Imidazolium-based Ionic Liquids Impregnated in Silica and Alumina Supports for CO2 Capture

Abstract

Ionic liquids (ILs) physical immobilization in solid materials is a key strategy for developing efficient and low cost CO 2 capture processes. In this work, two porous commercial substrates with different characteristics (silica and alumina) were impregnated with ILs by physical wet method. Imidazolium based IL combined with [Br]and [Tf 2 N]anions were used in impregnation process. CO 2 sorption capacity and selectivity (CO 2 /N 2) of these materials were investigated. The best results regarding CO 2 /N 2 selectivity and CO 2 sorption were obtained with [Tf 2 N]anion. In relation to solid support, commercial alumina exhibited enhanced CO 2 uptake and higher selective capacity (CO 2 /N 2) (6.1 (± 0.1)). Combination of commercial alumina as support and 20 wt% of mbmim [Tf 2 N] resulted in higher CO 2 /N 2 selectivity of 9.5 ± 1.0. In addition, this material also showed fast sorption kinetics when compared to pure IL besides reuse capacity.

Synthetic silico-metallic mineral particles SSMMP: A new option for CO2 capture and CO2/N2 separation from post-combustion technology

“…According to literature (Bremmell and Addai-Mensah, 2005), only 10% of talc surfaces have Si-OH and Mg-OH reactive groups, present only in small amounts on the talc side surface (Claverie et al, 2018). These groups (-SiOH and -MgOH) present high affinity to CO2, so the greater amount of these groups on the SSMMP surface is responsible for the higher CO2 sorption capacity of these samples when compared to their respective synthetic talc (Rimola et al, 2013;Polesso et al, 2019). For SSMMP-IL, as seen in Table 4, the increase in the IL content caused a decrease in CO2 sorption capacity, lower for all SSMMP-IL than for SSMMP-M1 and SSMMP-M2 regardless of the analyzed equilibrium pressures.…”

“…The gas composition of the mixture at the exit of the system was measured using a gas chromatograph (GC) (Shimadzu GC-14B) equipped with a thermal conductivity detector. The samples selectivity was determined by equation 1, where XCO2 and XN2 correspond to the molar fractions of CO2 and N2 sorbed by the sample, and YCO2 and YN2 are the molar fractions of CO2 and N2 present in the gas phase, respectively (Azimi and Mirzaei, 2016;Duczinski et al, 2018;Polesso et al, 2019).…”

“…Many kinds of solid sorbents are described as efficient for CO2 capture. These include metal-organic frameworks (MOF) (Sabouni et al, 2014;Olajire, 2018;Younas et al, 2020), zeolitic imidasolate frameworks (ZIF) (Zhang et al, 2011;Kinik et al, 2016;Mohamedali et al, 2018), zeolites (Du et al, 2014;Wang et al, 2017;Nikolaidis et al, 2018;Kodasma et al, 2019), activated carbon (Chen et al, 2013;Houshmand et al, 2013), molecular basket sorbent (MBS) (Zhang et al, 2017), amine-modified solid sorbents (Chen et al, 2013;Houshmand et al, 2013;Linneen et al, 2013;Liu and Lin, 2013), aerogel based adsorbent (Kong et al, 2014), silica xerogels containing room temperature ionic liquids (RTIL) (dos , mesoporous silica (He and Seaton, 2006;Kamarudin and Alias, 2013;Wang et al, 2015;Loganathan and Ghoshal, 2017;Duczinski et al, 2018;Polesso et al, 2019;Mohamedali et al, 2020), and carbon nanotubes (Razavi et al, 2011;Chen et al, 2013;Houshmand et al, 2013;Linneen et al, 2013;Liu and Lin, 2013).…”

Cross-Linking of Polypropylene with Thiophene and Imidazole

“…Another important peak to confirm the presence of cross-linked adduct is the peak at 1186 cm −1 which corresponds to the cyclo DA adduct [ 17 , 19 , 48 ]. Moreover, the same peak can also be assigned to CH–N aliphatic stretching (υCH–N) if the cross-linked proceeds via Michael addition reaction ( Scheme 1 c) [ 49 , 50 , 51 ]. As clearly shown in Figure 3 a, a clear shoulder at 1186 cm −1 appears after annealing, especially at a temperature of 150 °C for both TG1 ( Figure 3 a) and IMG1 ( Figure 3 b).…”

State of the art of ionic liquid‐modified adsorbents forCO2capture and separation

“…The structures of anions of typical ILs in physically modified IL-based adsorbents increasing the gas liquid contact area between CO 2 and ILs further increasing the gas adsorption rate. [42][43][44][45] In general, IL-modified adsorbents have broad application prospects for CO 2 capture and separation.…”