Sutens Ben, De Vos Yoran, Verougstraete Brieuc, Denayer Joeri F M, Rombouts Marleen
Sustainable Materials Department, Flemish Institute for Technological Research-VITO, Boeretang 200, 2400Mol, Belgium.
Department of Chemical Engineering, Vrije Universiteit Brussel, 1050Brussels, Belgium.
ACS Omega. 2023 Jan 18;8(4):4116-4126. doi: 10.1021/acsomega.2c07074. eCollection 2023 Jan 31.
Activated carbon sorbents were directly 3D-printed into highly adaptable monolithic/multi-channel systems by using potassium silicate as a low-temperature binder. By employing emerging 3D-printing technologies, monolithic structured sorbents were printed and fully characterized using N, Ar, and CO-sorption and Hg-intrusion porosimetry. The CO-capture performance and the required temperature for active-site regeneration were evaluated by thermogravimetric analysis-looping experiments. A mechanically stable activated carbon sorbent was developed with an increased carbon capture performance, even when a room-temperature regeneration by N purging was applied. Although the CO uptake slightly dropped after several cycles due to incomplete recovery at room temperature, a capacity increase of 25% was observed in comparison with the original activated carbon powder. To improve the recovery of the active sorbent, an optimization of the desorption step was performed by increasing the regeneration temperature up to 150 °C. This resulted in a CO uptake of the composite material of 0.76 mmol/g, almost tripling the working capacity of the original activated carbon powder (0.28 mmol/g). An in situ X-ray diffraction study was carried out to confirm the proposed sorption mechanism, indicating the presence of potassium bicarbonates and confirming the combination of physisorption and chemisorption in our composites. Finally, the structured adsorbent was heated homogeneously by applying a current through the monolith. These results describe the development of a new type of 3D-printed regenerable CO sorbents by using potassium silicate as a low-temperature binder, providing high mechanical strength, good chemical and thermal stability, and improving the total CO capacity. Moreover, the developed monolith is showing a homogeneous resistivity, leading to uniform Joule heating of the CO adsorbent.
通过使用硅酸钾作为低温粘合剂，将活性炭吸附剂直接3D打印成高度适应性的整体式/多通道系统。通过采用新兴的3D打印技术，打印出整体结构吸附剂，并使用N、Ar和CO吸附以及汞侵入孔隙率测定法对其进行全面表征。通过热重分析循环实验评估了CO捕获性能和活性位点再生所需的温度。开发了一种机械稳定的活性炭吸附剂，即使采用通过N吹扫进行室温再生的方式，其碳捕获性能也有所提高。尽管由于室温下的不完全恢复，经过几个循环后CO吸收量略有下降，但与原始活性炭粉末相比，观察到容量增加了25%。为了提高活性吸附剂的回收率，通过将再生温度提高到150°C对解吸步骤进行了优化。这导致复合材料的CO吸收量为0.76 mmol/g，几乎是原始活性炭粉末工作容量（0.28 mmol/g）的三倍。进行了原位X射线衍射研究以证实所提出的吸附机理，表明存在碳酸氢钾，并证实了我们复合材料中物理吸附和化学吸附的结合。最后，通过向整体施加电流使结构化吸附剂均匀受热。这些结果描述了一种新型3D打印可再生CO吸附剂的开发，该吸附剂使用硅酸钾作为低温粘合剂，具有高机械强度、良好的化学和热稳定性，并提高了总CO容量。此外，所开发的整体显示出均匀的电阻率，导致CO吸附剂的均匀焦耳热。
