Catalysis Letters

, 141:1472 | Cite as

Acid Strength of Pt-Zeolite Catalysts: Evidence of Metal-Support Interaction from Linear Free-Energy Relationship

  • Roberta C. Tourinho
  • Igor F. de Oliveira
  • Pedro A. Arroyo
  • Claudio J. A. Mota


The acid strength of Pt-HBeta and Pt-HMordenite zeolite catalysts were estimated by H/D exchange of substituted benzenes with the use of linear free-energy relationship, through the use of the Hammet–Brown equation. The results indicated that compared with the parent acidic zeolite, the incorporation of Pt metal leads to a significant decrease in the acid strength, estimated by the slope (ρ) of the logarithm of the relative rate (k X/k H) with the σ+ constant of the substituent, indicating a lower degree of proton transfer to the ring in the transition state. The results support the model of metal-support interaction in Pt-zeolite catalyst, with formation of a metal-proton adduct.

Graphical Abstract


Zeolites Acid strength Catalysis Linear free-energy relationship 



Authors thank financial support from CNPq, FAPERJ and PRH/ANP.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Roberta C. Tourinho
    • 1
  • Igor F. de Oliveira
    • 1
  • Pedro A. Arroyo
    • 2
  • Claudio J. A. Mota
    • 1
    • 3
  1. 1.Instituto de QuímicaUniversidade Federal do Rio de JaneiroRio de JaneiroBrazil
  2. 2.Departamento Engenharia QuímicaUniversidade Estadual de MaringáMaringáBrazil
  3. 3.INCT Energia e Ambiente, UFRJRio de JaneiroBrazil

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