Characterisation of acid sites in decationated zeolites: Study of NH3 sorption by frequency-response technique and FTIR spectroscopy

G. Onyestyák, D. Shen, L. V C Rees

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A novel technique is suggested for measuring and interpreting data on kinetics ofammonia adsorption-desorption processes characterising acidic sites in zeolite catalysts. The frequency-response results were compared with the bands observed in FTIR spectra of numerous zeolites studied. The frequency-response method has been shown to be capable of distinguishing the different strengths and concentrations of acid sites present in various zeolites under equilibrium sorbate pressures which are more closely related to real reaction conditions. The method, therefore, has an advantage over techniques which require high vacuum conditions or low probe molecule pressures to obtain the relevant information. Adspecies detected by frequency-response technique (FRT) surely plays a role in a dynamic system. Combination of this technique and other methods is necessary in order to reach at a complete description of zeolitic acid sites.

Original languageEnglish
Pages (from-to)116-123
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume94
Issue numberC
DOIs
Publication statusPublished - 1995

Fingerprint

Zeolites
zeolites
sorption
frequency response
Frequency response
Sorption
Spectroscopy
acids
Acids
spectroscopy
sorbates
high vacuum
Desorption
Dynamical systems
desorption
Vacuum
Adsorption
catalysts
Catalysts
Molecules

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Catalysis
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Surfaces, Coatings and Films

Cite this

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abstract = "A novel technique is suggested for measuring and interpreting data on kinetics ofammonia adsorption-desorption processes characterising acidic sites in zeolite catalysts. The frequency-response results were compared with the bands observed in FTIR spectra of numerous zeolites studied. The frequency-response method has been shown to be capable of distinguishing the different strengths and concentrations of acid sites present in various zeolites under equilibrium sorbate pressures which are more closely related to real reaction conditions. The method, therefore, has an advantage over techniques which require high vacuum conditions or low probe molecule pressures to obtain the relevant information. Adspecies detected by frequency-response technique (FRT) surely plays a role in a dynamic system. Combination of this technique and other methods is necessary in order to reach at a complete description of zeolitic acid sites.",
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AU - Rees, L. V C

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AB - A novel technique is suggested for measuring and interpreting data on kinetics ofammonia adsorption-desorption processes characterising acidic sites in zeolite catalysts. The frequency-response results were compared with the bands observed in FTIR spectra of numerous zeolites studied. The frequency-response method has been shown to be capable of distinguishing the different strengths and concentrations of acid sites present in various zeolites under equilibrium sorbate pressures which are more closely related to real reaction conditions. The method, therefore, has an advantage over techniques which require high vacuum conditions or low probe molecule pressures to obtain the relevant information. Adspecies detected by frequency-response technique (FRT) surely plays a role in a dynamic system. Combination of this technique and other methods is necessary in order to reach at a complete description of zeolitic acid sites.

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