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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
Published on: August 15, 2019
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Surfactant-Mediated One-Pot Method To Prepare Pd-CeO2 Colloidal Assembled Spheres and Their Enhanced Catalytic
Chenhao Du1, Guanzhong Lu1, Yun Guo1
1Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China.
ACS Omega
|August 29, 2019
Summary
A novel one-pot method creates ordered palladium-cerium oxide (Pd-CeO2) colloidal assembled spheres (CASs) for enhanced CO oxidation catalysis. These CAS nanocatalysts show superior activity and stability compared to traditional methods.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Developing advanced catalysts is crucial for efficient chemical reactions.
- Cerium oxide (CeO2) based materials are promising for catalytic applications.
- Nanostructured catalysts offer unique properties for improved performance.
Purpose of the Study:
- To develop a simple, one-pot method for fabricating ordered, monodispersed Pd-CeO2 colloidal assembled spheres (CASs).
- To investigate the formation mechanism and catalytic performance of these CASs for CO oxidation.
- To explore the potential of this method for other metal-ceria CASs.
Main Methods:
- Surfactant-mediated solvothermal synthesis for tunable self-assembly.
- Time-controlled and component-controlled experiments to study the evolution process.
- Characterization of CASs and evaluation of their catalytic activity for CO oxidation.
Main Results:
- Successfully fabricated ordered, monodispersed Pd-CeO2 CASs.
- CAS nanocatalyst demonstrated significantly higher catalytic activity and thermal stability for CO oxidation compared to impregnation-prepared Pd/CeO2.
- Complete CO conversion was achieved at approximately 120 °C.
- Enhanced performance attributed to synergistic effects between dispersed PdO species and lattice-incorporated Pd2+.
- The method was extended to prepare other M-CeO2 CASs (M = Pt, Cu, Mn, Co).
Conclusions:
- The developed surfactant-mediated solvothermal approach is a new and ideal method for fabricating active and stable ceria-based materials.
- Pd-CeO2 CASs show excellent potential as nanocatalysts for CO oxidation.
- The CAS structure acts as a single reactor, with performance further enhanced when supported on alumina.
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