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

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...

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Bibliographic Details
Published in:Catalysis letters 2014-05, Vol.144 (5), p.783-795
Main Authors: Ledesma, Brenda C., Vallés, Verónica A., Rivoira, Lorena P., Martínez, María L., Anunziata, Oscar A., Beltramone, Andrea R.
Format: Article
Language:English
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
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Summary: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
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-014-1222-8