Hydrogenation of Tetralin Over Ir Catalysts Supported on Titania-Modified SBA-16

• Published in: Catalysis letters Vol. 144; no. 5; pp. 783 - 795
• Main Authors: Ledesma, Brenda C., Vallés, Verónica A., Rivoira, Lorena P., Martínez, María L., Anunziata, Oscar A., Beltramone, Andrea R.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.05.2014; Springer; Springer Nature B.V
• Subjects: Analysis; Anatase; Catalysis; Catalysts; Chemical analysis; Chemical reaction, Rate of; Chemical synthesis; Chemisorption; Chemistry; Chemistry and Materials Science; Exact sciences and technology; General and physical chemistry; Hydrogenation; Industrial Chemistry/Chemical Engineering; Iridium; Moisture content; Organic chemistry; Organometallic Chemistry; Oxidation; Petroleum products; Physical Chemistry; Quinoline; Raman spectroscopy; Sol-gel processes; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Titanium; Titanium dioxide; X ray photoelectron spectroscopy; Ti incorporation method; Iridium-containing SBA-16; Inhibition; Hydrogenation; Titanium-modified SBA-16; Reaction kinetics; Incorporation; Naphthalene(1,2,3,4-tetrahydro); Transition element compounds; Transition metal; Heterogeneous catalysis; Bicyclic compound; Titanium; Kinetics; Iridium; Titanium oxide; Platinoid; Catalyst support
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-014-1222-8

A series of Ti modified SBA-16 supports and their respective Ir-catalysts were prepared and characterized to study the effect of support preparation method on the dispersion of iridium and on the characteristics of Ir surface species. Two methods of incorporation of titania were tested: the sol–gel method in order to obtain Ti as heteroatom and incipient wetness impregnation to obtain Ti as TiO 2 (anatase phase). The results show that supports with different Ti species and dispersion can be obtained. The final catalyst was characterized at different preparation stages by XRD, elemental analysis and BET. The presence of Ti as Ti 4+ in the nanostructure of SBA and as TiO 2 (anatase phase) was analyzed by UV–Vis–DRS and Raman spectroscopy. The iridium oxidation sate upon Ti-containing SBA-16 was studied by XPS, EDX, TEM and XRD, arriving at the good proportion of Ir 0 . H 2 chemisorption and TEM characterization for Ti-SBA-16 indicated that Ir particle size was lower than anatase/SBA-16. The catalyst that we synthesized had good activity measured in tetralin hydrogenation in presence of quinoline at mild conditions. The experimental data were quantitatively represented by a modified Langmuir–Hinshelwood-type rate equation. The preliminary results show these materials as promising catalysts for HDS/HDN reactions. Graphical Abstract