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

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

Research output: Contribution to journalArticle

93 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
Externally publishedYes

Fingerprint

Alkenes
Crystallite size
Olefins
Methanol
Catalysts
Crystallites
Acidity
Chemical properties
Physical properties

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Effect of crystallite size of SAPO-34 catalysts on their induction period and deactivation in methanol-to-olefin reactions. / Lee, Kwan Young; Chae, Ho Jeong; Jeong, Soon Yong; Seo, Gon.

In: Applied Catalysis A: General, Vol. 369, No. 1-2, 15.11.2009, p. 60-66.

Research output: Contribution to journalArticle

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AU - Seo, Gon

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AB - 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.

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