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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...

Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

Catalysis

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

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Related Experiment Video

Updated: May 21, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Gas phase metal cluster model systems for heterogeneous catalysis.

Sandra M Lang¹, Thorsten M Bernhardt

¹University of Ulm, Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, 89069 Ulm, Germany.

Physical Chemistry Chemical Physics : PCCP

|June 7, 2012

Summary

Gas phase metal clusters offer molecular insights into catalysis. Studying these model systems reveals surprising catalytic activity, especially for gold nanoparticles, guiding future material development.

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Area of Science:

Physical Chemistry
Catalysis
Materials Science

Background:

Intense cluster sources enable research into isolated metal cluster properties.
Gas phase metal clusters serve as ideal model systems for studying metal-mediated reactions at a molecular level.
Nanoscale gold particles exhibit surprising catalytic activity, prompting further investigation.

Purpose of the Study:

To summarize experimental reactivity studies on small gas phase metal clusters.
To investigate thermal catalytic reaction cycles using these model systems.
To provide conceptual insights into catalysis based on gas phase studies.

Main Methods:

Experimental reactivity studies on isolated metal clusters.
Investigations of thermal catalytic reaction cycles.
Analysis of gas phase model systems to understand catalytic mechanisms.

Main Results:

Demonstrated the importance of gas phase model systems for understanding catalytic energetics and kinetics.
Highlighted the significant catalytic activity of nanoscale gold particles.
Provided conceptual insights applicable to broader catalytic processes.

Conclusions:

Gas phase cluster studies offer fundamental understanding of catalysis.
Future catalytic materials can be optimized using insights from bimetals and metal oxides.
Bio-inspired catalytic systems and technical advancements hold future potential.