Acidity of SAPO and CoAPO molecular sieves and their activity in the hydroisomerization of n-heptane

M. Höchtl, A. Jentys, H. Vinek

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63 Scopus citations

Abstract

SAPO and CoAPO molecular sieves with AFI and AEL structure were synthesized. The incorporation of Co2+, the acidity and the accessibility of the active sites were investigated by temperature-programmed desorption of ammonia, infrared spectroscopy of the OH stretching vibrations and adsorption of probe molecules (pyridine, benzene and various octane isomers). The substitution of cobalt in AlPO4-5 and AlPO4-11 leads to a considerable increase in the strength of Brønsted acid sites compared with SAPO molecular sieves. In the isomerization of n-heptane over palladium-impregnated catalysts it could be shown that the higher acidity of CoAPO compared with SAPO molecular sieves is reflected in a higher activity and a slightly higher selectivity to dibranched isomers.

Original languageEnglish
Pages (from-to)271-285
Number of pages15
JournalMicroporous and Mesoporous Materials
Volume31
Issue number3
DOIs
StatePublished - 1 Nov 1999
Externally publishedYes

Keywords

  • AEL and AFI
  • Acid strength
  • Hydroisomerization
  • Infrared spectroscopy
  • SAPO and CoAPO

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