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Magnifying the Morphology Change Induced by a Nickel Promoter in Tungsten(IV) Sulfide Industrial Hydrocracking Catalyst: A HAADF‐STEM and DFT Study
Author(s) -
Girleanu Maria,
Alphazan Thibault,
Boudene Zoubeyr,
BonduelleSkrzypczak Audrey,
Legens Christèle,
Gay AnneSophie,
Copéret Christophe,
Ersen Ovidiu,
Raybaud Pascal
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402115
Subject(s) - catalysis , tungsten , materials science , nickel , density functional theory , morphology (biology) , scanning transmission electron microscopy , amorphous solid , transmission electron microscopy , hexagonal crystal system , sulfide , scanning electron microscope , enhanced data rates for gsm evolution , chemical engineering , nanotechnology , crystallography , chemistry , metallurgy , computational chemistry , composite material , organic chemistry , geology , paleontology , engineering , telecommunications , computer science
Changes in the two‐dimensional (2D) morphology of nonpromoted WS 2 and Ni‐promoted WS 2 (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 WS 2 /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.