Detection and estimation of Bronsted acidities in alkali metal cation exchanged X and Y zeolites

K. J. Thomas, V. Ramamurthy

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

An `indicator titration' method that can identify the acidity of a zeolite is presented. This method is particularly useful when the zeolite possesses acidity that is below the detection limit of conventional techniques such as MAS NMR. However, this technique underestimates the extent of acidity of zeolites that contain a large number of acidic sites such as in CaY and HY. On the basis of this technique, the commonly available alkali metal exchanged Y zeolites are estimated to contain one acidic site per approximately 116 aluminums. In contrast to Y, the alkali metal exchanged X zeolites do not contain enough Bronsted acid sites to be detected by this technique.

Original languageEnglish (US)
Pages (from-to)6687-6692
Number of pages6
JournalLangmuir
Volume14
Issue number23
DOIs
StatePublished - Jan 1 1998
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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