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Superior catalytic behavior of trace Pt-doped Ni/Mg(Al)O in methane reforming under daily start-up and shut-down operation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43298 45962 2008 12 PDF Available
Title
Superior catalytic behavior of trace Pt-doped Ni/Mg(Al)O in methane reforming under daily start-up and shut-down operation
Abstract

Doping effects of Pt and Ru on Ni/Mg(Al)O catalysts were compared in daily start-up and shut-down operations of steam reforming of CH4. Trace Pt-doped catalyst showed better behavior than trace Ru-doped catalyst; the former was self-activated but the latter was not, although both exhibited self-regenerative activity. Moreover, the former exhibited sustainable activity, although the latter was quickly passivated, in the autothermal reforming of CH4. Formation of Pt–Ni alloy on the surface of fine Ni metal particles on the catalysts was suggested by EXAFS analyses. CH4 was dissociatively activated to form hydrogen on Pt, assisted by adsorbed O or OH species, leading to the self-activation via Ni reduction by hydrogen spillover from Pt. The self-regeneration of the Pt–Ni/Mg(Al)O catalysts can be achieved by the continuous rebirth of active Ni metal species via reversible reduction–oxidation between Ni0 and Ni2+ in/on Mg(Ni,Al)O periclase assisted by the hydrogen spillover.

Graphical abstractTrace Pt-doped Ni0.5/Mg2.5(Al)O catalyst prepared by adopting the “memory effect” of hydrotalcite showed self-activation as well as regenerative activity not only in the steam reforming but also in autothermal reforming of methane with daily start-up and shut-down operation.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
CH4 reforming; Self-activation; Self-regeneration; Ni/Mg(Al)O catalyst; Pt doping; Daily start-up and shut-down operation
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Superior catalytic behavior of trace Pt-doped Ni/Mg(Al)O in methane reforming under daily start-up and shut-down operation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 350, Issue 2, 30 November 2008, Pages 225–236
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