Support effects in iridium-catalyzed aerobic oxidation of benzyl alcohol studied by modulation-excitation attenuated total reflection IR spectroscopy
نویسندگان
چکیده
The influence of the support (Al2O3, CeO2, TiO2) in oxidation benzyl alcohol (BA) to benzaldehyde on Ir-based catalysts was investigated by ATR-IR spectroscopy tandem with modulation excitation (ATR-IR-MES) at working conditions catalysts. ATR-IR-MES unveiled dissociative adsorption BA and formation adsorbed transient alkoxy species (C6H5CH2O) be key for high catalytic performance. These were detected Ir/TiO2 Ir/Al2O3 but not Ir/CeO2, which exhibited poor On pretreated hydrogen 450 °C about 84% Ir sites blocked due a titania overlayer. However, this catalyst afforded more than seven times higher activity corresponding one 300 °C, where 68% blocked. overlayer is attributed Ti cations oxygen vacancies caused pretreatment.
منابع مشابه
Polarized infrared absorption of Na+/K+-ATPase studied by attenuated total reflection spectroscopy.
Na+/K+-ATPase can be isolated from the outer medulla of mammalian kidney in the form of flat membrane fragments containing the enzyme in a density of 10(3)-10(4) protein molecules per microm2 (Deguchi et al. (1977) J. Cell. Biol. 75, 619-634). In this paper we show that these membrane fragments can be bound to a germanium plate coated with a phospholipid bilayer. With this system infrared spect...
متن کاملWet-Chemical Treatment of Si3N4 Surfaces Studied Using Infrared Attenuated Total Reflection Spectroscopy
Same as Report (SAR) 18. NUMBER
متن کاملHydrocarbon Chain Ordering in Liquid Crystals Investigated by Means of Infrared Attenuated Total Reflection (IR-ATR) Spectroscopy
für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...
متن کاملMechanism of copper(I)/TEMPO-catalyzed aerobic alcohol oxidation.
Homogeneous Cu/TEMPO catalyst systems (TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxyl) have emerged as some of the most versatile and practical catalysts for aerobic alcohol oxidation. Recently, we disclosed a (bpy)Cu(I)/TEMPO/NMI catalyst system (NMI = N-methylimidazole) that exhibits fast rates and high selectivities, even with unactivated aliphatic alcohols. Here, we present a mechanistic inve...
متن کاملPromoted aerobic oxidation of benzyl alcohol on CNT supported platinum by iron oxide.
The catalytic activity of Pt/CNT for benzyl alcohol aerobic oxidation was remarkably improved by decorating iron oxide on Pt nanoparticles, and electrochemical measurements evidenced the enhanced activation of oxygen and benzyl alcohol at the FeO(x)/Pt interface.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Catalysis
سال: 2021
ISSN: ['0021-9517', '1090-2694']
DOI: https://doi.org/10.1016/j.jcat.2020.11.010