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

Wolf, Patrick; Aubermann, Manfred; Wolf, Moritz; Bauer, Tanja; Blaumeiser, Dominik; Stepic, Robert; Wick, Christian R.; Smith, David M.; Smith, Ana-Sunčana; Wasserscheid, Peter; Libuda, Joerg; Haumann, Marco (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). pp. 5008-5018. ISSN 1463-9262

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Official URL: https://pubs.rsc.org/--/content/articlehtml/2019/g...

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 degrees 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.

Item Type:

Article

Uncontrolled Keywords:

carbon-monoxide ; room-temperature ; reversible-reaction ; coupling reactions ; fused-salts ; absorption ; CO ; approximation ; solubility ; complexes

Subjects:

NATURAL SCIENCES
NATURAL SCIENCES > Chemistry

Divisions:

Division of Physical Chemistry

Projects:

Project title	Project leader	Project code	Project type
European Commission within the Horizon 2020-SPIRE project ROMEO 680395	UNSPECIFIED	680395	Horizon 2020-SPIRE
DFG from the Excellence Cluster "Engineering of Advanced Materials" Free State of Bavaria	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED

Depositing User:

Ana Sunčana Smith

Date Deposited:

09 Dec 2020 14:33

URI:

http://fulir.irb.hr/id/eprint/6062

DOI:

10.1039/c9gc02153a