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A Single-Event MicroKinetic model for the cobalt catalyzed Fischer-Tropsch Synthesis.
- Source :
-
Applied Catalysis A: General . Aug2016, Vol. 524, p149-162. 14p. - Publication Year :
- 2016
-
Abstract
- The Single-Event MicroKinetic methodology has been successfully extended from Fe to Co catalyzed Fischer-Tropsch Synthesis. A total of 82 experiments were performed in a plug flow reactor with a H 2 to CO molar inlet ratio between 3 and 10, a temperature range from 483 to 503 K, CO inlet partial pressures from 3.7 to 16.7 kPa and space time varying between 7.2 and 36.3 (kg cat s) mol −1 . Via regression, statistically significant and physicochemically meaningful estimates were obtained for the activation energies in the model and the H, C and O atomic chemisorption enthalpies as required for the UBI-QEP method. A reaction path analysis allowed relating the observed deviations from the Anderson-Schulz-Flory distribution, i.e., a high methane and low ethene selectivity, to the symmetry numbers and a higher chemisorption enthalpy of the metal methyl species compared to the other metal alkyl species. Simulations at industrially relevant conditions show that, as a catalyst descriptor, the H atomic chemisorption enthalpy crucially determines both the CO conversion and the C 5+ selectivity. The higher FTS activity of Co compared to Fe is explained via the higher oxygen atomic chemisorption enthalpy on the latter compared to the former. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0926860X
- Volume :
- 524
- Database :
- Academic Search Index
- Journal :
- Applied Catalysis A: General
- Publication Type :
- Academic Journal
- Accession number :
- 117316707
- Full Text :
- https://doi.org/10.1016/j.apcata.2016.06.028