Abstract
To enhance our understanding of the effects of sulfur on the properties of Mo 2C and Pt/Mo 2C catalysts, methanol steam reforming rates were measured in the absence and presence of 5 ppm H 2S. Exposure to H 2S quickly deactivated the Mo 2C catalyst, although 60% of the initial rates were retained. Deactivation of the Pt/Mo 2C catalyst was more gradual and the pseudo-steady state rates approached those for the Mo 2C catalyst. Treatment in 15% CH 4 in H 2 at 590 °C for 4 h restored ∼100% and ∼15% of the initial rates for the Mo 2C and Pt/Mo 2C catalysts, respectively. X-ray photoelectron spectroscopy indicated domains of Mo 2C, MoS 2 and S-Mo on the Pt/Mo 2C catalyst surface, but no sulfur was observed on the Mo 2C catalyst surface. The results suggested that sulfur selectively poisoned some but not all of the active sites on Mo 2C, and irreversibly poisoned the Pt sites producing inactive PtS.
Published Version
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