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Tunable Solid Acid Catalyst Thin Films Prepared by Atomic Layer Deposition.

Christian P Canlas1, Lei Cheng2, Brandon O'Neill3

  • 1Applied Materials Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States.

ACS Applied Materials & Interfaces
|September 29, 2022
PubMed
Summary
This summary is machine-generated.

Atomic layer deposition (ALD) enables precise tuning of Brønsted and Lewis acid sites in solid acid catalysts. This advancement offers new possibilities for biomass conversion, overcoming limitations of traditional zeolites and amorphous silica-aluminas.

Keywords:
Brønsted acidamorphous silica-aluminaatomic layer depositioncatalystdensity functional theoryin situ measurement

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Solid acid catalysts like zeolites and amorphous silica-aluminas (ASAs) are crucial in fuel and petrochemical industries.
  • Zeolites offer tunable Brønsted acidity and shape selectivity, but their small pores limit biomass conversion applications.
  • Tailoring acidity in ASAs is challenging due to debated Brønsted acid structures, and pore size and acidity are often interdependent.

Purpose of the Study:

  • To develop a novel method for synthesizing solid acid catalysts with tunable Brønsted to Lewis acid site ratios.
  • To achieve sub-nanometer pore size control for enhanced catalytic performance, particularly in biomass conversion.
  • To investigate the structure of Brønsted acid sites in the synthesized materials and its potential relevance to conventional ASAs.

Main Methods:

  • Utilizing atomic layer deposition (ALD) to create thin films of solid acid materials.
  • Precisely controlling the ratio of Brønsted to Lewis acid sites during ALD.
  • Characterizing the synthesized catalysts using infrared spectroscopy, solid-state nuclear magnetic resonance, and density functional theory calculations.

Main Results:

  • Demonstrated precise tunability of Brønsted to Lewis acid site ratios in solid acid catalysts.
  • Achieved sub-nanometer pore size control, enabling application in biomass conversion reactions.
  • Successfully applied the synthesized catalysts in the Meerwein-Ponndorf-Verley-Oppenauer (MPVO) reaction, fructose dehydration, and glucose to 5-hydroxymethylfurfural conversion.
  • Proposed a plausible structure for Brønsted acid sites, potentially applicable to conventional ASAs.

Conclusions:

  • ALD provides a flexible platform for designing solid acid catalysts with tailored acidity and pore size.
  • These novel catalysts show significant promise for efficient biomass conversion.
  • The findings offer insights into the fundamental structure of acid sites in amorphous silica-aluminas.