IR Spectroscopic
Evidence for MoS<sub>2</sub> Morphology
Change with Sulfidation Temperature on MoS<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> Catalyst
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Abstract
Low temperature CO
adsorption followed by IR spectroscopy (IR/CO)
characterization was used to depict the MoS<sub>2</sub> morphology
change with sulfidation temperature on MoS<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> catalyst. It is found that the morphology of MoS<sub>2</sub> slabs on MoS<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> catalyst
under typical sulfidation temperature range (573 to 723 K) is a truncated
triangle exposing both the M-edge and S-edge. Moreover, the IR/CO
data indicate that the truncation degree (ratio of S-edge/M-edge)
of MoS<sub>2</sub> slabs gradually increases with increasing sulfidation
temperature. This finding is in line with density functional theory
calculation on model catalysts, providing IR evidence of MoS<sub>2</sub> morphology change with sulfidation temperature on an Al<sub>2</sub>O<sub>3</sub>-supported catalyst. As a further step, it is also found
that the MoS<sub>2</sub> morphology is strongly influenced by MoS<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> interactions under the
same sulfidation temperature