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Understanding the effects of sulfur on Mo2C and Pt/Mo2C catalysts: Methanol steam reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
41557 45893 2011 8 PDF Available
Title
Understanding the effects of sulfur on Mo2C and Pt/Mo2C catalysts: Methanol steam reforming
Abstract

To enhance our understanding of the effects of sulfur on the properties of Mo2C and Pt/Mo2C catalysts, methanol steam reforming rates were measured in the absence and presence of 5 ppm H2S. Exposure to H2S quickly deactivated the Mo2C catalyst, although 60% of the initial rates were retained. Deactivation of the Pt/Mo2C catalyst was more gradual and the pseudo-steady state rates approached those for the Mo2C catalyst. Treatment in 15% CH4 in H2 at 590 °C for 4 h restored ∼100% and ∼15% of the initial rates for the Mo2C and Pt/Mo2C catalysts, respectively. X-ray photoelectron spectroscopy indicated domains of Mo2C, MoS2 and S-Mo on the Pt/Mo2C catalyst surface, but no sulfur was observed on the Mo2C catalyst surface. The results suggested that sulfur selectively poisoned some but not all of the active sites on Mo2C, and irreversibly poisoned the Pt sites producing inactive PtS.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (147 K)Download as PowerPoint slideHighlights► Mo2C and Pt/Mo2C catalysts highly active for methanol steam reforming. ► Mo2C was partially tolerant to sulfur exposure and fully regenerable. ► Methanol decomposition sites appeared to be sulfur tolerant but water gas shift sites intolerant.

Keywords
Molybdenum carbide; Methanol steam reforming; Water–gas shift; Sulfur poisoning; H2S; Platinum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 401, Issues 1–2, 15 July 2011, Pages 29–36
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us