TY - JOUR
T1 - Acceptorless dehydrogenation of 4-methylpiperidine by supported pincer-ligated iridium catalysts in continuous flow
AU - Chakrabarti, Kaushik
AU - Spangenberg, Alice
AU - Subramaniyan, Vasudevan
AU - Hederstedt, Andreas
AU - Abdelaziz, Omar Y.
AU - Polukeev, Alexey V.
AU - Wallenberg, Reine
AU - Hulteberg, Christian P.
AU - Wendt, Ola F.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
U2 - 10.1039/d3cy00881a
DO - 10.1039/d3cy00881a
M3 - Article
AN - SCOPUS:85168824053
SN - 2044-4753
VL - 13
SP - 5113
EP - 5119
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 17
ER -