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Distribution of Metal Cations in Ni‐Mo‐W Sulfide Catalysts
Author(s) -
Hein Jennifer,
Gutiérrez Oliver Y.,
Schachtl Eva,
Xu Pinghong,
Browning Nigel D.,
Jentys Andreas,
Lercher Johannes A.
Publication year - 2015
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.201500788
Subject(s) - sulfide , dibenzothiophene , catalysis , hydrodesulfurization , stoichiometry , sulfur , metal , materials science , inorganic chemistry , nanoparticle , crystallography , chemistry , analytical chemistry (journal) , metallurgy , nanotechnology , organic chemistry
The distribution of metal cations and the morphology of unsupported NiMo, NiW, and NiMoW sulfide catalysts were explored qualitatively and quantitatively. In the bi‐ and trimetallic catalysts, Mo(W)S 2 nanoparticles are deposited on Ni sulfide particles of varying stoichiometry and sizes (crystalline Ni 9 S 8 , and Ni 3 S 4 were identified). These nanoparticles are stacks of Mo(W)S 2 slabs with varying size, degrees of bending and mismatch between the slabs. High resolution electron microscopy and X‐ray absorption spectroscopy based on particle modeling revealed a statistical distribution of Mo and W within individual layers in sulfide NiMoW, forming intralayer mixed Mo 1− x W x S 2 . Ni is associated with MoS 2 , WS 2 , and Mo 1− x W x S 2 creating Ni‐promoted phases. The incorporation of Ni at the edges of the slabs was the highest for sulfide NiMoW. This high concentration of Ni in sulfide NiMoW, as well as its long bent Mo 1− x W x S 2 slabs, were paralleled by the highest activity for nitrogen and sulfur removal from model hydrocarbons such as o ‐propylaniline and dibenzothiophene.