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Effect of sulfidation temperature on the catalytic activity of MoO3/CeO2–Al2O3 toward sulfur-resistant methanation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40311 45849 2013 9 PDF Available
Title
Effect of sulfidation temperature on the catalytic activity of MoO3/CeO2–Al2O3 toward sulfur-resistant methanation
Abstract

•Effect of sulfidation temperature on MoO3/CeO2–Al2O3 for methanation was studied.•Parts of CeO2 on the surface of Al2O3 served as the support of active phase.•Interaction between active phase and CeO2 improved the catalytic activity.•The sulfidation of unstable CeO2 enhanced the stability of catalyst.

The effect of sulfidation temperature on the catalytic activity of MoO3/CeO2–Al2O3 toward sulfur-resistant methanation was studied. The prepared catalysts were characterized by N2 physisorption (BET), X-ray diffraction (XRD), Raman spectroscopy (RS), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The XRD and XPS results indicated that CeO2 was sulfided at sulfidation temperatures above 500 °C. During sulfidation at 500 °C or above, Ce3+ ions diffused into the catalyst, and/or Al3+ ions migrated to the surface of the catalyst. These two changes enhanced catalyst stability and decreased catalytic activity. The initial catalytic activity decreased as the sulfidation temperature increased. This decrease occurred for the following reasons: the decrease in BET surface area, the undesired sulfidation of CeO2 on the surface, and the crystallization of amorphous MoS2 to form MoS2 crystals. Finally, CeO2 and MoO3 sulfidation mechanisms were proposed for temperatures greater than 500 °C.

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Keywords
Sulfidation temperature; Catalytic activity; MoO3/CeO2–Al2O3 catalyst; Sulfur-resistant methanation
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Effect of sulfidation temperature on the catalytic activity of MoO3/CeO2–Al2O3 toward sulfur-resistant methanation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 466, 10 September 2013, Pages 224–232
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
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