Steam reforming of ethylene over manganese-chromium spinel oxides

Authors

Lu Yang, University of Virginia
Maxim Bukhovko, Georgia Institute of Technology
Gordon Brezicki, University of Virginia
Andrzej Malek, The Dow Chemical Company
Liwei Li, The Dow Chemical Company
Christopher Jones, Georgia Institute of Technology
Pradeep K. Agrawal, Michigan Technological UniversityFollow
Robert Davis, University of Virginia

Document Type

Article

Publication Date

12-2019

Department

Department of Chemical Engineering

Abstract

A series of Mn-Cr-O spinel catalysts of different stoichiometry was synthesized using a sol-gel method and characterized using X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, N₂ and H₂O adsorption, and H₂-temperature programmed reduction. The introduction of extra Mn to stoichiometric MnCr₂O₄ led to Mn³⁺ substitution in the spinel lattice of Mn_1.5Cr_1.5O₄ whereas excess Cr in Mn_0.5Cr_2.5O₄ formed Cr₂O₃. Ethylene steam reforming at atmospheric total pressure and 873 K over the Mn-Cr-O spinel catalysts was nearly first order in ethylene, negative order in water and zero order in excess dihydrogen. The reaction kinetics were consistent with a Mars-van Krevelen type mechanism. Whereas Cr₂O₃ was nearly inactive for ethylene steam reforming, Mn₃O₄ was substantially more active than the spinel catalysts, but Mn₃O₄ deactivated significantly upon in situ reduction to MnO. The spinel catalysts were therefore more active and structurally stable for ethylene steam reforming than either of the pure metal oxides.

Publisher's Statement

Corrigendum: https://doi.org/10.1016/j.jcat.2021.01.005

Publication Title

Journal of Catalysis

Recommended Citation

Yang, L., Bukhovko, M., Brezicki, G., Malek, A., Li, L., Jones, C., Agrawal, P., & Davis, R. (2019). Steam reforming of ethylene over manganese-chromium spinel oxides. Journal of Catalysis, 380, 224-235. http://doi.org/10.1016/j.jcat.2019.10.006
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/1319