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Furfural Hydroconversion over Defective Pd/CeO2 Catalysts: More Oxygen Vacancies, Better Catalysis?
Enxian Yuan1, Yuncong Deng1, Chan Wu2
1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
Inorganic Chemistry
|August 11, 2025
Summary
Optimizing oxygen vacancies in palladium on ceria catalysts enhances furfural hydroconversion. This study reveals a volcano-type relationship, with Pd/CeO2-100 showing superior performance for sustainable chemical production.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Controllable regulation of defect engineering is crucial for understanding oxygen vacancies in catalytic reactions.
- Palladium on ceria (Pd/CeO2) is a promising catalyst system.
Purpose of the Study:
- To systematically explore the role of oxygen vacancies in Pd/CeO2 catalysts for furfural hydroconversion.
- To establish a controllable method for tuning oxygen vacancy concentration.
- To reveal the structure-activity relationship between oxygen vacancies and catalytic performance.
Main Methods:
- Preparation of Pd/CeO2-T catalysts via electrostatic adsorption.
- Modulation of oxygen vacancy properties by altering reduction temperature (T).
- Atomic-level stabilization of palladium.
- Analysis of catalytic activity for furfural hydroconversion.
Main Results:
- A volcano-type relationship between oxygen vacancy concentration and catalytic activity was observed.
- Optimal catalytic activity was achieved at a reduction temperature of 100 °C (Pd/CeO2-100).
- Pd/CeO2-100 exhibited >99% furfural conversion and 87% cyclopentanone selectivity.
- Excess oxygen vacancies at higher reduction temperatures led to surface reconstruction and decreased activity.
Conclusions:
- Oxygen vacancies play a critical role in the catalytic activity of Pd/CeO2 for furfural hydroconversion.
- Tuning oxygen vacancy concentration through reduction temperature is an effective strategy for catalyst design.
- This work provides fundamental insights into surface defect chemistry for developing advanced catalysts.
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