Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China; Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, 637141, Singapore.
Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.
Chemosphere. 2020 Jun;249:126136. doi: 10.1016/j.chemosphere.2020.126136. Epub 2020 Feb 6.
The simultaneous adsorption and photocatalytic conversion of SO and NO on P25-TiO were studied. In particular, the interaction of SO and NO on each other's adsorption and photocatalytic oxidation was discussed. The adsorption of NO on P25 was negligible when comparing to that of SO, while with the coexistence of NO and SO in flue gas, both the adsorption of SO and NO were improved. In the presence of water and oxygen, the photocatalytic oxidation efficiency of NO with an efficiency of >69% was observed on irradiated TiO surface, which lasted for at least 1000 min. Oxygen was found to have much more important effect than water on the photocatalytic oxidation of NO. In the presence of SO however, the photocatalytic process of NO was largely reshaped. The whole process was controlled by the photocatalytic oxidation of SO. A dramatic efficiency decease (breakthrough of the catalyst bed) was observed for both NO and SO due to the catalyst deactivation caused by the poisoning of SO oxidation products. Before the breakthrough, the photocatalytic conversion efficiency of NO increased with increasing the SO concentration, which was mainly due to the improved NO adsorption in the presence of SO.
研究了 P25-TiO 上 SO 和 NO 的同时吸附和光催化转化。特别讨论了 SO 和 NO 之间相互吸附和光催化氧化的相互作用。与 SO 的吸附相比，NO 在 P25 上的吸附可以忽略不计，而当 NO 和 SO 共存于烟道气中时，SO 和 NO 的吸附都得到了改善。在水和氧气存在的情况下，在辐照的 TiO 表面上观察到 NO 的光催化氧化效率>69%，持续至少 1000 min。发现氧气对 NO 的光催化氧化的影响比水大得多。然而，在 SO 的存在下，NO 的光催化过程发生了很大的变化。整个过程受到 SO 光催化氧化的控制。由于 SO 氧化产物的中毒导致催化剂失活，NO 和 SO 的光催化过程都出现了效率急剧下降（催化剂床层穿透）。在穿透之前，随着 SO 浓度的增加，NO 的光催化转化率增加，这主要是由于 SO 存在时 NO 的吸附得到改善。
