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Indole HDN Using Iridium Nanoparticles Supported on Titanium Nanotubes

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Abstract

The HDN of indole was studied over iridium modified titanate nanotube catalyst. Titanium nanotube was prepared by the alkaline hydrothermal method. Iridium was added by wetness impregnation. The activity was compared with Ir–TiO2 and commercial NiMo/Al2O3 catalysts. The catalysts prepared were characterized by X-ray diffraction (XRD), N2 adsorption isotherms, UV–Vis-DRS, FTIR, XPS, TEM, Py-FTIR and H2-Chemisorption. XRD, N2 isotherms and UV–vis-DRS confirmed the nanotube structure. The analysis showed that the mesoporous structure was maintained after Ir incorporation. The results showed that titanate nanotube as support significantly reduce the size of iridium crystallites and improves its dispersion considerably. Iridium titanate nanotube presented abundant and strong Brönsted acidity compared with TiO2 iridium catalyst. According a kinetic study, Ir–TNT was the most active catalyst for indole HDN, in mild conditions in a Batch reactor. The Brönsted acidity in synergic effect with Lewis acidity and hydrogenolysis capacity of iridium species were the responsible for the good activity.

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Acknowledgements

NANOTEC, CONICET, Universidad Tecnológica Nacional, Maestro López y Cruz Roja Argentina. We acknowledge the financial support provided by CONICET Argentina, PIP CONICET 11220120100218CO 2020 and FONCYT PICT-2014-1740.

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Authors and Affiliations

  1. Centro de Investigación en Nanociencia Y Nanotecnología (NANOTEC), Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López Y Cruz Roja Argentina, 5016, Córdoba, Argentina

    Brenda C. Ledesma, María L. Martínez, Marcos Bruno Gómez Costa & Andrea R. Beltramone

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  1. Brenda C. Ledesma
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  2. María L. Martínez
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  3. Marcos Bruno Gómez Costa
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  4. Andrea R. Beltramone
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Correspondence to Andrea R. Beltramone.

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Ledesma, B.C., Martínez, M.L., Gómez Costa, M.B. et al. Indole HDN Using Iridium Nanoparticles Supported on Titanium Nanotubes. Catal Lett 153, 3111–3121 (2023). https://doi.org/10.1007/s10562-022-04221-x

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