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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.

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Updated: Jun 3, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

Highly Durable Rh Single Atom Catalyst Modulated by Surface Defects on Fe-Ce Oxide Solid Solution.

Gunjoo Kim¹, Seokhyun Choung², Jae-Eon Hwang¹

¹Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, South Korea.

Angewandte Chemie (International Ed. in English)

|January 8, 2025

Summary

This summary is machine-generated.

Single-atom catalysts featuring rhodium anchored on iron-ceria oxide supports show enhanced performance for selective catalytic reduction of nitrogen oxides (NOx) with carbon monoxide (CO). This durable catalyst design offers superior activity and stability.

Keywords:

durability rhodium selective catalytic reduction single atom catalyst surface defects

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Published on: April 12, 2019

Area of Science:

Materials Science
Catalysis
Surface Chemistry

Background:

Single-atom catalysts (SACs) are crucial for efficient chemical transformations.
Defect sites on catalyst supports can anchor single metal atoms for enhanced reactivity.
Iron-ceria (Fe-Ce) oxide solid solutions offer unique surface properties for catalyst design.

Purpose of the Study:

To prepare and characterize rhodium single atoms (Rh ₁) anchored on an Fe-Ce oxide support (FC).
To evaluate the performance of Rh ₁/FC in the selective catalytic reduction of nitrogen monoxide with carbon monoxide (CO-SCR).
To investigate the structural stability and reaction mechanism of the SAC under reaction conditions.

Main Methods:

Synthesis of Rh ₁/FC using defect sites on the Fe-Ce oxide support.
Characterization of the catalyst using advanced spectroscopic and theoretical methods.
Evaluation of CO-SCR activity and durability at elevated temperatures.
In situ DRIFTS and DFT calculations to study reaction intermediates and mechanisms.

Main Results:

Rh ₁/FC reduced at 500°C exhibited superior CO-SCR activity and durability compared to controls.
The single-atom structure remained stable for over 100 hours at 400°C.
DFT calculations revealed Fe sites stabilize Rh atoms, while NO and CO preferentially adsorb on Rh.
Fe facilitates oxygen transfer, enhancing catalytic performance.

Conclusions:

Fe-Ce oxide supports are effective for anchoring stable and active Rh single atoms.
Optimized reduction conditions (500°C) yield highly active and durable SACs for CO-SCR.
The synergy between Fe and Rh sites is key to the enhanced catalytic performance and stability.