Dehydrogenation of ethylbenzene over highly active and stable perovskite oxide catalyst - Effect of lattice oxygen on/in perovskite oxide and role of A/B site in perovskite oxide

Ryo Watanabe, Yasushi Sekine*, Jungo Kojima, Masahiko Matsukata, Eiichi Kikuchi

*この研究の対応する著者

研究成果: Article査読

25 被引用数 (Scopus)

抄録

Previously we reported that La0.8Ba0.2Fe 0.4Mn0.6O3-δ (LBFMO) perovskite oxide catalyst showed extremely high activity for dehydrogenation of ethylbenzene to produce styrene. The reaction mechanism of dehydrogenation of ethylbenzene over LBFMO catalyst and the role of A/B site cation in the perovskite were investigated using transient response experiments and thermogravimetric analyses in a H2O/H2 atmosphere. Results showed that the dehydrogenation of ethylbenzene over LBFMO perovskite catalyst proceeded via reduction-oxidation (redox) of the perovskite oxide in this temperature range (800-900 K). Thereby, oxidative dehydrogenation of ethylbenzene consumed lattice oxygen in the perovskite; the consumed lattice oxygen was regenerated by H 2O. We measured the lattice oxygen release rate and regenerating rate over LBFMO perovskite catalyst. The regeneration rate of lattice oxygen was almost equal to the formation rate of styrene in the steady state of the dehydrogenation reaction. Substituting the B site of perovskite with Fe has a stabilizing effect for the lattice oxygen in the perovskite, and enhanced the regeneration rate of lattice vacancy drastically using steam. We concluded that the better stability of LBFMO than that of other catalysts was derived from enhanced lattice oxygen regeneration in the perovskite.

本文言語English
ページ(範囲)66-72
ページ数7
ジャーナルApplied Catalysis A: General
398
1-2
DOI
出版ステータスPublished - 2011 5月 15

ASJC Scopus subject areas

  • 触媒
  • プロセス化学およびプロセス工学

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