Structure and activity of Ni/La0.7Sr0.3AlO3−δ catalyst for hydrogen production by steam reforming of toluene

Authors:  Daiki Mukai, Satoshi Tochiya, Yuki Murai, Masaya Imori, Yukihiro Sugiura, Yasushi Sekine

Abstract:
We investigated catalytic steam reforming of aromatic hydrocarbon using toluene as a model compound. Ni/La_0.7Sr_0.3AlO_3−δ catalyst showed high catalytic activity and low coke formation. Although the lattice oxygen in a perovskite-type support plays an important role for oxidizing CHx and coke precursor,the role of interaction between Ni and the support has not been clarified. In this study, Ni/La_0.7Sr_0.3AlO_3−δ catalyst calcined at various temperatures (1073, 1173, 1273 and 1373K) was prepared and used to elucidate the effect of Ni particle size on the lattice oxygen mobility. The Ni particle size increased concomitantly with increased calcination temperature, and the C₁ yield decreased from 72.9 to 15.5%. Enhancement of lattice oxygen mobility by the decrease of Ni particle size was observed by transient response tests using H₂ 18O over Ni/La_0.7Sr_0.3AlO_3−δ calcined at various temperatures. The interface between Ni and perovskite support played an important role for oxidizing coke precursor by lattice oxygen. 

Keywords:
Steam reforming of toluene
Ni catalyst
Perovskite-type oxide support
Lattice oxygen mobility

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Structure and activity of Ni/La0.7Sr0.3AlO3−δ catalyst for hydrogen production by steam reforming of toluene

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