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Effect of catalyst structure on steam reforming of toluene over Ni/La0.7Sr0.3AlO3−δ catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
39405 45822 2015 7 PDF Available
Title
Effect of catalyst structure on steam reforming of toluene over Ni/La0.7Sr0.3AlO3−δ catalyst
Abstract

•Steam reforming of toluene as a model of biomass tar was conducted over Ni/La0.7Sr0.3AlO3−δ.•Carbon deposition was suppressed by oxidation of surface carbon species with lattice oxygen.•The interaction between Ni and support was investigated by STEM and isotope transient tests.•Catalytic activity depended on the number of surface site on Ni particle.•Carbon removal depended on the oxygen release rate at perimeter of Ni and support.

We investigated steam reforming of toluene as a biomass tar model on Ni/La0.7Sr0.3AlO3−δ, which has high activity and low carbon deposition for hydrogen production. Carbon deposition was suppressed by the oxidation of surface carbon species with lattice oxygen on support. The effects of Ni particle size and support surface area on catalytic features were evaluated by varying the calcination temperature of supported Ni and perovskite support independently. Activity tests, isotopic transient response tests, and characterization were performed to ascertain how interaction between Ni and support contributes to this reaction. Additionally, we evaluated the catalytic activity and carbon deposition per unit of Ni surface and perimeter. The lattice oxygen release rate depends on the specific surface area of the support, Ni-support interface, and catalyst structure. High surface area of the support accelerates the exchange of lattice oxygen through the redox cycle during steam reforming. Furthermore, the larger interface between Ni and support enables rapid lattice oxygen release. When the lattice oxygen release rate was higher, the catalytic activity was higher and carbon deposition was lower for each catalyst. These results confirm that lattice oxygen plays an important role in the activation of toluene and removal of carbon deposition on supported Ni.

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Keywords
Perovskite oxide; Steam reforming of toluene; Ni catalyst; Hydrogen production; Metal particle size; Specific surface area.
First Page Preview
Effect of catalyst structure on steam reforming of toluene over Ni/La0.7Sr0.3AlO3−δ catalyst
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 155–161
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis