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Ni/CeO2–Al2O3 catalysts for the dry reforming of methane: The effect of CeAlO3 content and nickel crystallite size on catalytic activity and coke resistance

Paper ID Volume ID Publish Year Pages File Format Full-Text
39141 45808 2015 11 PDF Available
Title
Ni/CeO2–Al2O3 catalysts for the dry reforming of methane: The effect of CeAlO3 content and nickel crystallite size on catalytic activity and coke resistance
Abstract

•Specific catalytic activity for the DRM increases with the nickel crystallite size.•Carbon deposits are greater on catalysts with larger Ni crystallite size.•CeAlO3 suppressed the deposition of graphite-like coke.•CeAlO3 is formed by reduction of CeO2−x species well dispersed on γ-Al2O3.•The citric acid method promotes small Ni crystallite and the formation of CeAlO3.

The catalytic performances of Ni/CeO2–Al2O3 catalysts for the dry reforming of CH4 (DRM) were investigated. Catalysts with different Ni dispersion and different amount of CeAlO3 species were prepared by different methods and characterized by BET, XRD, XPS, Raman, TPR and TPO techniques. Catalytic activity was studied during time on stream in the range 873–1073 K with a mixture of CH4:CO2:Ar = 40:40:20 vol.% and GHSV 90,000 cm3 g−1 h−1. The intrinsic catalytic activity increased with the increasing of Ni crystallite size. Carbon was deposited as nano-fibres and graphite when catalysts worked at lower temperature, and the largest amount was found on the catalyst with the largest Ni crystallite size. The formation of graphitic deposits is limited by the presence of CeAlO3 species formed during catalyst activation. CA preparation method results particularly attractive because it allows to obtain catalysts with small Ni crystallite size and high content of CeAlO3 species, which both have a role in suppressing the carbon deposition and therefore in obtaining stable catalytic performances.

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Keywords
Ni/CeO2–Al2O3; Dry reforming; Nickel particle size; CeAlO3; Carbon deposition
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Ni/CeO2–Al2O3 catalysts for the dry reforming of methane: The effect of CeAlO3 content and nickel crystallite size on catalytic activity and coke resistance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 500, 5 July 2015, Pages 12–22
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
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Any Questions? feel free to contact us