Catalytic and mass transport properties of ferrierites: The skeletal isomerization of butene

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Abstract

The catalytic activities of H-, Li,H- and Cs,H-ferrierites are compared for the skeletal isomerization of 1-butene. The activity has been determined as a function of time-on-stream at atmospheric pressure and 300 °C, using a 10% 1-butene/N2 flow at a 1-butene WHSV of 0.187 h-1. The micropore volumes of the catalysts were characterized by nitrogen adsorption at -196 deg;C. The frequency response (FR) method has been used to study the mass transport resistance of the catalysts using butane as the adsorptive. The volume and the transport resistance of the micropores was shown to depend on the amount and the type of extra-framework species in the sample, such as, extra-framework alumina (EFAl), alkali cation, and coke, formed in the reaction. Diffusion in the micropores was the slowest, rate-controlling step of the sorption process. The diffusivity was similar for the H- and the Li,H-forms, but was much lower for the Cs,H-forms and catalysts aged in the butene conversion reaction. After a period of continuous activity loss due to coke deposition the activity and selectivity of the catalysts were the same. The results support the notion that only the outer layer of the crystallites, presumably only the mouths of the pores participate in this catalytic butene conversion.

Original languageEnglish
Pages (from-to)2316-2322
Number of pages7
JournalStudies in Surface Science and Catalysis
Volume154 C
Publication statusPublished - 2004

Fingerprint

butenes
Isomerization
Butenes
Transport properties
isomerization
Mass transfer
transport properties
Catalysts
catalysts
Coke
coke
Catalyst activity
Catalyst selectivity
Aluminum Oxide
Alkalies
Crystallites
Catalyst supports
mouth
Atmospheric pressure
Frequency response

Keywords

  • 1-butene
  • Ferrierite
  • Li or Cs exchange
  • N adsorption
  • Rate-spectroscopy
  • Skeletal isomerization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

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title = "Catalytic and mass transport properties of ferrierites: The skeletal isomerization of butene",
abstract = "The catalytic activities of H-, Li,H- and Cs,H-ferrierites are compared for the skeletal isomerization of 1-butene. The activity has been determined as a function of time-on-stream at atmospheric pressure and 300 °C, using a 10{\%} 1-butene/N2 flow at a 1-butene WHSV of 0.187 h-1. The micropore volumes of the catalysts were characterized by nitrogen adsorption at -196 deg;C. The frequency response (FR) method has been used to study the mass transport resistance of the catalysts using butane as the adsorptive. The volume and the transport resistance of the micropores was shown to depend on the amount and the type of extra-framework species in the sample, such as, extra-framework alumina (EFAl), alkali cation, and coke, formed in the reaction. Diffusion in the micropores was the slowest, rate-controlling step of the sorption process. The diffusivity was similar for the H- and the Li,H-forms, but was much lower for the Cs,H-forms and catalysts aged in the butene conversion reaction. After a period of continuous activity loss due to coke deposition the activity and selectivity of the catalysts were the same. The results support the notion that only the outer layer of the crystallites, presumably only the mouths of the pores participate in this catalytic butene conversion.",
keywords = "1-butene, Ferrierite, Li or Cs exchange, N adsorption, Rate-spectroscopy, Skeletal isomerization",
author = "G. Onyesty{\'a}k and J. Valyon and P{\'a}ł, {Borb{\'e}ly G.} and Rees, {L. V C}",
year = "2004",
language = "English",
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TY - JOUR

T1 - Catalytic and mass transport properties of ferrierites

T2 - The skeletal isomerization of butene

AU - Onyestyák, G.

AU - Valyon, J.

AU - Páł, Borbély G.

AU - Rees, L. V C

PY - 2004

Y1 - 2004

N2 - The catalytic activities of H-, Li,H- and Cs,H-ferrierites are compared for the skeletal isomerization of 1-butene. The activity has been determined as a function of time-on-stream at atmospheric pressure and 300 °C, using a 10% 1-butene/N2 flow at a 1-butene WHSV of 0.187 h-1. The micropore volumes of the catalysts were characterized by nitrogen adsorption at -196 deg;C. The frequency response (FR) method has been used to study the mass transport resistance of the catalysts using butane as the adsorptive. The volume and the transport resistance of the micropores was shown to depend on the amount and the type of extra-framework species in the sample, such as, extra-framework alumina (EFAl), alkali cation, and coke, formed in the reaction. Diffusion in the micropores was the slowest, rate-controlling step of the sorption process. The diffusivity was similar for the H- and the Li,H-forms, but was much lower for the Cs,H-forms and catalysts aged in the butene conversion reaction. After a period of continuous activity loss due to coke deposition the activity and selectivity of the catalysts were the same. The results support the notion that only the outer layer of the crystallites, presumably only the mouths of the pores participate in this catalytic butene conversion.

AB - The catalytic activities of H-, Li,H- and Cs,H-ferrierites are compared for the skeletal isomerization of 1-butene. The activity has been determined as a function of time-on-stream at atmospheric pressure and 300 °C, using a 10% 1-butene/N2 flow at a 1-butene WHSV of 0.187 h-1. The micropore volumes of the catalysts were characterized by nitrogen adsorption at -196 deg;C. The frequency response (FR) method has been used to study the mass transport resistance of the catalysts using butane as the adsorptive. The volume and the transport resistance of the micropores was shown to depend on the amount and the type of extra-framework species in the sample, such as, extra-framework alumina (EFAl), alkali cation, and coke, formed in the reaction. Diffusion in the micropores was the slowest, rate-controlling step of the sorption process. The diffusivity was similar for the H- and the Li,H-forms, but was much lower for the Cs,H-forms and catalysts aged in the butene conversion reaction. After a period of continuous activity loss due to coke deposition the activity and selectivity of the catalysts were the same. The results support the notion that only the outer layer of the crystallites, presumably only the mouths of the pores participate in this catalytic butene conversion.

KW - 1-butene

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KW - Li or Cs exchange

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KW - Rate-spectroscopy

KW - Skeletal isomerization

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