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

Research output: Contribution to journalArticle

26 Citations (Scopus)

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

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Alkali Metals
Zeolites
Alkali metals
Acidity
acidity
zeolites
alkali metals
Cations
Positive ions
cations
Titration
titration
Nuclear magnetic resonance
nuclear magnetic resonance
acids
Acids

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Detection and estimation of Bronsted acidities in alkali metal cation exchanged X and Y zeolites. / Thomas, K. J.; Ramamurthy, Vaidhyanathan.

In: Langmuir, Vol. 14, No. 23, 01.11.1998, p. 6687-6692.

Research output: Contribution to journalArticle

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