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https://doi.org/10.53941/mi.2025.100001
Lamkins, A., Ward, C. J., Miller, J. T., Alsudairy, Z., Li, X., Thuma, J., Cui, R., Wu, X., Stanley, L. M., & Huang, W. Size-Controlled Synthesis of Rhodium Nanocatalysts and Applications in Low-Temperature Hydroformylation. Materials and Interfaces. 2025. doi: https://doi.org/10.53941/mi.2025.100001
Volume 2, Issue 1, 2025
Copyright (c) 2025 by the authors.
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This work is licensed under a Creative Commons Attribution 4.0 International License.

Article

Size-Controlled Synthesis of Rhodium Nanocatalysts and Applications in Low-Temperature Hydroformylation

Andrew Lamkins 1,2, Charles J. Ward 1,2, Jeffrey T. Miller 3, Ziad Alsudairy 4, Xinle Li 4, Joseph Thuma 1,2, Ruoyu Cui 1,2, Xun Wu 1,2, Levi M. Stanley 1 and Wenyu Huang 1,2,*

1 Department of Chemistry, Iowa State University, Ames, IA 50010, USA

2 Ames Laboratory, U.S. Department of Energy, Ames, IA 50010, USA

3 Davidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA

4 Department of Chemistry, Clark Atlanta University, Atlanta, GA 30314, USA

* Correspondence: whuang@iastate.edu

Received: 3 December 2024; Revised: 30 December 2024; Accepted: 3 January 2025; Published: 10 January 2025

 

Abstract: Controlling the size and distribution of metal nanoparticles is one of the simplest methods of tuning the catalytic properties of a material. For a nanocrystal particle, the ratio of edge-to-terrace sites can be critical in determining its catalytic activity and selectivity to desired products. To study these effects, we have developed a simple impregnation method of controlling the dispersion of rhodium atoms at the same metal loading in the range of nanoparticles less than 10 nm. Rh precursor salts are loaded onto inert SBA-15, and increasing the ratio of chloride to acetylacetonate salts improves the dispersion of rhodium atoms to form small Rh nanoparticles. Extensive characterization of the size-controlled catalysts, including XAS and in-situ CO-DRIFTS studies, has been performed to characterize the structure of Rh nanoparticles. Applying these catalysts to the hydroformylation of styrene, we observed that turnover frequency increases with decreasing particle size from 6.4 to 1.6 nm. When applied to hydroformylation reactions, we achieved a high branched product selectivity and successfully demonstrated a route to synthesizing the pain relief drug ibuprofen. This simple method can also synthesize Pt and Pd nanoparticles between 2–10 nm.

Keywords:

heterogeneous catalysis hydroformylation EXAFS infrared spectroscopy nanoparticle

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