Issue 17, 2023

Acceptorless dehydrogenation of 4-methylpiperidine by supported pincer-ligated iridium catalysts in continuous flow

Abstract

Finding alternative and sustainable ways to produce, store and convert energy is key for reducing fossil fuel-based CO2 emissions. In this transformation, hydrogen for energy storage and hydrogen-powered fuel cells for energy conversion can play important roles. However, storage of hydrogen itself is difficult and the concept of reversible liquid organic hydrogen carriers (LOHCs) has been proposed given the advantages of using liquid storage materials. A key part in the adaption of LOHCs is the catalyst design for efficient dehydrogenation of these hydrogen-carrying species. In this study, the use of silica- and alumina-supported POCOP–Ir systems for gas phase acceptorless dehydrogenation of 4-methylpiperidine (an LOHC with 6.1 wt% hydrogen) is investigated in a continuous-flow system with a high TON. To increase stability and reactivity, a new POCOP–Ir complex with two anchors was designed and found to be highly active in the dehydrogenation of 4-methylpiperidine with ∼91 000 turnovers in 45 h. In addition, this catalyst showed a maintained activity with a TOF of 1684 h−1 after 45 h.

Graphical abstract: Acceptorless dehydrogenation of 4-methylpiperidine by supported pincer-ligated iridium catalysts in continuous flow

Supplementary files

Article information

Article type
Paper
Submitted
27 jún. 2023
Accepted
17 júl. 2023
First published
27 júl. 2023
This article is Open Access
Creative Commons BY license

Catal. Sci. Technol., 2023,13, 5113-5119

Acceptorless dehydrogenation of 4-methylpiperidine by supported pincer-ligated iridium catalysts in continuous flow

K. Chakrabarti, A. Spangenberg, V. Subramaniyan, A. Hederstedt, O. Y. Abdelaziz, A. V. Polukeev, R. Wallenberg, C. P. Hulteberg and O. F. Wendt, Catal. Sci. Technol., 2023, 13, 5113 DOI: 10.1039/D3CY00881A

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