Enhancement of CO2/N2 selectivity by hydroxyl or nitrile functionalized ionic liquid immobilized on mesoporous silica

IF 6 Q1 ENGINEERING, MULTIDISCIPLINARY

Results in Engineering Pub Date : 2025-03-13 DOI:10.1016/j.rineng.2025.104637

Mojtaba Mirzaei, Fatemeh Bahrami, Ali Sharifi, Mohamma Reza Jalali

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Abstract

Two task-specific imidazolium-based ionic liquids (ILs) with different cation alkyl chain and the same nitrate anion [NO₃] were synthesized and immobilized on mesoporous silica using a wet impregnation-vaporization method to give supported ionic liquids (SILs). The sorbents were characterized using NMR, BET, TGA, and XRD techniques. The CO₂ adsorption capacity alongwith CO₂/N₂ selectivity of the adsorbents were evaluated by the pass of dry CO₂ or N₂ under atmospheric pressure. The effect of temperature, flow rate, humidity and IL's percentage in adsorption process was studied. Among sorbents, [CNC₃mim][NO₃] and (MCM-41)-[CNC₃mim][NO₃](20) with 3.06 wt.%, and 2.21 wt.%, respectively exhibited the highest adsorption capacities. Interestingly, a higher content of IL in SILs(x) resulted in lower CO₂ adsorption capacity but increased CO₂/N₂ selectivity. The CO₂-rich sorbents were efficiently recycled within 40 min under 2 kPa at 70 °C. Recycle tests demonstrated SILs(x) samples are stable and can be used as new option in CO₂ capture processes.

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介孔二氧化硅固载羟基或腈功能化离子液体增强CO2/N2选择性

合成了两种具有不同阳离子烷基链和相同硝酸阴离子[NO3]的咪唑基离子液体（ILs），并采用湿浸渍-汽化法在介孔二氧化硅上固定化得到负载型离子液体（SILs）。采用NMR、BET、TGA、XRD等技术对吸附剂进行了表征。通过常压下干燥CO2或N2的通过，评价了吸附剂的CO2吸附能力和CO2/N2选择性。研究了温度、流量、湿度和IL含量对吸附过程的影响。在吸附剂中，[CNC3mim][NO3]和(MCM-41)-[CNC3mim][NO3]（20）的吸附量最高，分别为3.06 wt.%和2.21 wt.%。有趣的是，SILs(x)中较高的IL含量导致CO2吸附能力降低，但CO2/N2选择性增加。富co2吸附剂在70℃、2kpa条件下在40 min内有效回收。回收试验表明，SILs(x)样品是稳定的，可以作为二氧化碳捕获过程的新选择。

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