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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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Related Experiment Video

Updated: May 20, 2026

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Published on: July 9, 2015

Polyelectrolyte-multilayer-supported Au@Ag core-shell nanoparticles with high catalytic activity.

Xin Zhang¹, Zhaohui Su

¹State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.

Advanced Materials (Deerfield Beach, Fla.)

|July 19, 2012

Summary

Gold-silver bimetallic nanoparticles synthesized in situ within polyelectrolyte multilayers exhibit enhanced catalytic activity for 4-nitrophenol reduction compared to monometallic nanoparticles.

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Polyelectrolyte multilayers (PEMs) offer a versatile platform for nanomaterial synthesis.
Bimetallic nanoparticles can exhibit synergistic catalytic properties.
Controlling nanoparticle composition and structure is key to optimizing catalytic performance.

Purpose of the Study:

To synthesize gold-silver (Au-Ag) bimetallic core-shell nanoparticles in situ within PEMs.
To investigate the catalytic activity of these bimetallic nanoparticles for 4-nitrophenol reduction.
To compare the catalytic performance of Au-Ag bimetallic nanoparticles with their monometallic counterparts (Au and Ag).

Main Methods:

In situ synthesis of Au-Ag bimetallic core-shell nanoparticles within PEMs.
Sequential ion-exchange and reduction processes were employed for nanoparticle formation.
Catalytic activity was assessed by monitoring the reduction of 4-nitrophenol using sodium borohydride (NaBH(4)).

Main Results:

Successful synthesis of Au-Ag bimetallic core-shell nanoparticles within the polyelectrolyte matrix.
Au-Ag bimetallic nanoparticles demonstrated significantly higher catalytic activity compared to pure gold (Au) and silver (Ag) nanoparticles.
The enhanced activity is attributed to the synergistic effects of the bimetallic composition.

Conclusions:

In situ synthesis in PEMs is an effective method for creating highly active Au-Ag bimetallic core-shell nanoparticles.
These bimetallic nanoparticles represent promising catalysts for chemical reduction reactions.
The findings highlight the potential of designing advanced catalytic nanomaterials using PEMs.