期刊
ACS CATALYSIS
卷 10, 期 13, 页码 7032-7042出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c01262
关键词
methane decomposition; bubble column reactor; molten salt; hydrogen; iron chloride
资金
- Energy & Biosciences Institute through the EBI-Shell program
- U.S. Department of Energy, Office of Science Basic Energy Sciences [DE-FG03-89ER14048]
- Materials Research Science and Engineering Center (MRSEC) at UC Santa Barbara through NSF [DMR 1720256, CNS 1725797]
Mixtures of molten iron-sodium-potassium chloride salts are found to be catalytic for methane pyrolysis. In a differential bubble column reactor, the apparent activation energy of the molten salt decreases from 301 kJ/mol for the eutectic NaCl-KCl to 171 kJ/mol for 3 wt % of iron-added as FeCl3. The solid carbon produced in the iron-containing salt mixture has a graphitic structure which is distinct from the more disordered carbon produced in the iron-free eutectic, suggesting a different solid carbon formation pathway. Results from H-D exchange investigations are consistent with a different reaction pathway for methane pyrolysis in the iron-containing NaCl-KCl melt than in the melt without Fe. The activity of the salt mixture was stable for over 50 h, producing molecular hydrogen and separable solid carbon. It is likely that the activity is due to the presence of Fe in molecular ions stabilized in the NaCl-KCl melt that facilitate the C-H bond activation in methane.
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