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PAMAM Dendrimer-Derived Ir/Al2O3 Catalysts: An EXAFS Characterization

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Abstract

Extended X-ray absorption fine structure (EXAFS) spectroscopy was used to characterize several synthesis stages of hydroxyl-terminated generation four (G4OH) PAMAM dendrimer-derived Ir/γ-Al2O3 catalyst. The EXAFS results indicate that Ir3+ forms complexes with dendrimer functional groups through displacement of two Cl− ion ligands. These complexes are very stable in solution, and no reduction of Ir3+ to Ir nanoparticles or clusters is observed after introduction of reducing agents such as NaBH4 or H2. These Ir3+-dendrimer complexes remain essentially intact after support impregnation. The formation of 1–2 nm particles occurs when the catalysts are treated with O2/H2 or H2, and the dendrimer-derived catalysts exhibit a lower degree of metal support interaction.

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Acknowledgments

We thankfully acknowledge the National Science Foundation (NSF NIRT Award CTS-0103135), Alfred P. Sloan Foundation Program from National Action Council for Minorities in Engineering (NACME), Inc., and Southeastern Alliance for Graduate Education and the Professoriate (SEAGEP) for their financial support. In addition, we thank to the Stanford Synchrotron Light Source (SSRL), a national user facility operated by Stanford University in California on behalf of the U.S. Department of Energy for access to perform EXAFS.

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  1. Department of Chemical Engineering, Swearingen Engineering Center, University of South Carolina, Columbia, SC, 29208, USA

    Yaritza M. López-De Jesús & Christopher T. Williams

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  1. Yaritza M. López-De Jesús
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  2. Christopher T. Williams
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Correspondence to Christopher T. Williams.

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López-De Jesús, Y.M., Williams, C.T. PAMAM Dendrimer-Derived Ir/Al2O3 Catalysts: An EXAFS Characterization. Catal Lett 132, 430–437 (2009). https://doi.org/10.1007/s10562-009-0145-2

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  • DOI: https://doi.org/10.1007/s10562-009-0145-2

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