Im Han-Gyu, Lee Myeung-Jin, Kim Woon-Gi, Kim Su-Jin, Jeong Bora, Ye Bora, Lee Heesoo, Kim Hong-Dae
Industrial Environment Green Deal Agency, Korea Institute of Industrial Technology, Ulsan 44413, Korea.
Department of Materials Science & Engineering, Pusan National University, Busan 46241, Korea.
Nanomaterials (Basel). 2022 Jul 6;12(14):2329. doi: 10.3390/nano12142329.
Typically, to meet emission regulations, the selective catalytic reduction of NO with NH (NH-SCR) technology cause NH emissions owing to high NH/NO ratios to meet emission regulations. In this study, V-Cu/BN-Ti was used to remove residual NO and NH. Catalysts were evaluated for selective catalytic oxidation of NH (NH-SCO) in the NH-SCR reaction at 200-300 °C. The addition of vanadium and copper increased the number of Brønsted and Lewis acid sites available for the reaction by increasing the ratio of V and forming Cu species, respectively. Furthermore, h-BN was dispersed in the catalyst to improve the content of vanadium and copper species on the surface. NH and NO conversion were 98% and 91% at 260 °C, respectively. Consequently, slipped NH (NH-Slip) emitted only 2% of the injected ammonia. Under SO conditions, based on the NH oxidation reaction, catalytic deactivation was improved by addition of h-BN. This study suggests that h-BN is a potential catalyst that can help remove residual NO and meet NH emission regulations when placed at the bottom of the SCR catalyst layer in coal-fired power plants.
通常，为满足排放法规，采用氨选择性催化还原氮氧化物（NH₃-SCR）技术时，由于为满足排放法规而采用高NH₃/NO比例，会导致氨排放。在本研究中，V-Cu/BN-Ti用于去除残余的NO和NH₃。对催化剂在200-300℃的NH₃-SCR反应中进行氨选择性催化氧化（NH₃-SCO）评估。钒和铜的添加分别通过提高V比例和形成铜物种，增加了可用于反应的布朗斯台德酸和路易斯酸位点数量。此外，h-BN分散在催化剂中以提高表面钒和铜物种的含量。在260℃时，NH₃和NO转化率分别为98%和91%。因此，逸出的氨（NH₃-Slip）仅占注入氨的2%。在SO₂条件下，基于NH₃氧化反应，通过添加h-BN改善了催化失活。本研究表明，h-BN是一种潜在的催化剂，当置于燃煤电厂SCR催化剂层底部时，有助于去除残余的NO并满足氨排放法规。
