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Development of a power-law expression for catalyst deactivation in liquid-phase isobutene alkylation

Sahebdelfar, S ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2003
  3. Abstract:
  4. The differential form of the decay law for a solid acid catalyst in liquid-phase alkylation of isobutane with butenes was investigated. A pseudo-first order expression for the intrinsic rate of the main reaction and a pseudo-second order one for the poisoning reaction were assumed. The role of intraparticle diffusion on the apparent deactivation behavior was studied through the Shell Progressive Model (SPM), as the overall reaction is severely diffusion limited. The decay rate law was found to be fourth order in pellet activity and second order in external butene concentration. The effect of pore-mouth plugging was also studied. It was shown that this phenomenon causes an increased deviation from the SPM predictions and lowers the average order of deactivation. An empirical order of deactivation of 2.3 was obtained for zeolites. This value, being considerably lower than four, implies appreciable pore-mouth plugging effects in the case of zeolite catalyzed alkylation
  5. Keywords:
  7. Source: Scientia Iranica ; Volume 10, Issue 3 , 2003 , Pages 334-340 ; 10263098 (ISSN)
  8. URL: https://www.sid.ir/en/Journal/ViewPaper.aspx?ID=97729