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Plasma-catalytic dry reforming of methane in an atmospheric dielectric barrier discharge: Understanding the synergistic effect at low temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
46097 46429 2012 10 PDF Available
Title
Plasma-catalytic dry reforming of methane in an atmospheric dielectric barrier discharge: Understanding the synergistic effect at low temperature
Abstract

A coaxial dielectric barrier discharge (DBD) reactor has been developed for plasma-catalytic dry reforming of CH4 into syngas over different Ni/γ-Al2O3 catalysts. Three different packing methods are introduced into the single-stage plasma-catalysis system to investigate the influence of catalysts packed into the plasma area on the physical properties of the DBD and determine consequent synergistic effects in the plasma-catalytic dry reforming reactions. Compared to the fully packed reactor, which strongly changes the discharge mode due to a significant reduction in the discharge volume, partially packing the Ni/γ-Al2O3 catalyst either in a radial or axial direction into the discharge gap still shows strong filamentary discharge and significantly enhances the physical and chemical interactions between the plasma and catalyst. Optical emission spectra of the discharge demonstrate the presence of reactive species (CO, CH, C2, CO2+ and N2+) in the plasma dry reforming of methane. We also find the presence of the Ni/γ-Al2O3 catalyst in the plasma has a weak effect on the gas temperature of the CH4/CO2 discharge. The synergistic effect resulting from the integration of the plasma and catalyst is clearly observed when the 10 wt% Ni/γ-Al2O3 catalyst in flake form calcined at 300 °C is partially packed in the plasma, showing both the CH4 conversion (56.4%) and H2 yield (17.5%) are almost doubled. The synergy of plasma-catalysis also contributes to a significant enhancement in the energy efficiency for greenhouse gas conversion. This synergistic effect from the combination of low temperature plasma and solid catalyst can be attributed to both strong plasma–catalyst interactions and high activity of the Ni/γ-Al2O3 catalyst calcined at a low temperature.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Plasma-catalytic dry reforming of methane and carbon dioxide with a Ni/alumina catalyst to give syngas. ► Low temperature (<300 °C) operation. ► Synergistic effect of combining plasma and catalyst gives increased conversions and improved energy efficiency.

Keywords
Plasma-catalysis; Synergistic effect; Dry reforming; Hydrogen; Optical emission spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 125, 21 August 2012, Pages 439–448
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