HDN of Indole over Ir-modified Ti-SBA-15

BRENDA LEDESMA; OSCAR ANUNZIATA; ANDREA BELTRAMONE

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 192 p. 220 - 233

0926-3373

The hydrodenitrogenation of indole has been studied over a series of Ti-modified SBA-15supports and their respective Ir-catalysts. Ti-SBA-15 was synthesized using sol-gel methodand Ti was added during the synthesis using Tetraethyl Orthotitanate. Iridium was added bywetness impregnation. The acidity of Ti-SBA-15 was modified adding F or Al in order toimprove the catalytic activity. The catalysts prepared were extensively characterized by X-ray diffraction (XRD), N2 adsorption isotherms, UV-Vis-DRS, Raman spectroscopy, 27Al-MASNMR spectroscopy, XPS, TEM-EDS, Py-FTIR and TPR. UV-Vis-DRS and Raman spectroscopy confirmed that Ti was incorporated in tetrahedral coordination in the framework of the SBA-15. The analysis showed that the mesoporous structure was maintained after F or Al incorporation. 27Al-MAS-NMR spectroscopy indicated that aluminum was incorporated mainly in Td positions. The results showed that Ti incorporation helps to reduce significantly the size of iridium clusters and improves its dispersion considerably. Ir/Ti-SBA-15 modified with Al, with Bronsted acidity, was the most active catalyst for indole HDN, in mild conditions in a Batch reactor. The experimental data for indole hydrodenitrogenation was quantitatively represented by a Langmuir?Hinshelwood type rate equation.