Journal
CHEMCATCHEM
Volume 10, Issue 12, Pages 2700-2708Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201701892
Keywords
carbon nanotubes; coking; dispersion; Lewis acids; nickel oxide
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Funding
- Petroleum Research Fund of the American Chemical Society [53873]
- U.S. Department of Energy (DOE) Office of Basic Energy Science [DE-SC0016486]
- DOE Office of Science [DE-AC02-06CH11357]
- Office of Biological and Environmental Research
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Methane is converted over nickel on ceria zirconia (Ni/CZ) into ethane, aromatics, and hydrogen at steady state up to the thermodynamic limit at temperatures of 350 to 500 degrees C. At 450 and 500 degrees C, traces of ethylene are also produced. Ni/NiO particles activate methane and couple the resulting surface species to hydrocarbon products. Large Ni particles are responsible for the formation of carbonaceous deposits. Furthermore, aromatics are formed on these sites. Smaller Ni/NiO particles are responsible for the formation of ethane and ethylene and appear to provide sustained activity. It is suggested that these Ni sites are too small to assemble aromatic deposits, and hence they remain active throughout the reaction.
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