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The effect of preparation conditions (calcination atmosphere, sulfidation atmosphere, and sulfidation temperature) on the orientation of MoS 2 clusters on TiO 2 supports was studied. Edge-bonded MoS 2 clusters formed when the catalyst was sulfided in a flow of H 2 S/N 2 at 573 or 673 K. However, when sulfided in H 2 S/N 2 at higher temperatures than 773 K, the edge-bonded MoS 2 clusters transformed to highly aggregated basal-bonded MoS 2 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 MoS 2 clusters prepared by sulfiding at 573 K in H 2 S/N 2 was higher than that on the catalyst with basal-bonded MoS 2 clusters prepared by sulfiding in H 2 S/H 2 . |
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