Quantitative determination of acid sites on silica-alumina

Izabela Anna Stefanowicz-Pieta, M. Ishaq, Richard Wells, Jim Anderson

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Abstract

The density of acid sites on amorphous silica alumina has been determined using a combination of gravimetric and spectroscopic analysis using pyridine and 2 4-4-lutidine and 2 6-lutidine for surfaces treated at different calcination temperatures An attempt was made to correlate the number of acid sites determined by the different base molecules with the activity for liquid phase reaction of acetone to produce diacetone alcohol at 298 K The best correlation was obtained with the number of Lewis acid sites which were able to retain pyridine after evacuation at 473 K The lutidines underestimated the number of Lewis sites on the oxide surface In particular 2-6-lutidine was only able to detect Lewis acid sites in geometries at edges and other geometric imperfections on the solid and these were mainly generated after low temperature (573 K) calcination treatment (C) 2010 Elsevier 8 V All rights reserved

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalApplied Catalysis A: General
Volume390
Issue number1-2
Early online date8 Oct 2010
DOIs
Publication statusPublished - 20 Dec 2010

Keywords

  • solid acid
  • silica alumina
  • acid site determination
  • lutidines
  • pyridines
  • quantitative FTIR
  • niobium oxide catalysts
  • aldol condensation
  • active-sites
  • acetone condensation
  • surface-acidity
  • metal-oxides
  • IR characterization
  • base catalysts
  • solid acids
  • FT-IR

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