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Deactivation and decoking of a naphtha reforming catalyst

Title data

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

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 05 May 2015 09:42
Last Modified: 16 Sep 2016 10:44
URI: https://eref.uni-bayreuth.de/id/eprint/11767