Zhang Wei, Tang Yunhao, Lu Cheng, Zou Jiyao, Ruan Min, Yin Yanshan, Qing Mengxia, Song Quanbin
School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, PR China; Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha 410114, PR China.
School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, PR China; Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha 410114, PR China.
Ultrason Sonochem. 2021 Apr;72:105466. doi: 10.1016/j.ultsonch.2021.105466. Epub 2021 Jan 11.
A series of CuCe-modified TiO-ZrO catalysts synthesized by stepwise impregnation method and ultrasonic-assisted impregnation method were investigated to research the removal of NO in the simulated flue gas. Results showed that the CuCe/TiO-ZrO catalyst prepared by ultrasonic-assisted impregnation method exhibited the superior NO conversion, in which higher than 85% NO was degraded at the temperature range of 250-400 °C and the highest NO conversion of 94% at 350 °C. It proves that ultrasonic treatment can markedly improve the performance of catalysts. The effect of ultrasonic enhancement on CuCe/TiO-ZrO was comprehensively studied through being characterized by physicochemical characterization. Results reveal that the ultrasonic cavitation effect improves the distribution of active species and the synergistic interaction between Cu with Ce components (Cu + Ce ↔ Cu + Ce) on the catalysts significantly, thus resulting in better dispersibility as well as a higher ratio of Cu and Ce of the catalysts. Moreover, it was found that the CuCe/TiO-ZrO catalyst prepared by the ultrasonic-assisted impregnation method represented a higher degree of ultrafine metal particles and evenness. The above results were described with the generalized dimension and singularity spectra in multifractal analysis and validated by the comparative test. Therefore, it can be concluded that ultrasonic treatment facilitates the particle size and distribution of active sites on the catalysts.
采用分步浸渍法和超声辅助浸渍法合成了一系列CuCe改性的TiO-ZrO催化剂，用于研究模拟烟气中NO的去除。结果表明，超声辅助浸渍法制备的CuCe/TiO-ZrO催化剂具有优异的NO转化率，在250-400℃温度范围内，高于85%的NO被降解，在350℃时NO转化率最高可达94%。这证明超声处理能显著提高催化剂的性能。通过物理化学表征对超声强化CuCe/TiO-ZrO的效果进行了全面研究。结果表明，超声空化效应显著改善了催化剂上活性物种的分布以及Cu与Ce组分之间的协同相互作用（Cu + Ce ↔ Cu⁺ + Ce⁻），从而使催化剂具有更好的分散性以及更高的Cu和Ce比例。此外，发现超声辅助浸渍法制备的CuCe/TiO-ZrO催化剂具有更高程度的超细金属颗粒和均匀性。上述结果通过多重分形分析中的广义维数和奇异性谱进行了描述，并通过对比试验进行了验证。因此，可以得出结论，超声处理有利于催化剂上活性位点的粒径和分布。
