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Related Experiment Video

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Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Quantifying Site Heterogeneity in Microporous Aluminosilicates and Implications for Catalysis.

Edgard A Lebrón-Rodríguez1, Fillipp E Salvador2, Zahra Alikhani2

  • 1Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.

ACS Catalysis
|October 23, 2025
PubMed
Summary

This study introduces a new method to quantify different types of acid sites in zeolites, crucial for catalysis. Understanding these sites improves the reliability of catalyst research and development.

Keywords:
acid site titrationalkane crackingpartially hydrolyzedrate enhancementsite heterogeneitystructure−performance relationshipswater effectszeolites

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemistry

Background:

  • Microporous materials like zeolites are vital acid catalysts in refining and biomass conversion.
  • Hydrothermal conditions create complex catalytic behaviors due to nonframework sites, affecting reproducibility.
  • Existing Brønsted and Lewis site classifications are insufficient for understanding steamed aluminosilicates.

Purpose of the Study:

  • To develop and validate characterization and titration protocols for quantifying site heterogeneity in steamed aluminosilicates.
  • To differentiate between framework, partially hydrolyzed, and extraframework sites.
  • To establish a quantitative method for site distribution analysis without catalyst modification.

Main Methods:

  • Utilized commercial MFI aluminosilicates (ZSM-5) with varying site heterogeneity and Si/Al ratios.
  • Employed temperature-programmed desorption and Fourier-transform infrared spectroscopy (FTIR) protocols.
  • Correlated quantified site distribution with propane cracking rate constants.

Main Results:

  • Developed a nuanced titration strategy to quantitatively determine aluminosilicate site heterogeneity and Al content.
  • Demonstrated the impact of water on Al coordination, even at ambient conditions, especially with higher Al content.
  • Quantified site distribution and its effect on propane cracking kinetics.

Conclusions:

  • The developed titration strategy provides an accessible method to determine site heterogeneity in dried zeolites.
  • This approach aids in evaluating structure-performance relationships for acidic zeolites.
  • Findings contribute to more reproducible and reliable catalyst research by addressing site variability.