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Steam reforming of toluene over perovskite-supported Ni catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40564 45858 2013 8 PDF Available
Title
Steam reforming of toluene over perovskite-supported Ni catalysts
Abstract

Hydrogen production by steam reforming of toluene as a model aromatic hydrocarbon has been investigated with various Ni/perovskite catalysts. Among them, Ni/LaAlO3 catalyst showed high catalytic activity. Partial substitution of the La site of LaAlO3 support with other elements (Sr, Ba or Ca) was conducted for the Ni/LaAlO3 catalyst, and substitution with 30% Sr promoted catalytic activity and selectivity to hydrogen. Optimization for the Ni loading amount over Ni/La0.7Sr0.3AlO3−δ catalyst revealed that 5 wt% Ni/La0.7Sr0.3AlO3−δ had the highest toluene conversion and the smallest amount of carbon deposition. To elucidate the role of doped Sr, the catalytic natures of Sr-substituted catalyst Ni/La0.7Sr0.3AlO3−δ and Sr-supported catalyst Ni/Sr/LaAlO3 were compared. Results show that Sr-ions should be incorporated in the LaAlO3 perovskite structure to show high catalytic performance. Based on results of transient response test with H218O on Ni/La0.7Sr0.3AlO3−δ, Ni/Sr/LaAlO3, and Ni/LaAlO3 at reaction temperature of 873 K, the formation of 18O-products was observed only on Ni/La0.7Sr0.3AlO3−δ catalyst derived from redox between the lattice oxygen in the perovskite and water. Lattice oxygen in the La0.7Sr0.3AlO3−δ support worked as active oxygen species to enhance its catalytic nature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (139 K)Download as PowerPoint slideHighlights► Steam reforming of toluene as a model of aromatic hydrocarbon for hydrogen production. ► Ni/La0.7Sr0.3AlO3−δ catalyst showed very high activity and stability, low coke-formation. ► Substituting Sr had a strong promotion effect, but impregnating Sr showed no promotion effect. ► Transient response tests using isotope revealed the lattice oxygen played an important role.

Keywords
Steam reforming; Hydrogen production; Perovskite oxide; Lattice oxygen; Coke-formation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 451, 31 January 2013, Pages 160–167
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