Improving the performance of supported ionic liquid phase (SILP) catalysts for the ultra-low-temperature water-gas shift reaction using metal salt additives

Wolf P, Aubermann M, Wolf M, Bauer T, Blaumeiser D, Stepic R, Wick C, Smith DM, Smith AS, Wasserscheid P, Libuda J, Haumann M (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Green Chemistry Royal Society of Chemistry

Book Volume: 21

Pages Range: 5008-5018

Journal Issue: 18

DOI: 10.1039/c9gc02153a

Abstract

Supported ionic liquid phase (SILP) catalyst systems containing homogeneous Ru complexes dissolved in ionic liquids (ILs) catalyze the water-gas shift reaction (WGSR) at very low temperatures, i.e., between 120 and 160 °C. One limiting factor of the SILP WGS technology is the low solubility of CO in most ILs. To overcome this issue, we study the influence of different transition metal chloride additives on the activity of Ru-based WGS SILP catalysts. CuCl as the additive was found to enhance the activity by almost 30%. This increase in activity peaks at a CuCl addition of 4 M as a result of the interplay between the increasing CO uptake in the ionic liquid film as evidenced by means of CO sorption and thermogravimetry, and the increasing, unfavorable ionic liquid acidity at too high CuCl concentrations. The respective chlorocuprate species were identified by means of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) in combination with density functional theory (DFT) calculations. We attribute the enhanced catalytic performance to cuprate ions that act as CO shuttles within the ionic liquid film.

Authors with CRIS profile

Patrick Wolf Lehrstuhl für Chemische Reaktionstechnik Manfred Aubermann Lehrstuhl für Chemische Reaktionstechnik Moritz Wolf Lehrstuhl für Chemische Reaktionstechnik Tanja Retzer Lehrstuhl für Katalytische Grenzflächenforschung Dominik Blaumeiser Lehrstuhl für Katalytische Grenzflächenforschung Robert Stepic Physics Underlying Life Science Christian Wick Physics Underlying Life Science Ana-Suncana Smith Physics Underlying Life Science Peter Wasserscheid Lehrstuhl für Chemische Reaktionstechnik Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung Marco Haumann Lehrstuhl für Chemische Reaktionstechnik

Involved external institutions

Rudjer Boskovic Institute (RBI) / Institut Ruđer Bošković (IRB) HR Croatia (HR)

How to cite

APA:

Wolf, P., Aubermann, M., Wolf, M., Bauer, T., Blaumeiser, D., Stepic, R.,... Haumann, M. (2019). Improving the performance of supported ionic liquid phase (SILP) catalysts for the ultra-low-temperature water-gas shift reaction using metal salt additives. Green Chemistry, 21(18), 5008-5018. https://doi.org/10.1039/c9gc02153a

MLA:

Wolf, Patrick, et al. "Improving the performance of supported ionic liquid phase (SILP) catalysts for the ultra-low-temperature water-gas shift reaction using metal salt additives." Green Chemistry 21.18 (2019): 5008-5018.

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