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Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
46027 46428 2013 10 PDF Available
Title
Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3
Abstract

The low temperature reforming of methane by carbon dioxide is studied over a calcium oxide promoted Ni catalyst supported on a tetragonal zirconia stabilized by lanthana, which presents an improved stability compared to the non-promoted catalyst. Steady-state catalytic activity measurements, diffuse reflectance infrared Fourier transform spectroscopic analysis and isotopic temporal analysis of products experiments reveal the occurrence of a bifunctional mechanism on the promoted catalyst: methane is activated on the Ni particles, carbon dioxide interacts with the calcium oxide to form carbonates which scavenge carbon from nickel at the Ni-O-Ca interphase, thus restoring Ni particles to the original state. This is assumed to hinder the formation of deactivating coke, which explains the improved catalytic stability of the promoted catalyst. The main route for the carbon deposit formation is found to be the methane cracking in spite of the low temperature reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► TAP investigation of the low temperature methane dry reforming reaction mechanism. ► Deactivating carbon deposits arise from methane cracking on nickel metal. ► Boudouard reaction does not occur in spite of the low temperature reaction. ► On Ni-ZrLa the reactants (CH4 and CO2) are activated on the metallic phase. ► On Ni-Ca-ZrLa the CO2 is activated on the promoter enabling a bifunctional mechanism.

Keywords
Dry reforming methane; TAP reactor; DRIFTS; Ni catalyst; Calcium oxide promoter
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Transient studies of low-temperature dry reforming of methane over Ni-CaO/ZrO2-La2O3
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 450–459
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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Full-text PDF Download
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