Changes in the two-dimensional (2D) morphology of nonpromoted WS2 and Ni-promoted WS2 (NiWS) catalytically active nanolayers supported on amorphous silica-alumina (ASA) are revealed by aberration-corrected scanning transmission electron microscopy and rationalized by density functional theory calculations. The presence of the Ni atoms modifies the triangular shape of nonpromoted WS2/ASA nanolayers into a more hexagonal one for NiWS/ASA by stabilizing the S edge more strongly than the W edge. The higher catalytic activity induced by the addition of the promoter confirms the relevance of such a morphology effect for industrial catalysts.

Dates and versions

hal-01052710 , version 1 (28-07-2014)

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Maria Girleanu, Thibault Alphazan, Zoubeyr Boudene, Audrey Bonduelle-Skrzypczak, Christèle Legens, et al.. Magnifying the morphology change induced by a nickel promoter in tungsten(IV) sulfide industrial hydrocracking catalyst : a HAADF-STEM and DFT study.. ChemCatChem, 2014, 6 (6), pp.1594-1598. ⟨10.1002/cctc.201402115⟩. ⟨hal-01052710⟩
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