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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...
Catalysis01:27

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...
Catalysis02:50

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.
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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...

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Related Experiment Video

Updated: Jun 18, 2026

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
11:16

Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

Published on: August 18, 2020

Heterogenous catalysis mediated by plasmon heating.

James R Adleman1, David A Boyd, David G Goodwin

  • 1Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA.

Nano Letters
|November 14, 2009
PubMed
Summary

We developed plasmon-assisted catalysis, a novel method using lasers to heat nanoscale metal catalysts for chemical reactions. This technique enables efficient, low-temperature heterogeneous catalysis in microfluidic systems.

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Last Updated: Jun 18, 2026

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Area of Science:

  • Nanotechnology
  • Chemical Engineering
  • Materials Science

Background:

  • Heterogeneous catalysis often requires high temperatures, increasing energy demands.
  • Nanoparticles offer high surface area for catalytic reactions but can suffer from thermal management challenges.

Purpose of the Study:

  • To introduce a novel method for performing heterogeneous catalysis using plasmon resonance in nanoparticles.
  • To demonstrate a miniaturized catalytic system operating at low temperatures.

Main Methods:

  • Utilizing plasmon resonance of nanoscale metal catalysts (gold nanoparticles) under low-power laser illumination.
  • Performing steam reforming of ethanol and water in a microfluidic channel over the nanoparticle catalysts.

Main Results:

  • Plasmon heating provided the necessary heat for the endothermic reaction.
  • Local generation of water and ethanol vapor occurred over the catalysts.
  • The system operated with the chip and fluid lines remaining at room temperature.
  • Products (CO2, CO, H2) indicated successful catalytic steam reforming of ethanol.

Conclusions:

  • Plasmon-assisted catalysis is a viable and general method for miniaturizing heterogeneous catalytic processes.
  • The technique efficiently utilizes light energy for catalytic heat generation.
  • Applicable to various endothermic catalytic reactions involving nanoparticles.