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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Updated: May 16, 2026

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

Published on: June 16, 2014

Shape-selective sieving layers on an oxide catalyst surface.

Christian P Canlas1, Junling Lu, Natalie A Ray

  • 1Center for Catalysis and Surface Science, Northwestern University, Evanston, Illinois 60208, USA.

Nature Chemistry
|November 24, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to enhance non-porous oxide catalysts, creating reactant selectivity using sacrificial templates and atomic layer deposition for improved chemical reactions.

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Published on: February 11, 2020

Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Porous materials like zeolites and metal-organic frameworks are vital for catalysis and separations.
  • Diffusion limitations and synthesis challenges hinder the application of some porous catalysts.
  • Non-porous oxide catalysts lack inherent reactant selectivity.

Purpose of the Study:

  • To develop a novel method for imparting reactant selectivity to non-porous oxide catalysts.
  • To create precisely controlled nanostructures on catalyst surfaces.
  • To improve selectivity in competitive catalytic reactions.

Main Methods:

  • Grafting non-porous oxide catalyst particles with single-molecule sacrificial templates.
  • Partially overcoating catalysts with a second oxide using atomic layer deposition (ALD).
  • Creating thin aluminum oxide (Al2O3) sieving layers with nanocavities on titanium dioxide (TiO2) photocatalysts.

Main Results:

  • Successfully created Al2O3 sieving layers (0.4-0.7 nm thickness) with sub-2 nm nanocavities.
  • Achieved significant reactant selectivity (up to 9:1) in photocatalytic oxidations and transfer hydrogenations.
  • Demonstrated enhanced selectivity towards less sterically hindered reactants.

Conclusions:

  • The novel templating and ALD overcoating approach effectively introduces reactant selectivity to non-porous catalysts.
  • This method offers a versatile strategy for designing advanced catalytic materials with tailored properties.
  • The developed nanocavity sieving layers enhance performance in challenging chemical transformations.