Klimek Agnieszka, Gaweł Adam, Górniak Katarzyna, Tomczyk-Chmiel Anna, Serwicka Ewa M, Bahranowski Krzysztof
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland.
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland.
Materials (Basel). 2024 Aug 14;17(16):4036. doi: 10.3390/ma17164036.
Montmorillonite is a layered clay mineral whose modification by pillaring, i.e., insertion of oxide nanoclusters between the layers, yields porous materials of great potential in sorption and catalysis. In the present study, an unrefined industrial bentonite from Kopernica (Slovakia), containing ca. 70% of montmorillonite, was used for the preparation of Ti-, Zr-, and mixed [Ti,Zr]-pillared clay sorbents. The pillared samples were characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and N adsorption at -196 °C and tested for the capacity of CO sorption at 0 °C and 1 bar pressure. The experiments revealed that pillared samples sorbed at least four times more CO than the parent bentonite. Of the materials tested, the sample pillared with mixed [Ti,Zr] oxide props showed the best performance, which was attributed to its superior microporosity. The results of CO adsorption demonstrated that the cost-effective use of crude industrial bentonite as the sorbent precursor is a viable synthesis option. In another experiment, all pillared montmorillonites were subjected to 24 h exposure at room temperature to a flow of dry CO and then tested using simultaneous thermal analysis (STA) and the mass spectrometry (MS) analysis of the evolving gases (STA/QMS). It was found that interaction with dry CO reduces the amount of bound carbon dioxide and affects the processes of dehydration, dehydroxylation, and the mode of CO binding in the pillared structure.
蒙脱石是一种层状粘土矿物，通过柱撑改性，即在层间插入氧化物纳米团簇，可得到在吸附和催化方面具有巨大潜力的多孔材料。在本研究中，使用了来自斯洛伐克科佩尔尼察的一种未精制工业膨润土（约含70%的蒙脱石）来制备钛、锆和混合[钛,锆]柱撑粘土吸附剂。对柱撑后的样品进行了X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）表征以及在-196℃下的氮气吸附，并测试了其在0℃和1巴压力下对一氧化碳的吸附能力。实验表明，柱撑后的样品对一氧化碳的吸附量至少是原始膨润土的四倍。在所测试的材料中，用混合[钛,锆]氧化物柱撑的样品表现最佳，这归因于其优异的微孔性。一氧化碳吸附实验结果表明，将粗制工业膨润土作为吸附剂前驱体进行经济高效的利用是一种可行的合成选择。在另一项实验中，所有柱撑蒙脱石在室温下暴露于干燥的一氧化碳气流中24小时，然后使用同步热分析（STA）和逸出气体的质谱（MS）分析（STA/QMS）进行测试。结果发现，与干燥一氧化碳的相互作用减少了结合二氧化碳的量，并影响了脱水、脱羟基过程以及柱撑结构中一氧化碳的结合方式。
