Приказ основних података о документу

dc.creatorBukur, Dragomir B.
dc.creatorMandić, Miloš
dc.creatorTodić, Branislav
dc.creatorNikačević, Nikola
dc.date.accessioned2021-03-10T14:19:46Z
dc.date.available2021-03-10T14:19:46Z
dc.date.issued2020
dc.identifier.issn0920-5861
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/4452
dc.description.abstractIn this study we investigate performance characteristics (catalyst effectiveness, CH4 selectivity, and hydrocarbon product distribution) of with a highly active Co/Re/Al(2)O(3 )catalyst particle for Fischer-Tropsch synthesis. In numerical simulations we utilize kinetic parameters for CO consumption rate, CH4 formation rate and hydrocarbon formation rates (C-2+ hydrocarbons) determined from experiments with this catalyst to study effects of catalyst activity, catalyst particle shape (sphere, slab, solid and hollow cylinder), size (i.e. diffusion length), catalyst distribution (uniform vs. eggshell type distribution for a spherical particle) and process conditions (temperature, pressure, syngas composition and conversion level) on the catalyst performance. With increase in Thiele modulus (i.e. particle size at a fixed set of process conditions) we observe increasing H-2/CO ratio profile towards the center of the particle resulting in increase of local and average CH4 selectivity. The goal is to find conditions which allow one to use sufficiently large particles to reduce pressure drop, while avoiding negative influence of diffusional limitations on selectivity and activity. For each catalyst particle shape we determined values of Thiele modulus, i.e. characteristic length of diffusion, corresponding to the upper limit of the kinetic region, and investigated how it changes with operating conditions. We found that simultaneous increase of pressure and the use of syngas with H-2/CO feed ratio of 1.4-1.7 is the best strategy for mitigating the negative impact of intraparticle diffusional limitations on CH4 selectivity. For a spherical particle of 1 mm in diameter, one can achieve CH4 selectivity of 5.6% with catalyst effectiveness factor of 1.07 at the reactor inlet by operating at 50 bar, 473 K and H-2/CO = 1.4.en
dc.publisherElsevier, Amsterdam
dc.relationQatar National Research Fund (a member of the Qatar Foundation) [NPRP 7-559-2-211]
dc.rightsrestrictedAccess
dc.sourceCatalysis Today
dc.subjectFischer-Tropsch synthesisen
dc.subjectSingle cobalt catalyst particleen
dc.subjectIntraparticle diffusionen
dc.subjectCatalyst effectiveness factoren
dc.subjectMethane selectivityen
dc.titlePore diffusion effects on catalyst effectiveness and selectivity of cobalt based Fischer-Tropsch catalysten
dc.typearticle
dc.rights.licenseARR
dc.citation.epage155
dc.citation.other343: 146-155
dc.citation.rankM21
dc.citation.spage146
dc.citation.volume343
dc.identifier.doi10.1016/j.cattod.2018.10.069
dc.identifier.scopus2-s2.0-85056588794
dc.identifier.wos000519970100016
dc.type.versionpublishedVersion


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Приказ основних података о документу