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Issue 18, 2019
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Improving the performance of supported ionic liquid phase (SILP) catalysts for the ultra-low-temperature water–gas shift reaction using metal salt additives

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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.

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

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Publication details

The article was received on 26 Jun 2019, accepted on 14 Aug 2019 and first published on 14 Aug 2019


Article type: Paper
DOI: 10.1039/C9GC02153A
Green Chem., 2019,21, 5008-5018

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

    P. Wolf, M. Aubermann, M. Wolf, T. Bauer, D. Blaumeiser, R. Stepic, C. R. Wick, D. M. Smith, A. Smith, P. Wasserscheid, J. Libuda and M. Haumann, Green Chem., 2019, 21, 5008
    DOI: 10.1039/C9GC02153A

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