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Issue 2, 2017
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Temperature-induced deactivation mechanism of ZnFe2O4 for oxidative dehydrogenation of 1-butene

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Abstract

This paper describes the observation of an irregular decrease in 1-butene conversion during oxidative dehydrogenation over ZnFe2O4 in the production of 1,3-butadiene upon increasing the reaction temperature above 400 °C. Mono and multi-pulse adsorption and reoxidation were developed to determine the reaction mechanism that led to this phenomenon. Adsorbed species were found to be generated by 1-butene adsorption, which blocked the active sites, and with higher reaction temperatures, the surface reconstruction of the catalyst could lead to catalyst deactivation. Temperature-programmed oxidation revealed the correlation between different adsorbed species and the corresponding altered active sites. A temperature-induced surface reconstruction mechanism to explain the possible deactivation was then proposed and confirmed with X-ray photoelectron spectroscopy. The original spinel surface structure of the catalyst was transformed into cubic cells formed by Zn2+ and Fe2+ after the initiation of adsorption at high temperatures, which resulted in its final deactivation.

Graphical abstract: Temperature-induced deactivation mechanism of ZnFe2O4 for oxidative dehydrogenation of 1-butene

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Article information


Submitted
04 Oct 2016
Accepted
04 Jan 2017
First published
04 Jan 2017

React. Chem. Eng., 2017,2, 215-225
Article type
Paper

Temperature-induced deactivation mechanism of ZnFe2O4 for oxidative dehydrogenation of 1-butene

X. Li, D. Cheng, Z. Zhao, F. Chen and J. Gong, React. Chem. Eng., 2017, 2, 215
DOI: 10.1039/C6RE00179C

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