Hydrodenitrogenation of indole using iridium catalyst supported on titanium nanotubes

BRENDA C. LEDESMA; MARCOS B. GÓMEZ COSTA; MARIA LAURA MARTÍNEZ; ANDREA R. BELTRAMONE

Cancun

Congreso; XXX INTERNATIONAL MATERIAL RESEARCH CONGRESS; 2022

The HDN of indole was studied over iridium modified titanate nanotube catalyst. Titaniun nanotubewas 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 preparedwere characterized by X-ray diffraction (XRD), N2 adsorption isotherms, UV?Vis-DRS, 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. Theresults showed that titanate nanotube as support significantly reduce the size of iridium crystallitesand improves its dispersion considerably. Iridium titanate nanotube presented abundant and strongBronsted acidity compared with TiO2 iridium catalyst. Ir-TNT was the most active catalyst for indoleHDN, in mild conditions in a Batch reactor. The Bronsted acidity in synergic effect with Lewis acidityand hydrogenolysis capacity of iridium species were the responsible for the good activity.