Abstract
Detailed structural characterization of Ni–W hydrocracking catalysts with different metal loading were investigated before and after sulfidation by XRD, NH 3-TPD, TPR, XPS and HRTEM, then their catalytic performances were examined by hydrocracking of n-dodecane. Increasing metal amount would lead to the increase in sulfidation of W phase and Ni phase, WS 2 slab length and stacking WS 2, the metal–support interaction became weaker and the reducibility of catalyst was improved, therefore, catalytic activity increased and reached an optimum at about 30 wt.% total metal oxides. Further increase in the metal content would lead to the multiple layer metal distribution and increasing WS 2 slab length and slab stacking degree to a higher extent, which would result in the decrease of metal active site at edge and corner site of WS 2 slabs, and finally decrease the catalytic activity.
Published Version
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