Lee Min Seong, Kim Sun-I, Lee Myeung-Jin, Ye Bora, Kim Taehyo, Kim Hong-Dae, Lee Jung Woo, Lee Duck Hyun
Green Materials and Processes R&D Group, Korea Institute of Industrial Technology, Ulsan 44413, Korea.
Department of Materials Science & Engineering, Pusan National University, Busan 46241, Korea.
Nanomaterials (Basel). 2021 May 30;11(6):1452. doi: 10.3390/nano11061452.
In this study, we synthesized VO-WO/TiO catalysts with different crystallinities via one-sided and isotropic heating methods. We then investigated the effects of the catalysts' crystallinity on their acidity, surface species, and catalytic performance through various analysis techniques and a fixed-bed reactor experiment. The isotropic heating method produced crystalline VO and WO, increasing the availability of both Brønsted and Lewis acid sites, while the one-sided method produced amorphous VO and WO. The crystalline structure of the two species significantly enhanced NO formation, causing more rapid selective catalytic reduction (SCR) reactions and greater catalyst reducibility for NO decomposition. This improved NO removal efficiency and N selectivity for a wider temperature range of 200 °C-450 °C. Additionally, the synthesized, crystalline catalysts exhibited good resistance to SO, which is common in industrial flue gases. Through the results reported herein, this study may contribute to future studies on SCR catalysts and other catalyst systems.
在本研究中，我们通过单侧加热和各向同性加热方法合成了具有不同结晶度的VO-WO/TiO催化剂。然后，我们通过各种分析技术和固定床反应器实验，研究了催化剂结晶度对其酸度、表面物种和催化性能的影响。各向同性加热方法产生了结晶态的VO和WO，增加了布朗斯台德酸和路易斯酸位点的可用性，而单侧加热方法产生了非晶态的VO和WO。这两种物种的晶体结构显著促进了NO的形成，导致更快速的选择性催化还原（SCR）反应以及更高的NO分解催化剂还原能力。这提高了200℃至450℃更宽温度范围内的NO去除效率和N选择性。此外，合成的结晶催化剂对工业烟气中常见的SO表现出良好的抗性。通过本文报道的结果，本研究可能有助于未来对SCR催化剂和其他催化剂体系的研究。
