Steam reforming of toluene over perovskite-supported Ni catalysts

Yasushi Sekine, Daiki Mukai, Yuki Murai, Satoshi Tochiya, Yoshiyuki Izutsu, Kei Sekiguchi, Naomi Hosomura, Hirohisa Arai, Eiichi Kikuchi, Yukihiro Sugiura

Research output: Contribution to journalArticle

58 Citations (Scopus)

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/La0.7Sr 0.3AlO3-δ catalyst revealed that 5 wt% Ni/La 0.7Sr0.3AlO3-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/La 0.7Sr0.3AlO3-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 H 218O on Ni/La0.7Sr0.3AlO 3-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 La0.7Sr0.3AlO 3-δ support worked as active oxygen species to enhance its catalytic nature.

Original languageEnglish
Pages (from-to)160-167
Number of pages8
JournalApplied Catalysis A: General
Volume451
DOIs
Publication statusPublished - 2013 Jan 31

    Fingerprint

Keywords

  • Coke-formation
  • Hydrogen production
  • Lattice oxygen
  • Perovskite oxide
  • Steam reforming

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Sekine, Y., Mukai, D., Murai, Y., Tochiya, S., Izutsu, Y., Sekiguchi, K., Hosomura, N., Arai, H., Kikuchi, E., & Sugiura, Y. (2013). Steam reforming of toluene over perovskite-supported Ni catalysts. Applied Catalysis A: General, 451, 160-167. https://doi.org/10.1016/j.apcata.2012.11.005