The skeletal isomerization of n-butene over ferrierite catalysts

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13 Citations (Scopus)

Abstract

The catalytic properties of H-ferrierite zeolites, prepared by hydrothermal and dry-state synthesis, were compared in the skeletal isomerization of 1-butene. The activity was found to be strongly influenced by the presence of extra-framework Al (EFAl) species in the zeolite micropores and by the carbonaceous deposit formed during the reaction. The dynamics of mass transport in the zeolite crystallites were studied by the frequency-response (FR) method using acetylene, propane, n- and i-butane as probe molecules. The selectivity of n-butene conversion showed correlation with the dynamics of the n-butane sorption process. Either the diffusion or the sorption was the rate-controlling slowest step of n-butane mass transport, depending on the amount and the distribution of the EFAl species in the sample. In the catalyst sample, free of EFAl, the transport was found to be controlled by the rate of sorption. At an EFAl content of about 0.5-1.0 EFAl/unit cell the diffusion resistance of the micropores governed the n-butane transport rate.

Original languageEnglish
Pages (from-to)401-407
Number of pages7
JournalApplied Surface Science
Volume196
Issue number1-4
DOIs
Publication statusPublished - Aug 15 2002
Event4th International Symposium effects of Surface Hetrogeneity in Adsorption and Catalysis on Solids (ISSHAC IV) - Krakow, Poland
Duration: Aug 27 2001Aug 31 2001

Keywords

  • Diffusion of butanes
  • Frequency-response technique
  • H-ferrierite
  • Skeletal isomerization of l-butene

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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