Physicochemical and catalytic properties of SAPO-31 materials prepared from the silica sources characterized by a different degree of polymerization

M. Yu Smirnova, M. G. Davydova, A. I. Titkov, A. B. Ayupov, O. V. Kikhtyanin

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Two series of microporous silicoaluminophosphates SAPO-31 with different Si content (Si/Al = 0—0.5) were synthesized using silica sources characterized by various degree of polymerization (fumed silica and tetraethoxysilane). Physicochemical properties of the resulted materials were studied by X-ray diffraction, XPS, scanning (SEM) and transmission (TEM) electron microscopy. The nature of the silicon species was identified by 29Si NMR method and the acidity was measured by IR-spectroscopy of adsorbed pyridine. The activity and selectivity of Pd modified SAPO-31 samples from both series were evaluated in the isomerization of n-decane. It was found that the use of the monomer as a silicon source ensured more efficient silicon incorporation, which resulted in the higher activity of Pd/SAPO-31 catalysts. Moreover, the selectivity of these samples for isomerization was found to be independent of the silicon content and its distribution.

Original languageEnglish
Pages (from-to)231-240
Number of pages10
JournalRussian Chemical Bulletin
Volume66
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • fumed silica
  • isomerization
  • mechanism of silicon incorporation
  • microporous silicoaluminophosphates
  • n-decane
  • tetraethoxysilane
  • CRYSTALLIZATION
  • SILICOALUMINOPHOSPHATES
  • ISOMERIZATION
  • HYDROISOMERIZATION
  • MOLECULAR-SIEVES
  • N-OCTANE
  • ACIDIC PROPERTIES
  • 1-BUTENE
  • SI
  • PARAFFINS

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