%0 Journal Article %T Magnifying the morphology change induced by a nickel promoter in tungsten(IV) sulfide industrial hydrocracking catalyst : a HAADF-STEM and DFT study. %+ Université de Strasbourg (UNISTRA) %+ IFP Energies nouvelles (IFPEN) %+ Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich) %+ Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) %A Girleanu, Maria %A Alphazan, Thibault %A Boudene, Zoubeyr %A Bonduelle-Skrzypczak, Audrey %A Legens, Christèle %A Gay, Anne-Sophie %A Copéret, Christophe %A Ersen, Ovidiu %A Raybaud, Pascal %< avec comité de lecture %@ 1867-3899 %J ChemCatChem %I Wiley %V 6 %N 6 %P 1594-1598 %8 2014-06-06 %D 2014 %R 10.1002/cctc.201402115 %K density functional calculations %K electron microscopy %K hydrotreatment %K NiWS %K silica alumina %Z Chemical Sciences/CatalysisJournal articles %X 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. %G English %L hal-01052710 %U https://ifp.hal.science/hal-01052710 %~ IFP %~ CNRS %~ UNIV-STRASBG %~ INC-CNRS %~ SITE-ALSACE