The effect of oxidation and resulfidation on (Ni/Co)MoS^sub 2^ hydrodesulfurisation catalysts

The effect of a sequential oxidation and resulfidation treatment on γ-Al2O3 supported (Ni/Co)MoS2 catalyst nanoparticles was investigated using (HR)TEM, XPS, and thiophene HDS catalytic performance experiments. Analysis of the HRTEM images revealed that, after initial sulfidation and oxidation, the...

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Bibliographic Details
Published inApplied catalysis. B, Environmental Vol. 243; p. 145
Main Authors Bremmer, G Marien, van Haandel, Lennart, Hensen, Emiel JM, Frenken, Joost WM, Kooyman, Patricia J
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 01.04.2019
Subjects
Aluminum oxide
Catalysis
Catalysts
Chemical composition
Comparative analysis
Image restoration
Molybdenum disulfide
Nanoparticles
Organic chemistry
Oxidation
Oxygen
Size effects
Slabs
Sulfidation
Transitional aluminas
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Summary:The effect of a sequential oxidation and resulfidation treatment on γ-Al2O3 supported (Ni/Co)MoS2 catalyst nanoparticles was investigated using (HR)TEM, XPS, and thiophene HDS catalytic performance experiments. Analysis of the HRTEM images revealed that, after initial sulfidation and oxidation, the resulfidation treatment restored the original slab length or increased it. The chemical composition of the samples, as determined by XPS, also slightly changed: the concentration of oxidic species increased, especially for the Ni promoter atoms. Comparing the catalytic HDS activity of the samples before and after the oxidation-resulfidation treatment showed that the catalysts were more than 20% more active after resulfidation. This increase in HDS activity is ascribed to a redistribution of the (Ni/Co)MoS2 slabs during the second sulfidation treatment, indicating a size effect.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2018.10.014