Comprehensive IR study on acid/base properties of metal oxides

Masazumi Tamura, Ken Ichi Shimizu, Atsushi Satsuma

Research output: Contribution to journalArticle

157 Citations (Scopus)

Abstract

Acid/base properties (type, strength, number) of a wide range of metal oxides were studied by IR (infra-red) spectroscopy. Ammonia, pyridine and CD 3 CN were used as probe molecules for acidity measurement. CO 2 , CHCl 3 , benzaldehyde and nitrobenzene were used for basicity measurement. Pyridine for the nature and number of acid sites, CD 3 CN for the strength of acid sites, CHCl 3 for the strength of basic sites and nitrobenzene for the number of basic sites were found to be suitable probes. The absorption coefficients of pyridine for acidic sites and nitrobenzene for basic sites, estimated for various metal oxides by IR coupled with mass spectrometry, were within ±10% of the average value, which indicates that the integrated molar extinction coefficients could be used for semi-quantification of acid/base sites of various oxides samples. The comprehensive IR results in this study will be available to characterize properties of Lewis and Bronsted acid sites and basic sites on metal oxides by a simple IR experiment.

Original languageEnglish
Pages (from-to)135-145
Number of pages11
JournalApplied Catalysis A: General
Volume433-434
DOIs
Publication statusPublished - 2012 Aug 8
Externally publishedYes

Keywords

  • Characterization
  • Heterogeneous catalysis
  • IR
  • Metal oxides
  • Solid acid
  • Solid base

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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