SAPO-18 and SAPO-34 catalysts for propylene production from the oligomerization-cracking of ethylene or 1-butene

Eva Epelde, María Ibáñez, José Valecillos, Andrés T. Aguayo, Ana G. Gayubo, Javier Bilbao, Pedro Castaño*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The performance of SAPO-18 and SAPO-34 catalysts has been compared during the conversion of ethylene or 1-butene to propylene. This comparison has been made in terms of activity (conversion), selectivity and stability against coke deposition. The SAPOs were synthesized, agglomerated, calcined, characterized and tested in a fixed-bed reactor at 500 °C. The spent catalysts (after 5 h on stream) were characterized to assign the location and nature of coke. The results point to the higher activity and stability of SAPO-18 catalyst in the conversions of each reactant (ethylene or 1-butene), which has been explained on the basis of its acidity, pore topology and above all, the faster diffusion of aromatics causing deactivation. Thus, the SAPO-18 catalyst suffers slower coke deposition, while this coke is of lighter nature (more aliphatic and less aromatic). The advantages of SAPO-18 over SAPO-34 catalyst are more relevant for the transformation of 1-butene, where the propylene selectivity and yield increase over time, as secondary reactions are selectively neglected and coke condensation is slowed down.

Original languageEnglish (US)
Pages (from-to)176-182
Number of pages7
JournalApplied Catalysis A: General
Volume547
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Keywords

  • AEI structure
  • CHA structure
  • Coke deactivation
  • Light olefins
  • Oligomerization-cracking
  • Propene

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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