The reformer lineout phenomenon and its fundamental importance tocatalyst deactivation

Biswas J., Gray P.G. and Do D.D. (1987) The reformer lineout phenomenon and its fundamental importance tocatalyst deactivation. Applied Catalysis, 32 C: 249-274. doi:10.1016/S0166-9834(00)80629-6


Author Biswas J.
Gray P.G.
Do D.D.
Title The reformer lineout phenomenon and its fundamental importance tocatalyst deactivation
Journal name Applied Catalysis   Check publisher's open access policy
ISSN 0166-9834
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1016/S0166-9834(00)80629-6
Volume 32
Issue C
Start page 249
End page 274
Total pages 26
Subject 2200 Engineering
Abstract The transient kinetic behaviour of a fresh or pre-sulphided catalystbrought on-line, which is termed 'lineout', is found to be due to an initial deposition of coke on the metal sites of the catalyst (~ 1 wt %), the quantity of this deposition being essentially constant over the length of reformer operation. The coke deposition during long term reformer operation (~ 20 wt %) is found to be on the alumina; however the observed deactivation in octane yields is due to the change in nature of coke (gradual graphitization) on the metal sites of the catalyst. Thus two types of coke on the metal sites are distinguished, one being easily removed by hydrogen (reversible coke), and the other less readily removed (irreversible coke). The quantity of irreversible coke is increased by operation at high temperatures and/or low pressures. Mechanisms of coking are given and it is shown that catalyzed hydrogenation and hydrogasification limit metal site catalyst deactivation. These coke removal mechanisms are discussed in detail and a model is developed to predict the unsteady coking during lineout and the graphitization behaviour at longer times.
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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Created: Tue, 28 Jun 2016, 14:35:20 EST by System User