Bhati Geetanjali, Dharanikota Naga Phani Sai Kumar, Uppaluri Ramagopal V S, Mandal Bishnupada
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Environ Sci Pollut Res Int. 2024 Dec;31(56):65051-65065. doi: 10.1007/s11356-024-35493-y. Epub 2024 Nov 20.
High-performing zeolite materials for carbon dioxide capture are promising for applications such as flue gas CO capture. Potassium carbonate-loaded zeolites can offer a plethora of benefits. In this work, for the first time, zeolite-Y impregnated with KCO was studied as a gas adsorbent (CO, CH, and N) and characterized using TGA (thermogravimetric analyzer), XRD, BET, FTIR, FETEM (Field-Emission Transmission Electron Microscope), and XPS. The effect of carbonate loading, temperature, and pressure was particularly targeted and assessed. Accordingly, for a variation in KCO loading from 5 to 15 wt.%, the CO adsorption capacity reduced from 3.61 to 1.73 mmol g in the synthesized adsorbents. Among all the cases, KYZC10 exhibited very good cyclic adsorption-desorption performance and thermal stability. Further equilibrium modeling studies indicate that the stable and optimally KCO-loaded adsorbent (KYZC10) demonstrates effective adsorption isotherm behavior, making it suitable for different temperature variation processes in commercial carbon dioxide capture applications. The KYZC10 adsorbent's stable performance at varying temperatures contributes to its enhanced economic feasibility. This study also used the ideal adsorbed solution theory (IAST) to predict CO selectivity over other gases (CH and N).
用于二氧化碳捕集的高性能沸石材料在烟道气二氧化碳捕集等应用中具有广阔前景。负载碳酸钾的沸石具有诸多优点。在本工作中，首次对浸渍碳酸钾的Y型沸石作为气体吸附剂（用于吸附二氧化碳、甲烷和氮气）进行了研究，并使用热重分析仪（TGA）、X射线衍射仪（XRD）、比表面积分析仪（BET）、傅里叶变换红外光谱仪（FTIR）、场发射透射电子显微镜（FETEM）和X射线光电子能谱仪（XPS）对其进行了表征。特别针对并评估了碳酸盐负载量、温度和压力的影响。因此，在合成吸附剂中，随着碳酸钾负载量从5 wt.%变化到15 wt.%，二氧化碳吸附容量从3.61 mmol/g降至1.73 mmol/g。在所有情况中，KYZC10表现出非常良好的循环吸附 - 解吸性能和热稳定性。进一步的平衡模型研究表明，稳定且负载量最佳的碳酸钾吸附剂（KYZC10）表现出有效的吸附等温线行为，使其适用于商业二氧化碳捕集应用中的不同温度变化过程。KYZC10吸附剂在不同温度下的稳定性能有助于提高其经济可行性。本研究还使用理想吸附溶液理论（IAST）预测了二氧化碳相对于其他气体（甲烷和氮气）的选择性。
