Effect of crystallite size of SAPO-34 catalysts on their induction period and deactivation in methanol-to-olefin reactions

Kwang Young Lee, Ho Jeong Chae, Soon Yong Jeong, Gon Seo

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Methanol-to-olefin (MTO) reactions were investigated over three kinds of SAPO-34 catalysts with similar acidities but different crystallite sizes to elucidate the effect of crystallite size on their catalytic performance, especially in terms of the induction period and deactivation. The prepared SAPO-34 catalysts showed similar physical and chemical properties, except for their crystallite sizes. The catalyst composed of large crystallites (∼7 μm) was activated after a definite induction period and deactivated rapidly, while that composed of small crystallites (∼0.4 μm) achieved complete conversion without any appreciable induction period and retained its activity for a relatively long time. This variation in catalytic performance according to the crystallite size of the SAPO-34 catalysts was attributed to the number of accessible cages near their external surface and to the diffusion limitation of the materials. Simulated conversion profiles in the MTO reactions over different crystallite sizes supported this explanation.

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalApplied Catalysis A: General
Volume369
Issue number1-2
DOIs
Publication statusPublished - 2009 Nov 15

Keywords

  • Crystallite size
  • Deactivation
  • Induction period
  • Methanol-to-olefin (MTO)
  • SAPO-34

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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