Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 260, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118132
Keywords
Electric field; Methane steam reforming; Coke; Steam-to-methane ratio
Funding
- National Science Foundation Graduate Research Fellowship [1347973]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Biosciences and Geosciences [DE-SC0014560]
- Research and Development Program of the Korea Institute of Energy Research (KIER) [B9-2442-05]
- DeVlieg Foundation
- U.S. Department of Energy (DOE) [DE-SC0014560] Funding Source: U.S. Department of Energy (DOE)
- Direct For Education and Human Resources
- Division Of Graduate Education [1347973] Funding Source: National Science Foundation
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Electric fields were applied to an unsupported nickel catalyst during methane steam reforming with a low steam-to-methane ratio of 2:1. As expected, catalysts operated in standard mode (without an applied field) experienced high levels of coking. Coke formation was almost completely suppressed by the application of a positive electric field. This is explained using density functional theory computations which indicate that positive electric fields (1) increase the affinity for water adsorption on the surface, thereby increasing the amount of oxygen available to remove carbon, (2) stabilize individual carbon fragments, thus reducing their tendency to polymerize, and (3) increase the oxygen storage capabilities of the catalyst by inducing sub-surface oxygen formation and bulk oxidation.
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