A unified theory of coking deactivation in a catalyst pellet

Biswas J. and Do D.D. (1987) A unified theory of coking deactivation in a catalyst pellet. The Chemical Engineering Journal, 36 3: 175-191. doi:10.1016/0300-9467(87)80024-2


Author Biswas J.
Do D.D.
Title A unified theory of coking deactivation in a catalyst pellet
Journal name The Chemical Engineering Journal
ISSN 0300-9467
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1016/0300-9467(87)80024-2
Open Access Status Not yet assessed
Volume 36
Issue 3
Start page 175
End page 191
Total pages 17
Subject 2200 Engineering
Abstract The optimal performance of a reforming process is a direct function of the coking deactivation of its catalyst; hence the need to establish a fundamental relationship between the macroscopic (measurable) catalyst activity and the coke content. A general theoretical deactivation model of a unimodal pellet has been derived. This model incorporates the effects of coke deposition on decreased active surface area, diffusion resistance of reactants and pore blockage. Previous models are shown to be inadequate and design criteria are given for a minimum acceptable pore size to prevent pore plugging. It is clearly shown that high surface area catalysts (of small pore size) are not always efficient under deactivating conditions owing to pore plugging. Transient catalyst coke uptake curves are shown to have two stages: an initial kinetics-controlled period followed by an apparently diffusion-controlled period. These principles have been extended to a bidispersed pellet, showing that a single-pore effective diffusivity model for a reforming catalyst is inaccurate for deactivation modelling. It is also shown that a bimodal catalyst has much higher efficiencies than unimodal catalysts from a process viewpoint.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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