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Hydrogen production through CO2 reforming of methane over Ni/CeZrO2/Al2O3 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
54137 46998 2014 7 PDF Available
Title
Hydrogen production through CO2 reforming of methane over Ni/CeZrO2/Al2O3 catalysts
Abstract

•Ni/CeZrO2 catalysts exhibited a higher OSC due to the formation of a ceria–zirconia solid solution.•Carbon deposition occurred over all catalysts.•Covering alumina with ceria–zirconia significantly decreased the amount of carbon deposited.•The higher oxygen mobility of the ceria–zirconia solid solution inhibited the formation of carbon.•The ceria zirconia improves the effectiveness of the carbon cleaning mechanism.

This work studied the performance of Ni/CexZr1−xO2/Al2O3 (x = 0.5; 0.75; 1.0) catalysts for the production of synthesis gas through CO2 reforming of CH4. Ni/Al2O3 and Ni/CeO2/Al2O3 catalysts exhibited an increase of methane and CO2 conversion at the beginning of reaction. For Ni/Ce0.75Zr0.25O2/Al2O3 and Ni/Ce0.50Zr0.50O2/Al2O3 catalysts, the conversion remained quite constant during the reaction. This result was associated with the oxidation of metallic Ni particles by CO2 from the feed. Ceria–zirconia support was preferentially oxidized, inhibiting the oxidation of the metallic phase. Carbon was formed over all catalysts. However, the amount of carbon deposits significantly decreased for Ni/Ce0.75Zr0.25O2/Al2O3 and Ni/Ce0.50Zr0.50O2/Al2O3 catalysts. This result was attributed to the high oxygen mobility of the homogeneous solid solution formed, which promoted the mechanism of carbon removal from the metallic particle.

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Keywords
CO2 reforming of methane; Ni/CexZr1−xO2/Al2O3 catalysts, Hydrogen production; Gas-to-liquid technology
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 228, 1 June 2014, Pages 138–144
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