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Heterogeneous Catalysis

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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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...

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Catalysis

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Related Experiment Video

Updated: Jun 2, 2026

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method

Published on: January 9, 2012

Nanocrystal bilayer for tandem catalysis.

Yusuke Yamada¹, Chia-Kuang Tsung, Wenyu Huang

¹Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, USA.

Nature Chemistry

|April 21, 2011

Summary

Researchers developed novel nanocrystal tandem catalysts with multiple metal-oxide interfaces. These catalysts efficiently convert methanol and ethylene into propanal through sequential reactions, showcasing a new design for high-performance nanostructured catalysts.

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Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Supported catalysts are crucial in industry, with performance linked to metal-oxide interfaces.
Optimizing nanostructured catalysts requires rational design of these interfaces for enhanced activity and selectivity.

Purpose of the Study:

To introduce a new class of nanocrystal tandem catalysts with multiple metal-oxide interfaces.
To demonstrate the catalytic capability of these tandem catalysts for sequential reactions.

Main Methods:

Fabrication of nanocrystal bilayer structures using platinum and cerium oxide nanocube monolayers (<10 nm) on a silica substrate.
Utilizing distinct CeO(2)-Pt and Pt-SiO(2) interfaces for sequential catalytic steps.

Main Results:

The CeO(2)-Pt interface effectively decomposed methanol into CO and H(2).
The Pt-SiO(2) interface subsequently catalyzed ethylene hydroformylation using the products from the first step.
Selective production of propanal from methanol and ethylene was achieved using the tandem catalyst.

Conclusions:

A novel concept of nanocrystal tandem catalysis was successfully demonstrated.
This approach enables the design of multifunctional nanostructured catalysts for complex sequential reactions.
The developed catalysts offer a powerful strategy for high-performance catalytic applications.