Wick-Joliat René, Weisshar Florian B, Gorbar Michal, Meier Daniel M, Penner Dirk
IMPE Institute of Materials and Process Engineering, School of Engineering, ZHAW Zurich University of Applied Sciences, Technikumstrasse 9, 8401 Winterthur, Switzerland.
Materials (Basel). 2024 Jun 14;17(12):2913. doi: 10.3390/ma17122913.
Amines supported on porous solid materials have a high CO adsorption capacity and low regeneration temperature. However, the high amine load on such substrates and the substrate itself may lead to substantial pressure drop across the reactor. Herein, we compare the CO adsorption capacity and pressure drop of fumed silica powder to 3D-printed monolithic fumed silica structures, both functionalized by polyethylenimine (PEI), and find a drastically reduced pressure drop for 3D-printed substrates (0.01 bar vs. 0.76 bar) in the sorption bed with equal CO adsorption capacity. Furthermore, the effect of 3D-printing nozzle diameter and PEI loading on the adsorption capacity are investigated and the highest capacities (2.0 mmol/g at 25 °C with 5000 ppm CO) are achieved with 0.4 mm nozzle size and 34 wt% PEI loading. These high capacities are achieved since the 3D printing and subsequent sintering (700 °C) of monolithic samples does not compromise the surface area of the fumed silica. Finally, the comparison between 3D-printed monoliths and extruded granulate of varying diameter reveals that the ordered channel system of 3D-printed structures is superior to randomly oriented granulate in terms of CO adsorption capacity.
负载于多孔固体材料上的胺类具有较高的CO吸附容量和较低的再生温度。然而，此类载体上较高的胺负载量以及载体本身可能会导致反应器两端出现显著的压降。在此，我们比较了经聚乙烯亚胺（PEI）功能化的气相二氧化硅粉末与3D打印整体式气相二氧化硅结构的CO吸附容量和压降，发现在具有相同CO吸附容量的吸附床中，3D打印载体的压降大幅降低（0.01 bar对0.76 bar）。此外，研究了3D打印喷嘴直径和PEI负载量对吸附容量的影响，在喷嘴尺寸为0.4 mm且PEI负载量为34 wt%时实现了最高吸附容量（25 °C下5000 ppm CO时为2.0 mmol/g）。之所以能实现这些高容量，是因为整体式样品的3D打印及后续烧结（700 °C）并未损害气相二氧化硅的表面积。最后，对不同直径的3D打印整体式结构和挤出颗粒进行比较，结果表明，3D打印结构的有序通道系统在CO吸附容量方面优于随机取向的颗粒。
