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The oscillating Fischer-Tropsch reaction

Journal Article · · Science
 [1];  [2];  [3];  [4]
  1. Washington State Univ., Pullman, WA (United States)
  2. Washington State Univ., Pullman, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Institute for Integrated Catalysis
  3. Université Libre de Bruxelles, Brussels (Belgium)
  4. Washington State Univ., Pullman, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Institute for Integrated Catalysis; Université Libre de Bruxelles, Brussels (Belgium)
The mechanistic steps that underlie the formation of higher hydrocarbons in catalytic carbon monoxide (CO) hydrogenation at atmospheric pressure over cobalt-based catalysts (Fischer-Tropsch synthesis) have remained poorly understood. Here, we reveal nonisothermal rate-and-selectivity oscillations that are self-sustained over extended periods of time (>24 hours) for a cobalt/cerium oxide catalyst with an atomic ratio of cobalt to cerium of 2:1 (Co2Ce1) at 220°C and equal partial pressures of the reactants. A microkinetic mechanism was used to generate rate-and-selectivity oscillations through forced temperature oscillations. Experimental and theoretical oscillations were in good agreement over an extended range of reactant pressure ratios. Additionally, phase portraits for hydrocarbon production were constructed that support the thermokinetic origin of our rate-and-selectivity oscillations.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-76RL01830; FG02-05ER15712
OSTI ID:
2263294
Report Number(s):
PNNL-SA--193537
Journal Information:
Science, Journal Name: Science Journal Issue: 6666 Vol. 382; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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