Supported Liquid Catalysts

Riisager, Anders; Fehrmann, Rasmus; Wasserscheid, Peter

doi:10.1002/9783527610044.hetcat0031

Cited by 32 publications

(36 citation statements)

References 93 publications

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“…One particular interesting example is supported ionic liquid phase (SILP) catalysis. [13][14][15][16][17][18] Here, thin fi lms of ILs on high surface area supports are used to immobilize catalytically active transition metal complexes. The very low vapor pressure of nearly all aprotic ILs helps to avoid loss of solvents by evaporation during the catalytic process.…”

Section: Introductionmentioning

confidence: 99%

Surface Science and Model Catalysis with Ionic Liquid‐Modified Materials

et al. 2011

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Materials making use of thin ionic liquid (IL) films as support-modifying functional layer open up a variety of new possibilities in heterogeneous catalysis, which range from the tailoring of gas-surface interactions to the immobilization of molecularly defined reactive sites. The present report reviews recent progress towards an understanding of "supported ionic liquid phase (SILP)" and "solid catalysts with ionic liquid layer (SCILL)" materials at the microscopic level, using a surface science and model catalysis type of approach. Thin film IL systems can be prepared not only ex-situ, but also in-situ under ultrahigh vacuum (UHV) conditions using atomically well-defined surfaces as substrates, for example by physical vapor deposition (PVD). Due to their low vapor pressure, these systems can be studied in UHV using the full spectrum of surface science techniques. We discuss general strategies and considerations of this approach and exemplify the information available from complementary methods, specifically photoelectron spectroscopy and surface vibrational spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Surface Science and Model Catalysis with Ionic Liquid‐Modified Materials

et al. 2011

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“…The advantage of SILP catalysis is the reduced amount of IL needed and its multiple reuses, being economically and environmentally beneficial. The feasibility of the SILP catalysis has been demonstrated by several authors on granulated silica randomly packed [2,5] in fixed-bed reactors [6][7][8]. Moreover, most of the reactions were liquid/solid, with only few reported on the SILP catalyst applied to gasphase reactions [6,7].…”

Section: Introductionmentioning

confidence: 99%

Structured fiber supports for ionic liquid-phase catalysis used in gas-phase continuous hydrogenation

Ruta

Yuranov

Dyson

et al. 2007

Journal of Catalysis

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Structured supported ionic liquid-phase (SSILP) catalysis is a new concept with the advantages of ionic liquids (ILs) used as solvents for homogeneous catalyst and the further benefits of structured heterogeneous catalysts. This is achieved by confining the IL with the transition metal complex to the surface of a structured support consisting of sintered metal fibers (SMFs). In an attempt to improve the homogeneity of the IL film, the SMFs were coated by a layer of carbon nanofibers (CNFs). The IL thin film immobilized on CNF/SMF supports presents a high interface area, ensuring efficient use of the transition metal catalyst. The regular structure of the support with high porosity (>0.8) allows a low pressure drop and even gas-flow distribution in a fixed-bed reactor. The high thermoconductivity of the CNF/SMF support suppresses the formation of hot spots during exothermic hydrogenation reactions. The selective gas-phase hydrogenation of 1,3-cyclohexadiene to cyclohexene over a homogeneous Rh catalyst immobilized in IL supported on CNF/SMF was used as a test reaction to demonstrate the feasibility of the SSILP concept. The catalyst [Rh(H) 2 Cl(PPh 3 ) 3 /IL/CNF/SMF] showed a turnover frequency of 150-250 h −1 and a selectivity of >96%. High-pressure 1 H NMR and 1 H{ 31 P} NMR spectroscopy was used to provide insights into the nature of the active catalytic species.

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“…Ionic liquids have numerous important applications, such as solvents in organic synthesis, as stabilizers for nanoparticles, [9] and as constituents of SILP (supported ionic liquid phase) catalysts [10] and SCILL (solid catalyst with an ionic liquid layer) systems. [11] As shown in Table 1, the ILs first used in the screening affect both the activity of the catalyst Ru/Al 2 O 3 -41 (mean Ru particle size d Ru = 4.1 nm) and the cyclohexene selectivity.…”

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confidence: 99%