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Heterogeneous Catalysis

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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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Related Experiment Video

Updated: Jun 26, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Tuning selectivity in catalysis by controlling particle shape.

Ilkeun Lee¹, Françoise Delbecq, Ricardo Morales

¹Department of Chemistry, University of California, Riverside, California 92521, USA.

Nature Materials

|January 20, 2009

Summary

This study demonstrates a catalytic process for selective cis olefin formation, reducing unhealthy trans fats in edible oils. Controlling platinum nanoparticle shape optimizes trans-to-cis isomerization for healthier food production.

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Last Updated: Jun 26, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

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

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Published on: July 1, 2016

Area of Science:

Catalysis
Materials Science
Organic Chemistry

Background:

Partial hydrogenation of edible oils can produce unhealthy trans fats.
Selective formation of cis olefins is crucial for healthier food products.

Purpose of the Study:

To design a catalytic process for selective cis olefin formation.
To understand and control the factors influencing trans-to-cis isomerization during hydrogenation.

Main Methods:

Utilized temperature programmed desorption on platinum single crystals.
Performed quantum mechanics calculations to investigate surface interactions.
Employed kinetic studies with dispersed platinum nanoparticle catalysts.

Main Results:

Platinum (111) facets selectively promote trans-to-cis olefin isomerization.
More open platinum surfaces reverse this selectivity.
Surface reconstruction and hydrogen saturation influence cis olefin stability on Pt(111).
Tetrahedral platinum nanoparticles confirmed selective trans-to-cis isomerization on (111) facets.

Conclusions:

Catalytic selectivity can be precisely controlled by tailoring the shape of catalytic particles.
This approach offers a method to minimize trans fat production in edible oil hydrogenation.