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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Support effects in iridium-catalyzed aerobic oxidation of benzyl alcohol studied by modulation-excitation attenuated total reflection IR spectroscopy
Authors: Ito, Shizuka
Wang, Xianwei
Waheed, Ammara
Li, Gao
Maeda, Nobutaka
Meier, Daniel Matthias
Naito, Shuichi
Baiker, Alfons
et. al: No
DOI: 10.1016/j.jcat.2020.11.010
Published in: Journal of Catalysis
Volume(Issue): 393
Pages: 42
Pages to: 50
Issue Date: 2020
Publisher / Ed. Institution: Elsevier
ISSN: 0021-9517
Language: English
Subjects: Aerobic oxidation; Benzyl alcohol; Iridium catalysts; ATR-IR spectroscopy; Modulation excitation spectroscopy; Effect of support; Al2O3; CeO2; Transient alkoxide; TiO2 overlayer
Subject (DDC): 540: Chemistry
Abstract: The influence of the support (Al2O3, CeO2, TiO2) in the oxidation of benzyl alcohol (BA) to benzaldehyde on Ir-based catalysts was investigated by ATR-IR spectroscopy in tandem with modulation excitation spectroscopy (ATR-IR-MES) at working conditions of the catalysts. ATR-IR-MES unveiled the dissociative adsorption of BA and the formation of adsorbed transient alkoxy species (C6H5CH2O-) to be key for high catalytic performance. These species were detected on Ir/TiO2 and Ir/Al2O3 but not on Ir/CeO2, which exhibited poor catalytic performance. On Ir/TiO2 pretreated with hydrogen at 450°C about 84% of the Ir sites were blocked due to formation of a titania overlayer. However, this catalyst afforded a more than seven times higher activity than the corresponding one pretreated at 300°C, where about 68% of the Ir sites were blocked. The high activity of the titania overlayer is attributed to the formation of Ti cations with oxygen vacancies caused by the hydrogen pretreatment.
Fulltext version: Accepted version
License (according to publishing contract): CC BY-NC-ND 4.0: Attribution - Non commercial - No derivatives 4.0 International
Restricted until: 2022-11-23
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Appears in collections:Publikationen School of Engineering

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