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Deactivation and decoking of a naphtha reforming catalyst

Titelangaben

Jess, Andreas ; Hein, O. ; Kern, Christoph:
Deactivation and decoking of a naphtha reforming catalyst.
In: Studies in Surface Science and Catalysis. Bd. 126 (1999) . - S. 81-88.
ISSN 0167-2991
DOI: https://doi.org/10.1016/S0167-2991(99)80453-4

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Abstract

Summary The kinetics of decoking of two commercial naphtha reforming catalysts (Pt-Re-Al2O3) were investigated under isothermal conditions as well as with the non-isothermal ignition point method. The reaction rate of decoking is first order with respect both to the concentration of oxygen and to the carbon load. Two types of coke can be distinguished: A very reactive coke, which is rapidly burned off, and a coke, which is by a factor of 100 less reactive. The amount of the more reactive coke, which is (according to literature) formed on the metal sites, is small (0.3 gc/100 gcat), The decoking process is therefore determined by the reactivity of the coke formed on the acidic sites, especially for initial carbon loads, which are typical for the decoking of an industrial catalyst (>10 gc/100 gcat). The reactivity of the coke, which is almost equal for both catalysts, is quite high and in the order of a typical activated char coal. The kinetic parameters (activation energy, pre-exponential factor) are given. At temperatures of more than 400°C, pore diffusion limitations have to be considered. External diffusion limitations can be neglected, at least for temperatures of technical relevance, as the temperature should not exceed 550°C to avoid an irreversible deactivation of the catalyst.

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: Nein
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: 05 Mai 2015 09:42
Letzte Änderung: 16 Sep 2016 10:44
URI: https://eref.uni-bayreuth.de/id/eprint/11767