Gong Shuyan, Wang Anqi, Zhang Jilai, Guan Jian, Han Ning, Chen Yunfa
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences Beijing 100190 PR China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing 100049 PR China.
RSC Adv. 2020 Jan 31;10(9):5212-5219. doi: 10.1039/c9ra09873a. eCollection 2020 Jan 29.
Nowadays, it is necessary and challenging to prepare CuO in a large scale for various applications such as catalysis due to its excellent properties. Here, gram-scale CuO with nm size is successfully prepared using a simple liquid-phase reduction method at 25 °C. The amount of NaOH is found to be the key factor to determine the particle size of CuO by modifying the complexation and reduction reactions. The obtained ultra-fine CuO exhibits high performance of >95% efficiency for removing high-concentration (3000 ppm) ozone at 25 °C and even at a high relative humidity (RH) of 90% for more than 8 h. Furthermore, the CuO nanoparticles are coated onto an aluminium honeycomb substrate to form a monolithic catalyst, which shows high ozone removal efficiency of >99% in dry air and >97% in 90% RH for >10 h at a space velocity of 8000 h. The high performance could be attributed to the enhanced release of the ozone decomposition intermediate by the small size of CuO, as verified by O temperature-programmed desorption and X-ray photoelectron spectroscopy. All these results show the industrial promise of the large scale synthesis of ultrafine CuO applicable for high-performance ozone removal.
如今，由于其优异的性能，大规模制备氧化铜以用于催化等各种应用既必要又具有挑战性。在此，采用简单的液相还原法在25℃下成功制备了克级纳米尺寸的氧化铜。发现氢氧化钠的用量是通过改变络合和还原反应来决定氧化铜粒径的关键因素。所获得的超细氧化铜在25℃下，甚至在90%的高相对湿度（RH）下超过8小时，对去除高浓度（3000 ppm）臭氧表现出>95%的高效性能。此外，将氧化铜纳米颗粒涂覆在铝蜂窝基体上形成整体式催化剂，在8000 h的空速下，该催化剂在干燥空气中显示出>99%的高臭氧去除效率，在90% RH下>10小时显示出>97%的高臭氧去除效率。高性能可归因于氧化铜小尺寸增强了臭氧分解中间体的释放，这通过氧程序升温脱附和X射线光电子能谱得到验证。所有这些结果表明了大规模合成适用于高效臭氧去除的超细氧化铜的工业前景。
