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Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer-Tropsch synthesis

Titelangaben

Pöhlmann, Ferdinand ; Kern, Christoph ; Rößler, Stefan ; Jess, Andreas:
Accumulation of liquid hydrocarbons in catalyst pores during cobalt-catalyzed Fischer-Tropsch synthesis.
In: Catalysis Science & Technology. Bd. 6 (2016) Heft 17 . - S. 6593-6604.
ISSN 2044-4753
DOI: https://doi.org/10.1039/C6CY00941G

Abstract

In the literature, it is widely claimed that during the initial period of Fischer-Tropsch synthesis liquid higher hydrocarbons fill catalyst pores completely, at least at temperatures of less than 250 [degree]C at a typical pressure of about 2 MPa. This leads to diffusional restrictions in the porous network for particles with a size appropriate for industrial fixed-bed operation (>1 mm), whereby catalyst effectiveness and product selectivity are strongly affected. However, under industrially relevant reaction conditions, our experimental and theoretical investigations on the interplay of reaction and diffusion in cobalt catalyst particles reveal that the pores are only partly filled with liquid higher hydrocarbons even at a very long time on stream of months or more for a chain growth probability of below about 0.8. Experiments were conducted in a magnetic suspension balance using particles of so called "technical" size (in the regime of 1-3 mm, relevant for industrial application), and a mathematical model was developed describing quite accurately the formation, vaporization and accumulation of liquid products and their C-number distribution in the porous particle.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik > Lehrstuhl Chemische Verfahrenstechnik - Univ.-Prof. Dr.-Ing. Andreas Jess
Fakultäten
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 660 Chemische Verfahrenstechnik
Eingestellt am: 11 Aug 2016 06:25
Letzte Änderung: 11 Nov 2016 11:33
URI: https://eref.uni-bayreuth.de/id/eprint/34082