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Related Experiment Video

Updated: May 15, 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

Transforming ceria into 2D clusters enhances catalytic activity.

Konstantin Khivantsev¹, Hien Pham², Mark H Engelhard³

¹Pacific Northwest National Laboratory, Richland, WA, USA. Konstantin.Khivantsev@pnnl.gov.

|April 9, 2025

Summary

A new method disperses ceria nanoparticles into 2D domains on alumina, significantly boosting oxygen mobility and storage. This enhances catalytic activity for crucial reactions, even after harsh aging, creating more efficient ceria-based catalysts.

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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

Area of Science:

Catalysis
Materials Science
Surface Chemistry

Background:

Ceria nanoparticles on alumina are key in catalysis, often with platinum group metals (PGMs).
High temperatures can cause sintering, reducing catalyst effectiveness.

Purpose of the Study:

To investigate a novel treatment for ceria-alumina catalysts to enhance their structure and performance.
To understand the resulting nanostructure and its impact on redox properties and catalytic activity.

Main Methods:

Reactive treatment of ceria-alumina catalysts with CO, NO, and steam at 750-1000°C.
Characterization using microscopy, X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), infrared spectroscopy, and density functional theory (DFT) calculations.

Main Results:

Ceria nanoparticles dispersed into high-density, 2D Ce_xO_y domains covering the alumina surface.
Enhanced oxygen mobility and storage capacity in the 2D ceria domains.
Improved catalytic activity for NO and N₂O reduction and CO and NO oxidation, with or without PGMs, after harsh aging.

Conclusions:

The developed catalyst architecture exhibits superior redox properties and stability under sintering conditions.
This approach offers a pathway to highly efficient metal-ceria catalysts for general catalysis applications.