Monitoring Catalytic 2-Propanol Oxidation over Co 3 O 4 Nanowires via In Situ Photoluminescence Spectroscopy.

Autor:	Klein J; Werkstoffe der Elektrotechnik and CENIDE, Universität Duisburg-Essen, Bismarckstraße 81, 47057 Duisburg, Germany., Kampermann L; Werkstoffe der Elektrotechnik and CENIDE, Universität Duisburg-Essen, Bismarckstraße 81, 47057 Duisburg, Germany., Korte J; Werkstoffe der Elektrotechnik and CENIDE, Universität Duisburg-Essen, Bismarckstraße 81, 47057 Duisburg, Germany., Dreyer M; Faculty for Chemistry, Inorganic Chemistry and CENIDE, Universität Duisburg-Essen, 45141 Essen, Germany., Budiyanto E; Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany., Tüysüz H; Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, 45470 Mülheim an der Ruhr, Germany., Ortega KF; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany., Behrens M; Faculty for Chemistry, Inorganic Chemistry and CENIDE, Universität Duisburg-Essen, 45141 Essen, Germany.; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany., Bacher G; Werkstoffe der Elektrotechnik and CENIDE, Universität Duisburg-Essen, Bismarckstraße 81, 47057 Duisburg, Germany.
Jazyk:	angličtina
Zdroj:	The journal of physical chemistry letters [J Phys Chem Lett] 2022 Apr 14; Vol. 13 (14), pp. 3217-3223. Date of Electronic Publication: 2022 Apr 04.
DOI:	10.1021/acs.jpclett.2c00098
Abstrakt:	Spectroscopic methods enabling real-time monitoring of dynamic surface processes are a prerequisite for identifying how a catalyst triggers a chemical reaction. We present an in situ photoluminescence spectroscopy approach for probing the thermocatalytic 2-propanol oxidation over mesostructured Co 3 O 4 nanowires. Under oxidative conditions, a distinct blue emission at ∼420 nm is detected that increases with temperature up to 280 °C, with an intermediate maximum at 150 °C. Catalytic data gained under comparable conditions show that this course of photoluminescence intensity precisely follows the conversion of 2-propanol and the production of acetone. The blue emission is assigned to the radiative recombination of unbound acetone molecules, the n ↔ π* transition of which is selectively excited by a wavelength of 270 nm. These findings open a pathway for studying thermocatalytic processes via in situ photoluminescence spectroscopy, thereby gaining information about the performance of the catalyst and the formation of intermediate products.
Databáze:	MEDLINE
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