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Modeling of catalyst deactivation in zeolite-catalyzed alkylation of isobutane with 2-butene

Hamzehlouyan, T ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ces.2009.08.022
  3. Abstract:
  4. The deactivation of solid acid catalysts in liquid phase alkylation of isobutane with 2-butene was investigated. Since under liquid phase conditions the alkylation reaction is severely diffusion limited, effects of diffusion on the rate of reaction and deactivation pathways were considered. In the present work, an attempt has been made to implement more appropriate assumptions in order to properly model catalyst deactivation in a mixed reactor. Accordingly, spatial variation of diffusivity in the pores of the catalyst was considered as a function of time on stream. The effect of the pore mouth plugging was also investigated and it was found that this phenomenon had a pronounced effect on the deactivation behavior of the catalyst. An empirical order of deactivation was determined through a power-law expression for alkylation over a faujasite (FAU) zeolite
  5. Keywords:
  6. Kinetics ; 2-butene ; Alkylation reactions ; Deactivation pathways ; Diffusion limited ; Diffusivities ; Faujasites ; Function of time ; Isobutane alkylation ; Isobutanes ; Kinetics modeling ; Liquid phase conditions ; Liquid-phase alkylation ; Mixed reactors ; Model catalysts ; Modeling ; Power-law expression ; Rate of reaction ; Solid acid catalysts ; Spatial variations ; Alkylation ; Butane ; Butenes ; Catalysis ; Catalyst poisoning ; Diffusion ; Hydrocarbons ; Liquids ; Silicate minerals ; Zeolites ; Catalyst deactivation
  7. Source: Chemical Engineering Science ; Volume 65, Issue 2 , 2010 , Pages 645-650 ; 00092509 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0009250909005703