Oxidative dehydrogenation of ethylbenzene over La0.8Ba0.2Fe0.4Mn0.6O3−δ perovskite oxide catalyst

Mukawa, Kei; Sumomozawa, Fumitaka; Kikuchi, Eiichi; Watanabe, Ryo; Sekine, Yasushi

doi:10.1016/j.apcata.2013.02.029

Cited by 1 publication

(1 citation statement)

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“…Modifying the activity of the lattice oxygen through A/B site substitution in perovskite enables the optimization of dehydrogenation performance. Watanabe et al − reported that La 0.8 Ba 0.2 Fe 0.4 Mn 0.6 O 3−δ showed 37% yield of styrene in ethylbenzene dehydrogenation, and Sr 0.6 Ba 0.4 Fe 0.6 Mn 0.4 O 3−δ achieved 29.2% styrene yield with a styrene selectivity of 96.6% at 540 °C. Moreover, the role of lattice oxygen in dehydrogenation has been confirmed by transient response experiments.…”

Section: Introductionmentioning

confidence: 99%

Lattice Oxygen Regulation of Perovskites for Chemical Looping Oxidative Dehydrogenation of Ethylbenzene to Styrene

Wang

Zhang

et al. 2023

ACS Sustainable Chem. Eng.

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The direct dehydrogenation process produces over 90% of global styrene. However, it is hampered by high energy consumption due to equilibrium limitation, a high steam/ethylbenzene feeding ratio, and complicated separation procedures. In this study, we propose the synthesis of a novel perovskitestructured metal oxide as the redox catalyst for chemical looping oxidative dehydrogenation (CL-ODH) of ethylbenzene into styrene. Lower ethylbenzene activation temperature and higher oxygen storage capacity contributing to high ethylbenzene conversion are achieved by Mn doping of the B site in SrFeO 3−δ , and styrene yield is further enhanced by Ba doping of the A site. The optimized Sr 0.8 Ba 0.2 Fe 0.2 Mn 0.8 O 3−δ catalyst exhibits favorable dehydrogenation activity but is deactivated in the first five redox cycles due to the severe carbonation and perovskite structure decomposition. The decarbonization treatment on the catalyst at 950 °C in an O 2 atmosphere restores the perovskite structure and dehydrogenation activity, resulting in 85% ethylbenzene conversion and 89% styrene selectivity at 550 °C. Ethylbenzene on the catalyst undergoes full combustion via adsorbed oxygen, ODH of ethylbenzene into styrene and H 2 O using lattice oxygen, and direct dehydrogenation without available lattice oxygen. The proposed redox catalyst demonstrates efficient conversion of ethylbenzene into styrene, showing great potential for the energy conservation and process intensification of styrene production.

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