Wilkinson-type catalysts in ionic liquids for hydrogenation of small alkenes: understanding and improving catalyst stability

Kratzer E, Schötz S, Maisel S, Blaumeiser D, Khan Antara S, Ewald L, Dotzel D, Haumann M, Görling A, Korth W, Jess A, Retzer T (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Catalysis: Science and Technology Royal Society of Chemistry

Book Volume: 13

Pages Range: 2053-2069

DOI: 10.1039/d2cy02058k

Abstract

In this work, we apply supported ionic liquid phase (SILP) catalysts to hydrogenate 1-alkenes in a continuous fixed-bed reactor. SILP catalyts were prepared using the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C4C1Im][NTf2] and tris(triphenylphosphine)rhodium(i) chloride [RhCl(PPh3)3] as a dissolved catalyst. Under isothermal conditions, we observe an increase in activity related to restructuring of the catalyst via formation of supported metal nanoparticles (NPs). Combined in situ infrared spectroscopic and theoretical studies show that NP formation is a step-wise process including the sequential loss of ligands and formation of isolated, supported Rh+-ions as intermediates. To stabilize the highly selective homogeneous catalyst, we systematically vary the experimental conditions (co-feeding of CO) and catalyst design (application of strongly binding CO or chelating xantphos ligand). This knowledge-driven approach results in a stabilization of the molecular Rh complex under hydrogenation conditions.

Authors with CRIS profile

Simon Schötz Lehrstuhl für Katalytische Grenzflächenforschung Sven Maisel Lehrstuhl für Theoretische Chemie Dominik Blaumeiser Lehrstuhl für Physikalische Chemie II Sharmin Khan Antara Lehrstuhl für Chemische Reaktionstechnik Leon Ewald Lehrstuhl für Chemische Reaktionstechnik Marco Haumann Lehrstuhl für Chemische Reaktionstechnik Andreas Görling Lehrstuhl für Theoretische Chemie Tanja Retzer Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

Universität Bayreuth DE Germany (DE)

How to cite

APA:

Kratzer, E., Schötz, S., Maisel, S., Blaumeiser, D., Khan Antara, S., Ewald, L.,... Retzer, T. (2023). Wilkinson-type catalysts in ionic liquids for hydrogenation of small alkenes: understanding and improving catalyst stability. Catalysis: Science and Technology, 13, 2053-2069. https://doi.org/10.1039/d2cy02058k

MLA:

Kratzer, Eva, et al. "Wilkinson-type catalysts in ionic liquids for hydrogenation of small alkenes: understanding and improving catalyst stability." Catalysis: Science and Technology 13 (2023): 2053-2069.

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