Formation and Catalytic Properties of Edge-Bonded Molybdenum Sulfide Catalysts on TiO2

The effect of preparation conditions (calcination atmosphere, sulfidation atmosphere, and sulfidation temperature) on the orientation of MoS2 clusters on TiO2 supports was studied. Edge-bonded MoS2 clusters formed when the catalyst was sulfided in a flow of H2S/N2 at 573 or 673 K. However, when sulf...

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Bibliographic Details
Published in:Journal of catalysis 2002-04, Vol.207 (2), p.361-370
Main Authors: Araki, Yasuhiro, Honna, Kosaku, Shimada, Hiromichi
Format: Article
Language:English
Subjects:
Catalysis
catalyst dispersion
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
hydrodesulfurization (HDS) catalysts
morphology
orientation
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The effect of preparation conditions (calcination atmosphere, sulfidation atmosphere, and sulfidation temperature) on the orientation of MoS2 clusters on TiO2 supports was studied. Edge-bonded MoS2 clusters formed when the catalyst was sulfided in a flow of H2S/N2 at 573 or 673 K. However, when sulfided in H2S/N2 at higher temperatures than 773 K, the edge-bonded MoS2 clusters transformed to highly aggregated basal-bonded MoS2 clusters. Catalytic activity tests, using hydrogenation of 1-methylnaphthalene as a model test reaction, revealed that the turnover frequency on the catalyst with edge-bonded MoS2 clusters prepared by sulfiding at 573 K in H2S/N2 was higher than that on the catalyst with basal-bonded MoS2 clusters prepared by sulfiding in H2S/H2.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.2002.3534