Thermal Degradation of Ionic Liquids at Elevated Temperatures

Baranyai, Krisztian; Deacon, Glen B.; MacFarlane, Douglas R.; Pringle, Jennifer M.; Scott, Janet L.

doi:10.1071/ch03221

Cited by 311 publications

(239 citation statements)

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“…5e and f) for both the steels. Also the HMImPF 3 (C 2 F 5 ) 3 degraded, in accordance with the observation of Baranyai et al [8], forming a dark, thin and adherent interaction layer ( Fig. 5g and h).…”

Section: Forty-eight Hours Immersion Tests At 220 1csupporting

confidence: 72%

Ionic liquids as diathermic fluids for solar trough collectors’ technology: A corrosion study

Perissi

Bardi

Caporali

et al. 2008

Solar Energy Materials and Solar Cells

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The AISI 304 and AISI 1018 steels (frequently used in solar collectors' plants) in contact with four different ionic liquids (ILs) suitable as diathermic fluids, were studied. Immersion tests were performed at 220 1C (the working temperature in such plants) for 10 days. The corrosion morphologies of the steels were investigated by scanning electron microscopy coupled with energy dispersive X-ray (EDX) microanalysis and the content of metals in the solution were detected via ICP-OES. The tests showed that the most performing IL is the ethyl-dimethyl-propyl-ammonium-bis(trifluoromethylsulphonyl)imide. The corrosion properties of the two alloys in contact with such IL were investigated by means of Tafel plots and resistance polarization at room temperature in open-to-air vessels. r

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Section: Forty-eight Hours Immersion Tests At 220 1csupporting

confidence: 72%

Ionic liquids as diathermic fluids for solar trough collectors’ technology: A corrosion study

Perissi

Bardi

Caporali

et al. 2008

Solar Energy Materials and Solar Cells

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“…Finally, by replacing the 3-methylimidazolium dication with the 3-benzylimidazolium dication (28)(29)(30) and connecting them by a dodecane linkage chain, the melting points appear higher compared to those of the 3-methylimidazolium series, especially in the case of the bromide salt.…”

Section: High Stability Geminal Dicationic Ionic Liquidsmentioning

confidence: 99%

Structure and Properties of High Stability Geminal Dicationic Ionic Liquids

et al. 2004

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Thirty-nine geminal dicationic ILs were synthesized and characterized in terms of their surface tensions, densities, melting points, refractive indices, viscosities, and miscibilities with a polar and nonpolar solvent. Two imidazolium or pyrrolidinium cations were joined via different length hydrocarbon linkage chains (from 3 to 12 carbons long). The various geminal dications were paired with up to four different anions. The effect of the dication type, linkage chain, alkyl substituents, and anion type on the physicochemical properties of these compounds was examined. Among the more interesting findings for this class of compounds was that their liquid and thermal stability ranges generally exceeded those of the more conventional, better known ILs. Indeed, this range was from −4 to >400 °C for one of the pyrrolidinium-based geminal dicationic liquids. Xray crystallography of the smaller solid ionic compounds indicated that there may be a correlation between the configurational degrees of freedom of the ILs and their melting points/glass transition temperatures. In one case, the crystal structure showed that a dicationic moiety had three distinct conformations in an asymmetric unit cell. The solvation properties of the geminal dicationic ILs tend to be similar to those of their monocationic analogues. KeywordsCrystal structure, glass transition, hydrocarbons, liquids, melting, negative ions, refractive index, solubility, solvents, surface tension, thermodynamic stability, viscosity, x ray crystallography, pyrrolidinium cations Abstract: Thirty-nine geminal dicationic ILs were synthesized and characterized in terms of their surface tensions, densities, melting points, refractive indices, viscosities, and miscibilities with a polar and nonpolar solvent. Two imidazolium or pyrrolidinium cations were joined via different length hydrocarbon linkage chains (from 3 to 12 carbons long). The various geminal dications were paired with up to four different anions. The effect of the dication type, linkage chain, alkyl substituents, and anion type on the physicochemical properties of these compounds was examined. Among the more interesting findings for this class of compounds was that their liquid and thermal stability ranges generally exceeded those of the more conventional, better known ILs. Indeed, this range was from -4 to >400°C for one of the pyrrolidiniumbased geminal dicationic liquids. X-ray crystallography of the smaller solid ionic compounds indicated that there may be a correlation between the configurational degrees of freedom of the ILs and their melting points/glass transition temperatures. In one case, the crystal structure showed that a dicationic moiety had three distinct conformations in an asymmetric unit cell. The solvation properties of the geminal dicationic ILs tend to be similar to those of their monocationic analogues.

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“…These observations are basically the same as those in the previous reports. 7,10,11 Figures 3 and 4 show the pyrogram of BMImCl at 550˚C by FID and its thermal decomposition pathways, respectively. Five main peaks were also observed in the pyrograms and identified to be chloromethane (4), 1-butene (5), 1-chlorobutane (6), 1-methylimidazole (a) and 1-butylimidazole (c).…”

Section: Py-gc Measuring Conditionsmentioning

confidence: 99%

“…Based on the yields of 1-methyl-and 1-ethylimidazoles, it was concluded that the less nucleophilic nature of TFSA led to much smaller yields of 1-ethylimidazole. 10 More recently, rapid thermolysis up to at 435˚C of EMIm salts with nitride, chloride and bromide anions was studied by FT-IR and time-of-flight MS measurements of the evolved species. 11 As for EMIm halides, the main products were haloalkanes and 1-methyl-and 1-ethylimidazoles.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Behaviors of Imidazolium-type Ionic Liquids Studied by Pyrolysis-Gas Chromatography

2008

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Thermal decomposition behaviors of a series of imidazolium-type ionic liquid samples were studied by pyrolysis-gas chromatography at 550˚C using various detectors. As for the imidazolium halides, haloalkanes and 1-alkylimidazoles corresponding to the alkyl substituents were mainly formed through the nucleophilic attacks of halide ions to the alkyl groups followed by C-N bond cleavage, along with a minor amount of alkenes. Meanwhile, in the case of the ionic liquids with BF4, PF6 and CF3SO3 anions, corresponding alkenes were predominantly produced along with 1-alkylimidazoles rather than haloalkanes. No boron-containing products were found even from the samples with BF4 anion, whereas minor but clear peaks of phosphorous-containing products were observed in the pyrograms of the samples with PF6 anions. As for the samples with longer alkyl group, the pyrolyzates reflecting the C-C bond scissions in the alkyl groups were also formed to some extent. Meanwhile, imidazole rings did not decompose under the experimental conditions at around 550˚C.

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Thermal Degradation of Ionic Liquids at Elevated Temperatures

Cited by 311 publications

References 0 publications

Ionic liquids as diathermic fluids for solar trough collectors’ technology: A corrosion study

Ionic liquids as diathermic fluids for solar trough collectors’ technology: A corrosion study

Structure and Properties of High Stability Geminal Dicationic Ionic Liquids

Thermal Decomposition Behaviors of Imidazolium-type Ionic Liquids Studied by Pyrolysis-Gas Chromatography

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