Dehydrogenation of ethylbenzene over La0.8Ba0.2Fe0.4Mn0.6O3−δ perovskite oxide catalyst working by redox mechanism using steam and lattice oxygen

Authors:  Ryo Watanabe, Kei Mukawa, Jungo Kojima, Eiichi Kikuchi, Yasushi Sekine

Abstract:
Details of the reaction mechanism of ethylbenzene (EBDH) dehydrogenation were investigated using kinetic analyses of highly active and stable La_0.8Ba_0.2Fe_0.4Mn_0.6O_3−ı (LBFMO) perovskite oxide catalyst with a quadrupole mass spectrometer by measuring the instantaneous behavior. Under EBDH with a steam condition, the stoichiometric factor of oxygen in LBFMO catalyst in the steady-state reaction was found to be 2.927, which is lower than 3. The catalyst worked in the reduced state in which a few layers of lattice oxygen were consumed, supported by X-ray photoelectron spectroscopic analyses. Additionally, the reactive lattice oxygen and vacancy were involved with the reduction–oxidation (redox) mechanism of EBDH with steam. The respective amounts were 17.0 mmol mol-cat−1 for available lattice oxygen and 68.5 mmol mol-cat⁻¹ for vacancy over LBFMO under the steady state condition. LBFMO catalyst showed high and stable EBDH activity by virtue of the redox mechanism using this lattice oxygen and vacancy.

Keywords:
Ethylbenzene dehydrogenation
Perovskite-type oxide
Redox mechanism
Lattice oxygen
Kinetic analyses

Published in: Applied catalysis A: General  (Volumes 462–463, Pages 1-310, 10 July 2013)

Publisher: Elsevier      

ISSN Information: 0926-860X

Dehydrogenation of ethylbenzene over La0.8Ba0.2Fe0.4Mn0.6O3−δ perovskite oxide catalyst working by redox mechanism using steam and lattice oxygen

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