Highly efficient and reversible CO2 capture through 1,1,3,3-tetramethylguanidinium imidazole ionic liquid

Densities, viscosities, and excess properties of binary mixtures of two imidazolide anion functionalized ionic liquids with water at T= (293.15 to 313.15) K

“…Moreover, when ILs were used to capture CO 2 or SO 2 from flue gas with a certain amount of water, they might absorb water from flue gas due to their hydrophilicity [17,18]. For example, the effect of moisture on CO 2 absorption of 1,1,3, 3-tetramethylguanidine imidazolide ([HTMG] [IM]) was investigated in our previous work [14], and the results showed that moisture of the CO 2 could affect the absorption of [HTMG]IM, especially at the beginning of CO 2 increasing of the moisture of CO 2 . Therefore, it is necessary to know the thermophysical properties of binary mixtures of ILs with water, such as density and viscosity, which are very important basic data for ILs during the practical application.…”

“…Anion functionalization is an important method to design and achieve the task-specific ILs. Recently, azole-based anion functionalized ILs have been widely used as the basic catalyst in the organic reaction [5][6][7], as the extraction in the separation process [8,9], and as the absorbent in the acidic gas absorption process [10][11][12][13][14][15]. For example, the imidazolide anion functionalized protic IL ([HMTBD]IM) was prepared by Wang et al through the neutralization reaction of 7-meth yl-1,5,7-triazabicyclo [4.4.0]dec-5-ene (MTBD) and imidazole to capture CO 2 , and the results showed that [HMTBD]IM was capable of rapid and reversible capture of about one equivalent of CO 2 due to the reactivity of the imidazolide anion to CO 2 [12].…”

Separation of Methane and Carbon Dioxide Gas Mixtures Using Activated Carbon Modified with 2‐Methylimidazole

“…Some researchers also studied the absorption capacity of methylimidazole [15][16][17] and the adsorption capacity of methylimidazole with porous materials [18][19][20] for the carbon dioxide molecule. The potential of methylimidazole for capturing carbon dioxide molecules was reported.…”

“…The potential of methylimidazole for capturing carbon dioxide molecules was reported. Lei et al [15] synthesized the 1,1,3,3-tetramethylguanidinium imdazole ([TMG][IM]) ionic liquid and investigated its capacity for absorption and desorption of CO 2 . Their results showed that the capture capability for CO 2 was not obviously affected by the moisture, but decreased with increasing temperature.…”

Transformation of Atmospheric CO2 Catalyzed by Protic Ionic Liquids: Efficient Synthesis of 2‐Oxazolidinones

“…Both the CO 2 and the amino group on the propargylic amine can be activated by [DBUH][MIm],s ot he mechanisms of both CO 2 -a nd amino-activated reaction pathways were investigated, respectively.Scheme S3 show clearly that there are three steps in the CO 2 -activated mechanism:CO 2 capture, [30] attack on the C C bond, and the intramolecular cyclization steps.F irst, the PIL can capture CO 2 and form the ion pair [DBUH][MIm-CO 2 ], in which CO 2 is activated by having more negative charge on the Oatoms.Inthe subsequent attack of the captured CO 2 on the C Cbond of propargylic amine,the Hatom of the cation [DBUH] + attacks the C Cb ond synchronously.T his corresponds to the transition state of TS4-5. Theenergy barrier of this step is 46.8 kcal mol À1 .I nt he last intramolecular cyclization step via transition state TS6-7, the target product is formed and the PIL [DBUH][MIm] is regenerated.…”