Pd Single-Atom Loaded Ce-Zr Solid Solution Catalysts Prepared by Flame Spray Pyrolysis for Efficient CO Catalytic...

Area of Science:

• Materials Science
• Catalysis
• Chemical Engineering

Background:

• Single-atom catalysts (SACs) offer high atom efficiency but are often limited by low metal loading.
• Conventional synthesis methods struggle to achieve high metal content in SACs, hindering their practical application.
• Developing scalable methods for high-loading SACs is crucial for improving catalytic performance.

Purpose of the Study:

• To develop a flame spray pyrolysis (FSP) method for synthesizing single-atom catalysts (SACs) with high metal loading.
• To investigate the effect of high metal loading on the catalytic performance of SACs.
• To explore the use of CeZrO2 as a support material for high-density single-atom generation.

Main Methods:

• Synthesis of Pd-CeZrO2 catalysts using flame spray pyrolysis (FSP).
• Characterization of catalyst structure, metal loading, and metal-support interaction.
• Evaluation of catalytic activity for CO oxidation.

Main Results:

• Achieved a high practical metal loading of up to 1.4 wt.% for single-atom catalysts.
• CeZrO2 support provided abundant anchoring sites, promoting high-density Pd generation and preventing aggregation.
• Pd-CeZrO2 catalysts demonstrated excellent CO oxidation performance, with optimal activity at 0.97 wt.% Pd, enabling operation at 120 °C.

Conclusions:

• Flame spray pyrolysis (FSP) is a scalable technique for producing high-loading single-atom catalysts (SACs).
• High metal loading achieved via FSP significantly enhances catalytic performance, exemplified by improved CO oxidation.
• This method offers a versatile approach for preparing advanced SACs with tailored properties.