Development of the next generation materials for effective separation of gases is required to address various issues in energy and environmental applications. Ionic liquids (ILs) are among the most promising material types. To overcome the many hurdles in making a new class of materials technologically applicable, it is necessary to identify, access, and scale up a range of representative substances. In this work, CO2 reactive triazolide ILs were synthesized and characterized with the aim of developing a deeper understanding of how structural changes affect the overall properties of these substances. It was found that substituents on the anion play a crucial role in dictating the physical properties for CO2 capture. Depending upon the anion substituent, CO2 capacities between 0.07 and 0.4 mol CO2 per mol IL were observed. It was found that less sterically-hindered anions and anions containing electron donating groups were more reactive towards CO2. Detailed spectroscopic, CO2 absorption, rheological, and simulation studies were carried out to understand the nature and influence of these substituents. The effect of water content was also evaluated, and it was found that water had an unexpected impact on the properties of these materials, resulting in an increased viscosity, but little change in the CO2 reactivity.
要解决能源和环境应用中的各种问题,就必须开发有效分离气体的下一代材料。
离子液体 (IL) 是最有前途的材料类型之一。为了克服在技术上应用一类新材料的诸多障碍,有必要识别、获取和放大一系列具有代表性的物质。在这项研究中,我们合成了
二氧化碳活性三唑烷基惰性化合物并对其进行了表征,目的是深入了解结构变化如何影响这些物质的整体特性。研究发现,阴离子上的取代基在决定
二氧化碳捕获的物理性质方面起着至关重要的作用。根据阴离子取代基的不同,每摩尔 IL 的
二氧化碳捕获能力介于 0.07 至 0.4 摩尔
CO2 之间。研究发现,立体阻碍较少的阴离子和含有电子捐赠基团的阴离子对
二氧化碳的反应性更强。为了解这些取代基的性质和影响,进行了详细的光谱、
二氧化碳吸收、流变和模拟研究。此外,还评估了
水含量的影响,结果发现
水对这些材料的性质产生了意想不到的影响,导致粘度增加,但
二氧化碳反应性几乎没有变化。