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- W2102636996 abstract "Although the Fluid Catalytic Cracking (FCC) is an economic important process, simulation of its kinetics is rather empiricalmainly it is a consequence of the complex interactions among operating variables and the complex kinetics that take place. A crucial issue is the inevitable catalyst reversible deactivation, consequence of both, coke (by-product) deposition on the catalyst surface (external) and inside the catalytic zeolite (internal). In order to tackle this problem, two main proposals to evaluate deactivation rate by coking have been extensively applied, both use a probability distribution function called the negative exponential functionone of them uses the time that catalyst has been in the reacting stream (named Time-on-Stream), and the other is related to the coke amount on/inside the catalyst (denoted as Coke-on-Catalyst). These two deactivation models can be unified by tracking catalyst activity as function of the decrease on effective diffusivity due to pore occlusion (external) by cokethis situation leads to an increase of Thiele modules and consequently a decrease of the effectiveness factor of each reaction. This tracking of catalyst activity incorporates, implicitly, rates of reaction and transport phenomena taking place in the catalyst pores and is therefore phenomenological rather than statistical. In this work, the activity profiles predicted previously are reproduced at MAT laboratory reactor. The same approach is used to model an industrial riser and the results are in agreement with previous reports." @default.
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- W2102636996 date "2010-02-18" @default.
- W2102636996 modified "2023-10-15" @default.
- W2102636996 title "Modelling Catalyst Deactivation by External Coke Deposition during Fluid Catalytic Cracking" @default.
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- W2102636996 doi "https://doi.org/10.2202/1542-6580.2198" @default.
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