Indole HDN Using Iridium Nanoparticles Supported on Titanium Nanotubes

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–TiO 2 and commercial NiMo/Al 2 O 3 catalysts. The catalysts prepared were c...

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Bibliographic Details
Published in:Catalysis letters 2023-10, Vol.153 (10), p.3111-3121
Main Authors: Ledesma, Brenda C., Martínez, María L., Gómez Costa, Marcos Bruno, Beltramone, Andrea R.
Format: Article
Language:English
Subjects:
Adsorption
Aluminum oxide
Analysis
Carbon
Catalysis
Catalysts
Chemisorption
Chemistry
Chemistry and Materials Science
Crystallites
Diffraction
Hydrogenation
Hydrogenolysis
Industrial Chemistry/Chemical Engineering
Iridium
Isotherms
Metals
Nanoparticles
Nanotubes
Organometallic Chemistry
Physical Chemistry
Reproducibility
Spectrum analysis
Titanium
Titanium dioxide
X-ray diffraction
X-rays
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Summary: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–TiO 2 and commercial NiMo/Al 2 O 3 catalysts. The catalysts prepared were characterized by X-ray diffraction (XRD), N 2 adsorption isotherms, UV–Vis-DRS, FTIR, XPS, TEM, Py-FTIR and H 2 -Chemisorption. XRD, N 2 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 TiO 2 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. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-022-04221-x