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Cluster Density-Dependent Electronic Metal-Support Interactions in Rh/CeO2 for Enhanced Styrene Hydroformylation
Xin Zhou1, Jiyun Ren1, Weixiao Xu1
1School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Controlling rhodium (Rh) cluster density on ceria (CeO2) nanorods tunes electronic properties and enhances catalytic performance. Lower cluster density improves electron richness, boosting styrene hydroformylation efficiency.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Electronic metal-support interactions (EMSI) are crucial for supported noble metal catalyst performance.
- Conventional strategies focus on metal size and support properties, neglecting metal cluster density's role.
Purpose of the Study:
- To investigate the impact of rhodium (Rh) cluster density on CeO2 nanorods (NR-CeO2) and its influence on EMSI.
- To establish a relationship between Rh cluster density and electronic properties for catalytic optimization.
Main Methods:
- Synthesis of Rh clusters with controlled density on NR-CeO2.
- Characterization of interfacial charge transfer and electronic structure.
- Evaluation of catalytic activity for styrene hydroformylation.
Main Results:
- Precise control over Rh cluster density on NR-CeO2 was achieved.
- A negative correlation was found between Rh cluster density and electron richness.
- Low-density Rh clusters showed enhanced electron donation from NR-CeO2, shifting the Rh d-band center upwards.
Conclusions:
- Cluster density engineering is a novel strategy to tune EMSI in supported catalysts.
- Optimizing Rh cluster density on NR-CeO2 significantly enhances catalytic performance, achieving a TOF of 603 h-1 for styrene hydroformylation.
- This approach complements traditional size- and support-focused strategies for catalyst development.
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