Karnaukhov Timofey M, Veselov Grigory B, Cherepanova Svetlana V, Vedyagin Aleksey A
Department of Materials Science and Functional Materials, Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia.
Faculty of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia.
Materials (Basel). 2022 Mar 9;15(6):2021. doi: 10.3390/ma15062021.
A sol-gel technique was applied to prepare the two-component oxide system Cu-Mg-O, where MgO plays the role of oxide matrix, and CuO is an active chemical looping component. The prepared samples were characterized by scanning electron microscopy, low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reduction behavior of the Cu-Mg-O system was examined in nine consecutive reduction/oxidation cycles. The presence of the MgO matrix was shown to affect the ability of CuO towards reduction and re-oxidation significantly. During the first reduction/oxidation cycle, the main characteristics of the oxide system (particle size, crystallization degree, etc.) undergo noticeable changes. Starting from the third cycle, the system exhibits a stable operation, providing the uptake of similar hydrogen amounts within the same temperature range. Based on the obtained results, the two-component Cu-Mg-O system can be considered as a prospective chemical looping agent.
采用溶胶-凝胶技术制备了双组分氧化物体系Cu-Mg-O，其中MgO作为氧化物基体，CuO是活性化学循环组分。通过扫描电子显微镜、低温氮吸附和X射线衍射分析对制备的样品进行了表征。在九个连续的还原/氧化循环中考察了Cu-Mg-O体系的还原行为。结果表明，MgO基体的存在显著影响CuO的还原和再氧化能力。在第一个还原/氧化循环中，氧化物体系的主要特征（粒径、结晶度等）发生了明显变化。从第三个循环开始，该体系呈现稳定运行，在相同温度范围内吸收相似量的氢气。基于所得结果，双组分Cu-Mg-O体系可被视为一种有前景的化学循环剂。
