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Effect of stepwise sulfidation on a MoO3/CeO2–Al2O3 catalyst for sulfur-resistant methanation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40154 45845 2014 9 PDF Available
Title
Effect of stepwise sulfidation on a MoO3/CeO2–Al2O3 catalyst for sulfur-resistant methanation
Abstract

•Stepwise sulfidation methods were used on MoO3/CeO2–Al2O3 catalyst.•Stepwise sulfidation processes enhanced the methanation activity and stability.•Stepwise sulfidation decreased the damage to the textural structure of the catalyst.•Stepwise sulfidation decreased the damage to the CeO2 particles in the catalyst.•Stepwise sulfidation affected the CeO2 in the catalysts rather than the MoO3.

The effect of stepwise sulfidation on a MoO3/CeO2–Al2O3 catalyst for sulfur-resistant methanation was studied. The prepared catalysts were characterized using N2-physisorption (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), and temperature-programmed sulfidation (TPS). The methanation activities and stability of the one-step-sulfided MoO3/CeO2–Al2O3 catalysts were enhanced by stepwise sulfidation processes. The XRD, TEM, RS, and XPS results indicated that the enhancement in the stability of MoO3/CeO2–Al2O3 was caused by the reduction and sulfidation of the CeO2 particles, eliminating unstable CeO2 and driving the migration of Ce3+ and Al3+ ions. The catalyst subjected to stepwise sulfidation exhibited improved methanation activity because the stepwise sulfidation reduced the degree of CeO2 sulfidation and mitigated textural structure damage to the catalyst. Finally, a sulfidation mechanism for CeO2 and MoO3 was proposed.

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Keywords
Stepwise sulfidation; Sulfidation temperature; Catalytic activity; MoO3/CeO2–Al2O3 catalyst; Sulfur-resistant methanation.
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Effect of stepwise sulfidation on a MoO3/CeO2–Al2O3 catalyst for sulfur-resistant methanation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 469, 17 January 2014, Pages 89–97
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