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

• Published in: Journal of catalysis Vol. 207; no. 2; pp. 361 - 370
• Main Authors: Araki, Yasuhiro, Honna, Kosaku, Shimada, Hiromichi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 25.04.2002; Elsevier
• 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; orientation; hydrodesulfurization (HDS) catalysts; morphology; catalyst dispersion; Catalytic reaction; Hydrocarbon; Transition metal Compounds; Molybdenum sulfide; Experimental study; Condensed benzenic compound; Hydrogenation; Supported catalyst; Titanium Oxides; Heterogeneous catalysis; Molecular orientation; Preparation; Catalyst activity
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1006/jcat.2002.3534

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.