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Role of support lattice oxygen on steam reforming of toluene for hydrogen production over Ni/La0.7Sr0.3AlO3−δ catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
40381 45852 2013 11 PDF Available
Title
Role of support lattice oxygen on steam reforming of toluene for hydrogen production over Ni/La0.7Sr0.3AlO3−δ catalyst
Abstract

Catalytic steam reforming of aromatic hydrocarbon using toluene as a model compound for hydrogen production over Ni catalyst supported on perovskite oxide was investigated. Ni/La0.7Sr0.3AlO3−δ catalyst showed higher activity and lower coke formation than other Ni-supported catalysts on hydrogen production by toluene steam reforming. Transient response using H218O revealed that the surface lattice oxygen of La0.7Sr0.3AlO3−δ worked as active oxygen by redox mechanism at 873 K. Coke deposited on the catalyst surface after the reaction was removed oxidatively by lattice oxygen in/on the perovskite support. The working temperature of the lattice oxygen depended on the catalyst support characteristics. Analyses of the support structure by XRD and XPS revealed that the lattice distortion and the increasing of oxygen vacancies by partial Sr substitution enhanced the redox ability of lattice oxygen. Arrhenius plots showed that the rate-determining step of the reaction changed at a certain temperature at which the lattice oxygen was able to contribute to reaction over Ni/La0.7Sr0.3AlO3−δ and Ni/LaAlO3. The dependence of the reaction rate on the partial pressure of H2O and toluene revealed that the rate-determining step might be the formation of hydroxyl group on the support surface in a lower temperature region and the adsorption of toluene on the Ni surface in a higher temperature region.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (140 K)Download as PowerPoint slideHighlights► Catalytic steam reforming of toluene for hydrogen production over Ni/perovskite. ► Higher activity and lower coke formation on Ni/La0.7Sr0.3AlO3−δ catalyst. ► Transient response using H218O revealed lattice oxygen played an important role. ► The rate-determining step of the reaction depended on the activity of lattice oxygen. ► Coke deposited was removed oxidatively by lattice oxygen in/on the perovskite support.

Keywords
Steam reforming of toluene; Ni catalyst; Perovskite-type oxide support; Partial Sr substitution; Lattice oxygen; Low coke formation
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Role of support lattice oxygen on steam reforming of toluene for hydrogen production over Ni/La0.7Sr0.3AlO3−δ catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 60–70
Authors
, , , , , , ,
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