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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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Updated: Mar 22, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

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Published on: April 27, 2018

Sintering-resistant Pt@CeO2 nanoparticles for high-temperature oxidation catalysis.

Siwon Lee¹, Jongsu Seo, WooChul Jung

¹Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea. wcjung@kaist.ac.kr.

|April 29, 2016

Summary

This summary is machine-generated.

We developed a novel composite catalyst with platinum nanoparticles coated in cerium dioxide shells. This design significantly enhances thermal stability and methane combustion efficiency, overcoming key limitations for industrial applications.

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Area of Science:

Materials Science
Catalysis
Nanotechnology

Background:

Nano-sized metal catalysts suffer from poor thermal stability and performance degradation, limiting industrial use.
Developing sintering-resistant catalysts is crucial for high-temperature applications.

Purpose of the Study:

To design and synthesize a post-encapsulated composite catalyst with enhanced thermal stability and reactivity.
To investigate the effect of cerium dioxide shell thickness on catalyst performance for methane combustion.

Main Methods:

Fabrication of individual platinum nanoparticles encapsulated by tunable cerium dioxide shells using a surfactant-assisted precipitation method.
Characterization of shell thickness and nanoparticle morphology.
Evaluation of thermal stability through high-temperature annealing and catalytic performance in methane combustion.

Main Results:

Uniformly coated Pt-CeO2 composite structures with controllable shell thicknesses (2.9–26.5 nm) were successfully synthesized.
Enhanced metal-support interactions prevented platinum agglomeration, maintaining isolated nanoparticles even after heating to 1000 °C.
A 13.8 nm shell thickness resulted in a >100 °C lower T10 and an eight-fold increase in methane combustion rate compared to bare catalysts.
Complete methane oxidation was sustained for over 50 hours at 700 °C.

Conclusions:

The post-encapsulation strategy effectively creates sintering-resistant nano-catalysts.
Tunable cerium dioxide shells significantly improve thermal stability and catalytic activity for methane combustion.
This approach offers a promising pathway for designing high-performance catalysts for demanding high-temperature industrial processes.